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70
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/* Exception observers for outcome type
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (3 commits)
File Created: Oct 2017
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_BASIC_OUTCOME_EXCEPTION_OBSERVERS_HPP
#define BOOST_OUTCOME_BASIC_OUTCOME_EXCEPTION_OBSERVERS_HPP
#include "basic_result_storage.hpp"
BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
namespace detail
{
template <class Base, class R, class S, class P, class NoValuePolicy> class basic_outcome_exception_observers : public Base
{
public:
using exception_type = P;
using Base::Base;
constexpr inline exception_type &assume_exception() & noexcept;
constexpr inline const exception_type &assume_exception() const &noexcept;
constexpr inline exception_type &&assume_exception() && noexcept;
constexpr inline const exception_type &&assume_exception() const &&noexcept;
constexpr inline exception_type &exception() &;
constexpr inline const exception_type &exception() const &;
constexpr inline exception_type &&exception() &&;
constexpr inline const exception_type &&exception() const &&;
};
// Exception observers not present
template <class Base, class R, class S, class NoValuePolicy> class basic_outcome_exception_observers<Base, R, S, void, NoValuePolicy> : public Base
{
public:
using Base::Base;
constexpr void assume_exception() const noexcept { NoValuePolicy::narrow_exception_check(this); }
constexpr void exception() const { NoValuePolicy::wide_exception_check(this); }
};
} // namespace detail
BOOST_OUTCOME_V2_NAMESPACE_END
#endif

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/* Exception observers for outcome type
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (6 commits)
File Created: Oct 2017
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_BASIC_OUTCOME_EXCEPTION_OBSERVERS_IMPL_HPP
#define BOOST_OUTCOME_BASIC_OUTCOME_EXCEPTION_OBSERVERS_IMPL_HPP
#include "basic_outcome_exception_observers.hpp"
#include "../policy/base.hpp"
BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
namespace policy
{
template <class R, class S, class P, class NoValuePolicy, class Impl> inline constexpr auto &&base::_exception(Impl &&self) noexcept
{
// Impl will be some internal implementation class which has no knowledge of the _ptr stored
// beneath it. So statically cast, preserving rvalue and constness, to the derived class.
using Outcome = BOOST_OUTCOME_V2_NAMESPACE::detail::rebind_type<basic_outcome<R, S, P, NoValuePolicy>, decltype(self)>;
#if defined(_MSC_VER) && _MSC_VER < 1920
// VS2017 tries a copy construction in the correct implementation despite that Outcome is always a rvalue or lvalue ref! :(
basic_outcome<R, S, P, NoValuePolicy> &_self = (basic_outcome<R, S, P, NoValuePolicy> &) (self); // NOLINT
#else
Outcome _self = static_cast<Outcome>(self); // NOLINT
#endif
return static_cast<Outcome>(_self)._ptr;
}
} // namespace policy
namespace detail
{
template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() & noexcept
{
NoValuePolicy::narrow_exception_check(*this);
return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
}
template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() const &noexcept
{
NoValuePolicy::narrow_exception_check(*this);
return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
}
template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() && noexcept
{
NoValuePolicy::narrow_exception_check(std::move(*this));
return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
}
template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() const &&noexcept
{
NoValuePolicy::narrow_exception_check(std::move(*this));
return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
}
template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() &
{
NoValuePolicy::wide_exception_check(*this);
return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
}
template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() const &
{
NoValuePolicy::wide_exception_check(*this);
return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
}
template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() &&
{
NoValuePolicy::wide_exception_check(std::move(*this));
return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
}
template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() const &&
{
NoValuePolicy::wide_exception_check(std::move(*this));
return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
}
} // namespace detail
BOOST_OUTCOME_V2_NAMESPACE_END
#endif

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/* Failure observers for outcome type
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (7 commits)
File Created: Oct 2017
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_BASIC_OUTCOME_FAILURE_OBSERVERS_HPP
#define BOOST_OUTCOME_BASIC_OUTCOME_FAILURE_OBSERVERS_HPP
#include "basic_result_storage.hpp"
BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
namespace detail
{
namespace adl
{
struct search_detail_adl
{
};
// Do NOT use template requirements here!
template <class S, typename = decltype(basic_outcome_failure_exception_from_error(std::declval<S>()))>
inline auto _delayed_lookup_basic_outcome_failure_exception_from_error(const S &ec, search_detail_adl /*unused*/)
{
// ADL discovered
return basic_outcome_failure_exception_from_error(ec);
}
} // namespace adl
#if defined(_MSC_VER) && _MSC_VER <= 1923 // VS2019
// VS2017 and VS2019 with /permissive- chokes on the correct form due to over eager early instantiation.
template <class S, class P> inline void _delayed_lookup_basic_outcome_failure_exception_from_error(...) { static_assert(sizeof(S) == 0, "No specialisation for these error and exception types available!"); }
#else
template <class S, class P> inline void _delayed_lookup_basic_outcome_failure_exception_from_error(...) = delete; // NOLINT No specialisation for these error and exception types available!
#endif
template <class exception_type> inline exception_type current_exception_or_fatal(std::exception_ptr e) { std::rethrow_exception(e); }
template <> inline std::exception_ptr current_exception_or_fatal<std::exception_ptr>(std::exception_ptr e) { return e; }
template <class Base, class R, class S, class P, class NoValuePolicy> class basic_outcome_failure_observers : public Base
{
public:
using exception_type = P;
using Base::Base;
exception_type failure() const noexcept
{
#ifndef BOOST_NO_EXCEPTIONS
try
#endif
{
if(this->_state._status.have_exception())
{
return this->assume_exception();
}
if(this->_state._status.have_error())
{
return _delayed_lookup_basic_outcome_failure_exception_from_error(this->assume_error(), adl::search_detail_adl());
}
return exception_type();
}
#ifndef BOOST_NO_EXCEPTIONS
catch(...)
{
// Return the failure if exception_type is std::exception_ptr,
// otherwise terminate same as throwing an exception inside noexcept
return current_exception_or_fatal<exception_type>(std::current_exception());
}
#endif
}
};
} // namespace detail
BOOST_OUTCOME_V2_NAMESPACE_END
#endif

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/* Error observers for a very simple basic_result type
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (2 commits)
File Created: Oct 2017
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_BASIC_RESULT_ERROR_OBSERVERS_HPP
#define BOOST_OUTCOME_BASIC_RESULT_ERROR_OBSERVERS_HPP
#include "basic_result_storage.hpp"
BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
namespace detail
{
template <class Base, class EC, class NoValuePolicy> class basic_result_error_observers : public Base
{
public:
using error_type = EC;
using Base::Base;
constexpr error_type &assume_error() & noexcept
{
NoValuePolicy::narrow_error_check(static_cast<basic_result_error_observers &>(*this));
return this->_error;
}
constexpr const error_type &assume_error() const &noexcept
{
NoValuePolicy::narrow_error_check(static_cast<const basic_result_error_observers &>(*this));
return this->_error;
}
constexpr error_type &&assume_error() && noexcept
{
NoValuePolicy::narrow_error_check(static_cast<basic_result_error_observers &&>(*this));
return static_cast<error_type &&>(this->_error);
}
constexpr const error_type &&assume_error() const &&noexcept
{
NoValuePolicy::narrow_error_check(static_cast<const basic_result_error_observers &&>(*this));
return static_cast<const error_type &&>(this->_error);
}
constexpr error_type &error() &
{
NoValuePolicy::wide_error_check(static_cast<basic_result_error_observers &>(*this));
return this->_error;
}
constexpr const error_type &error() const &
{
NoValuePolicy::wide_error_check(static_cast<const basic_result_error_observers &>(*this));
return this->_error;
}
constexpr error_type &&error() &&
{
NoValuePolicy::wide_error_check(static_cast<basic_result_error_observers &&>(*this));
return static_cast<error_type &&>(this->_error);
}
constexpr const error_type &&error() const &&
{
NoValuePolicy::wide_error_check(static_cast<const basic_result_error_observers &&>(*this));
return static_cast<const error_type &&>(this->_error);
}
};
template <class Base, class NoValuePolicy> class basic_result_error_observers<Base, void, NoValuePolicy> : public Base
{
public:
using Base::Base;
constexpr void assume_error() const noexcept { NoValuePolicy::narrow_error_check(*this); }
constexpr void error() const { NoValuePolicy::wide_error_check(*this); }
};
} // namespace detail
BOOST_OUTCOME_V2_NAMESPACE_END
#endif

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/* Finaliser for a very simple result type
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (5 commits)
File Created: Oct 2017
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_BASIC_RESULT_FINAL_HPP
#define BOOST_OUTCOME_BASIC_RESULT_FINAL_HPP
#include "basic_result_error_observers.hpp"
#include "basic_result_value_observers.hpp"
BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
namespace detail
{
template <class R, class EC, class NoValuePolicy> using select_basic_result_impl = basic_result_error_observers<basic_result_value_observers<basic_result_storage<R, EC, NoValuePolicy>, R, NoValuePolicy>, EC, NoValuePolicy>;
template <class R, class S, class NoValuePolicy>
class basic_result_final
#if defined(BOOST_OUTCOME_DOXYGEN_IS_IN_THE_HOUSE)
: public basic_result_error_observers<basic_result_value_observers<basic_result_storage<R, S, NoValuePolicy>, R, NoValuePolicy>, S, NoValuePolicy>
#else
: public select_basic_result_impl<R, S, NoValuePolicy>
#endif
{
using base = select_basic_result_impl<R, S, NoValuePolicy>;
public:
using base::base;
constexpr explicit operator bool() const noexcept { return this->_state._status.have_value(); }
constexpr bool has_value() const noexcept { return this->_state._status.have_value(); }
constexpr bool has_error() const noexcept { return this->_state._status.have_error(); }
constexpr bool has_exception() const noexcept { return this->_state._status.have_exception(); }
constexpr bool has_lost_consistency() const noexcept { return this->_state._status.have_lost_consistency(); }
constexpr bool has_failure() const noexcept { return this->_state._status.have_error() || this->_state._status.have_exception(); }
BOOST_OUTCOME_TEMPLATE(class T, class U, class V)
BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<detail::devoid<R>>() == std::declval<detail::devoid<T>>()), //
BOOST_OUTCOME_TEXPR(std::declval<detail::devoid<S>>() == std::declval<detail::devoid<U>>()))
constexpr bool operator==(const basic_result_final<T, U, V> &o) const noexcept( //
noexcept(std::declval<detail::devoid<R>>() == std::declval<detail::devoid<T>>()) && noexcept(std::declval<detail::devoid<S>>() == std::declval<detail::devoid<U>>()))
{
if(this->_state._status.have_value() && o._state._status.have_value())
{
return this->_state._value == o._state._value; // NOLINT
}
if(this->_state._status.have_error() && o._state._status.have_error())
{
return this->_error == o._error;
}
return false;
}
BOOST_OUTCOME_TEMPLATE(class T)
BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<R>() == std::declval<T>()))
constexpr bool operator==(const success_type<T> &o) const noexcept( //
noexcept(std::declval<R>() == std::declval<T>()))
{
if(this->_state._status.have_value())
{
return this->_state._value == o.value();
}
return false;
}
constexpr bool operator==(const success_type<void> &o) const noexcept
{
(void) o;
return this->_state._status.have_value();
}
BOOST_OUTCOME_TEMPLATE(class T)
BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<S>() == std::declval<T>()))
constexpr bool operator==(const failure_type<T, void> &o) const noexcept( //
noexcept(std::declval<S>() == std::declval<T>()))
{
if(this->_state._status.have_error())
{
return this->_error == o.error();
}
return false;
}
BOOST_OUTCOME_TEMPLATE(class T, class U, class V)
BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<detail::devoid<R>>() != std::declval<detail::devoid<T>>()), //
BOOST_OUTCOME_TEXPR(std::declval<detail::devoid<S>>() != std::declval<detail::devoid<U>>()))
constexpr bool operator!=(const basic_result_final<T, U, V> &o) const noexcept( //
noexcept(std::declval<detail::devoid<R>>() != std::declval<detail::devoid<T>>()) && noexcept(std::declval<detail::devoid<S>>() != std::declval<detail::devoid<U>>()))
{
if(this->_state._status.have_value() && o._state._status.have_value())
{
return this->_state._value != o._state._value;
}
if(this->_state._status.have_error() && o._state._status.have_error())
{
return this->_error != o._error;
}
return true;
}
BOOST_OUTCOME_TEMPLATE(class T)
BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<R>() != std::declval<T>()))
constexpr bool operator!=(const success_type<T> &o) const noexcept( //
noexcept(std::declval<R>() != std::declval<T>()))
{
if(this->_state._status.have_value())
{
return this->_state._value != o.value();
}
return false;
}
constexpr bool operator!=(const success_type<void> &o) const noexcept
{
(void) o;
return !this->_state._status.have_value();
}
BOOST_OUTCOME_TEMPLATE(class T)
BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<S>() != std::declval<T>()))
constexpr bool operator!=(const failure_type<T, void> &o) const noexcept( //
noexcept(std::declval<S>() != std::declval<T>()))
{
if(this->_state._status.have_error())
{
return this->_error != o.error();
}
return true;
}
};
template <class T, class U, class V, class W> constexpr inline bool operator==(const success_type<W> &a, const basic_result_final<T, U, V> &b) noexcept(noexcept(b == a)) { return b == a; }
template <class T, class U, class V, class W> constexpr inline bool operator==(const failure_type<W, void> &a, const basic_result_final<T, U, V> &b) noexcept(noexcept(b == a)) { return b == a; }
template <class T, class U, class V, class W> constexpr inline bool operator!=(const success_type<W> &a, const basic_result_final<T, U, V> &b) noexcept(noexcept(b == a)) { return b != a; }
template <class T, class U, class V, class W> constexpr inline bool operator!=(const failure_type<W, void> &a, const basic_result_final<T, U, V> &b) noexcept(noexcept(b == a)) { return b != a; }
} // namespace detail
BOOST_OUTCOME_V2_NAMESPACE_END
#endif

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/* Storage for a very simple basic_result type
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (6 commits)
File Created: Oct 2017
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_BASIC_RESULT_STORAGE_HPP
#define BOOST_OUTCOME_BASIC_RESULT_STORAGE_HPP
#include "../success_failure.hpp"
#include "../trait.hpp"
#include "value_storage.hpp"
BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
namespace detail
{
template <class State, class E> constexpr inline void _set_error_is_errno(State & /*unused*/, const E & /*unused*/) {}
template <class R, class EC, class NoValuePolicy> class basic_result_storage;
} // namespace detail
namespace hooks
{
template <class R, class S, class NoValuePolicy> constexpr inline uint16_t spare_storage(const detail::basic_result_storage<R, S, NoValuePolicy> *r) noexcept;
template <class R, class S, class NoValuePolicy>
constexpr inline void set_spare_storage(detail::basic_result_storage<R, S, NoValuePolicy> *r, uint16_t v) noexcept;
} // namespace hooks
namespace policy
{
struct base;
} // namespace policy
namespace detail
{
template <bool value_throws, bool error_throws> struct basic_result_storage_swap;
template <class R, class EC, class NoValuePolicy> //
class basic_result_storage
{
static_assert(trait::type_can_be_used_in_basic_result<R>, "The type R cannot be used in a basic_result");
static_assert(trait::type_can_be_used_in_basic_result<EC>, "The type S cannot be used in a basic_result");
static_assert(std::is_void<EC>::value || std::is_default_constructible<EC>::value, "The type S must be void or default constructible");
friend struct policy::base;
template <class T, class U, class V> //
friend class basic_result_storage;
template <class T, class U, class V> friend class basic_result_final;
template <class T, class U, class V>
friend constexpr inline uint16_t hooks::spare_storage(const detail::basic_result_storage<T, U, V> *r) noexcept; // NOLINT
template <class T, class U, class V>
friend constexpr inline void hooks::set_spare_storage(detail::basic_result_storage<T, U, V> *r, uint16_t v) noexcept; // NOLINT
template <bool value_throws, bool error_throws> struct basic_result_storage_swap;
struct disable_in_place_value_type
{
};
struct disable_in_place_error_type
{
};
protected:
using _value_type = std::conditional_t<std::is_same<R, EC>::value, disable_in_place_value_type, R>;
using _error_type = std::conditional_t<std::is_same<R, EC>::value, disable_in_place_error_type, EC>;
using _state_type = value_storage_select_impl<_value_type>;
#ifdef BOOST_OUTCOME_STANDARDESE_IS_IN_THE_HOUSE
detail::value_storage_trivial<_value_type> _state;
#else
_state_type _state;
#endif
devoid<_error_type> _error;
public:
// Used by iostream support to access state
_state_type &_iostreams_state() { return _state; }
const _state_type &_iostreams_state() const { return _state; }
// Hack to work around MSVC bug in /permissive-
_state_type &_msvc_nonpermissive_state() { return _state; }
devoid<_error_type> &_msvc_nonpermissive_error() { return _error; }
protected:
basic_result_storage() = default;
basic_result_storage(const basic_result_storage &) = default; // NOLINT
basic_result_storage(basic_result_storage &&) = default; // NOLINT
basic_result_storage &operator=(const basic_result_storage &) = default; // NOLINT
basic_result_storage &operator=(basic_result_storage &&) = default; // NOLINT
~basic_result_storage() = default;
template <class... Args>
constexpr explicit basic_result_storage(in_place_type_t<_value_type> _,
Args &&... args) noexcept(detail::is_nothrow_constructible<_value_type, Args...>)
: _state{_, static_cast<Args &&>(args)...}
, _error()
{
}
template <class U, class... Args>
constexpr basic_result_storage(in_place_type_t<_value_type> _, std::initializer_list<U> il,
Args &&... args) noexcept(detail::is_nothrow_constructible<_value_type, std::initializer_list<U>, Args...>)
: _state{_, il, static_cast<Args &&>(args)...}
, _error()
{
}
template <class... Args>
constexpr explicit basic_result_storage(in_place_type_t<_error_type> /*unused*/, Args &&... args) noexcept(detail::is_nothrow_constructible<_error_type, Args...>)
: _state{detail::status::have_error}
, _error(static_cast<Args &&>(args)...)
{
_set_error_is_errno(_state, _error);
}
template <class U, class... Args>
constexpr basic_result_storage(in_place_type_t<_error_type> /*unused*/, std::initializer_list<U> il, Args &&... args) noexcept(detail::is_nothrow_constructible<_error_type, std::initializer_list<U>, Args...>)
: _state{detail::status::have_error}
, _error{il, static_cast<Args &&>(args)...}
{
_set_error_is_errno(_state, _error);
}
struct compatible_conversion_tag
{
};
template <class T, class U, class V>
constexpr basic_result_storage(compatible_conversion_tag /*unused*/, const basic_result_storage<T, U, V> &o) noexcept(detail::is_nothrow_constructible<_value_type, T> &&detail::is_nothrow_constructible<_error_type, U>)
: _state(o._state)
, _error(o._error)
{
}
template <class T, class V>
constexpr basic_result_storage(compatible_conversion_tag /*unused*/, const basic_result_storage<T, void, V> &o) noexcept(detail::is_nothrow_constructible<_value_type, T>)
: _state(o._state)
, _error(_error_type{})
{
}
template <class T, class U, class V>
constexpr basic_result_storage(compatible_conversion_tag /*unused*/, basic_result_storage<T, U, V> &&o) noexcept(detail::is_nothrow_constructible<_value_type, T> &&detail::is_nothrow_constructible<_error_type, U>)
: _state(static_cast<decltype(o._state) &&>(o._state))
, _error(static_cast<U &&>(o._error))
{
}
template <class T, class V>
constexpr basic_result_storage(compatible_conversion_tag /*unused*/, basic_result_storage<T, void, V> &&o) noexcept(detail::is_nothrow_constructible<_value_type, T>)
: _state(static_cast<decltype(o._state) &&>(o._state))
, _error(_error_type{})
{
}
struct make_error_code_compatible_conversion_tag
{
};
template <class T, class U, class V>
constexpr basic_result_storage(make_error_code_compatible_conversion_tag /*unused*/, const basic_result_storage<T, U, V> &o) noexcept(detail::is_nothrow_constructible<_value_type, T> &&noexcept(make_error_code(std::declval<U>())))
: _state(o._state)
, _error(make_error_code(o._error))
{
}
template <class T, class U, class V>
constexpr basic_result_storage(make_error_code_compatible_conversion_tag /*unused*/, basic_result_storage<T, U, V> &&o) noexcept(detail::is_nothrow_constructible<_value_type, T> &&noexcept(make_error_code(std::declval<U>())))
: _state(static_cast<decltype(o._state) &&>(o._state))
, _error(make_error_code(static_cast<U &&>(o._error)))
{
}
struct make_exception_ptr_compatible_conversion_tag
{
};
template <class T, class U, class V>
constexpr basic_result_storage(make_exception_ptr_compatible_conversion_tag /*unused*/, const basic_result_storage<T, U, V> &o) noexcept(detail::is_nothrow_constructible<_value_type, T> &&noexcept(make_exception_ptr(std::declval<U>())))
: _state(o._state)
, _error(make_exception_ptr(o._error))
{
}
template <class T, class U, class V>
constexpr basic_result_storage(make_exception_ptr_compatible_conversion_tag /*unused*/, basic_result_storage<T, U, V> &&o) noexcept(detail::is_nothrow_constructible<_value_type, T> &&noexcept(make_exception_ptr(std::declval<U>())))
: _state(static_cast<decltype(o._state) &&>(o._state))
, _error(make_exception_ptr(static_cast<U &&>(o._error)))
{
}
};
// Neither value nor error type can throw during swap
#ifndef BOOST_NO_EXCEPTIONS
template <> struct basic_result_storage_swap<false, false>
#else
template <bool value_throws, bool error_throws> struct basic_result_storage_swap
#endif
{
template <class R, class EC, class NoValuePolicy> constexpr basic_result_storage_swap(basic_result_storage<R, EC, NoValuePolicy> &a, basic_result_storage<R, EC, NoValuePolicy> &b)
{
using std::swap;
a._msvc_nonpermissive_state().swap(b._msvc_nonpermissive_state());
swap(a._msvc_nonpermissive_error(), b._msvc_nonpermissive_error());
}
};
#ifndef BOOST_NO_EXCEPTIONS
// Swap potentially throwing value first
template <> struct basic_result_storage_swap<true, false>
{
template <class R, class EC, class NoValuePolicy> constexpr basic_result_storage_swap(basic_result_storage<R, EC, NoValuePolicy> &a, basic_result_storage<R, EC, NoValuePolicy> &b)
{
using std::swap;
a._msvc_nonpermissive_state().swap(b._msvc_nonpermissive_state());
swap(a._msvc_nonpermissive_error(), b._msvc_nonpermissive_error());
}
};
// Swap potentially throwing error first
template <> struct basic_result_storage_swap<false, true>
{
template <class R, class EC, class NoValuePolicy> constexpr basic_result_storage_swap(basic_result_storage<R, EC, NoValuePolicy> &a, basic_result_storage<R, EC, NoValuePolicy> &b)
{
struct _
{
status_bitfield_type &a, &b;
bool all_good{false};
~_()
{
if(!all_good)
{
// We lost one of the values
a.set_have_lost_consistency(true);
b.set_have_lost_consistency(true);
}
}
} _{a._msvc_nonpermissive_state()._status, b._msvc_nonpermissive_state()._status};
strong_swap(_.all_good, a._msvc_nonpermissive_error(), b._msvc_nonpermissive_error());
a._msvc_nonpermissive_state().swap(b._msvc_nonpermissive_state());
}
};
// Both could throw
template <> struct basic_result_storage_swap<true, true>
{
template <class R, class EC, class NoValuePolicy> basic_result_storage_swap(basic_result_storage<R, EC, NoValuePolicy> &a, basic_result_storage<R, EC, NoValuePolicy> &b)
{
using std::swap;
// Swap value and status first, if it throws, status will remain unchanged
a._msvc_nonpermissive_state().swap(b._msvc_nonpermissive_state());
bool all_good = false;
try
{
strong_swap(all_good, a._msvc_nonpermissive_error(), b._msvc_nonpermissive_error());
}
catch(...)
{
if(!all_good)
{
a._msvc_nonpermissive_state()._status.set_have_lost_consistency(true);
b._msvc_nonpermissive_state()._status.set_have_lost_consistency(true);
}
else
{
// We may still be able to rescue tis
// First try to put the value and status back
try
{
a._msvc_nonpermissive_state().swap(b._msvc_nonpermissive_state());
// If that succeeded, continue by rethrowing the exception
}
catch(...)
{
all_good = false;
}
}
if(!all_good)
{
// We are now trapped. The value swapped, the error did not,
// trying to restore the value failed. We now have
// inconsistent result objects. Best we can do is fix up the
// status bits to prevent has_value() == has_error().
auto check = [](basic_result_storage<R, EC, NoValuePolicy> &x) {
bool has_value = x._state._status.have_value();
bool has_error = x._state._status.have_error();
bool has_exception = x._state._status.have_exception();
x._state._status.set_have_lost_consistency(true);
if(has_value == (has_error || has_exception))
{
if(has_value)
{
// We know the value swapped and is now set, so clear error and exception
x._state._status.set_have_error(false).set_have_exception(false);
}
else
{
// We know the value swapped and is now unset, so set error
x._state._status.set_have_error(true);
// TODO: Should I default construct reset _error? It's guaranteed default constructible.
}
}
};
check(a);
check(b);
}
throw;
}
}
};
#endif
} // namespace detail
BOOST_OUTCOME_V2_NAMESPACE_END
#endif

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/* Value observers for a very simple basic_result type
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (2 commits)
File Created: Oct 2017
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_RESULT_VALUE_OBSERVERS_HPP
#define BOOST_OUTCOME_RESULT_VALUE_OBSERVERS_HPP
#include "basic_result_storage.hpp"
BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
namespace detail
{
template <class Base, class R, class NoValuePolicy> class basic_result_value_observers : public Base
{
public:
using value_type = R;
using Base::Base;
constexpr value_type &assume_value() & noexcept
{
NoValuePolicy::narrow_value_check(static_cast<basic_result_value_observers &>(*this));
return this->_state._value; // NOLINT
}
constexpr const value_type &assume_value() const &noexcept
{
NoValuePolicy::narrow_value_check(static_cast<const basic_result_value_observers &>(*this));
return this->_state._value; // NOLINT
}
constexpr value_type &&assume_value() && noexcept
{
NoValuePolicy::narrow_value_check(static_cast<basic_result_value_observers &&>(*this));
return static_cast<value_type &&>(this->_state._value); // NOLINT
}
constexpr const value_type &&assume_value() const &&noexcept
{
NoValuePolicy::narrow_value_check(static_cast<const basic_result_value_observers &&>(*this));
return static_cast<const value_type &&>(this->_state._value); // NOLINT
}
constexpr value_type &value() &
{
NoValuePolicy::wide_value_check(static_cast<basic_result_value_observers &>(*this));
return this->_state._value; // NOLINT
}
constexpr const value_type &value() const &
{
NoValuePolicy::wide_value_check(static_cast<const basic_result_value_observers &>(*this));
return this->_state._value; // NOLINT
}
constexpr value_type &&value() &&
{
NoValuePolicy::wide_value_check(static_cast<basic_result_value_observers &&>(*this));
return static_cast<value_type &&>(this->_state._value); // NOLINT
}
constexpr const value_type &&value() const &&
{
NoValuePolicy::wide_value_check(static_cast<const basic_result_value_observers &&>(*this));
return static_cast<const value_type &&>(this->_state._value); // NOLINT
}
};
template <class Base, class NoValuePolicy> class basic_result_value_observers<Base, void, NoValuePolicy> : public Base
{
public:
using Base::Base;
constexpr void assume_value() const noexcept { NoValuePolicy::narrow_value_check(*this); }
constexpr void value() const { NoValuePolicy::wide_value_check(*this); }
};
} // namespace detail
BOOST_OUTCOME_V2_NAMESPACE_END
#endif

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/* Tells C++ coroutines about Outcome's result
(C) 2019-2020 Niall Douglas <http://www.nedproductions.biz/> (12 commits)
File Created: Oct 2019
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_COROUTINE_SUPPORT_NAMESPACE_BEGIN
#error This header must only be included by outcome/coroutine_support.hpp or outcome/experimental/coroutine_support.hpp
#endif
#ifndef BOOST_OUTCOME_DETAIL_COROUTINE_SUPPORT_HPP
#define BOOST_OUTCOME_DETAIL_COROUTINE_SUPPORT_HPP
#include <atomic>
#include <cassert>
#if __cpp_impl_coroutine || (defined(_MSC_VER) && __cpp_coroutines) || (defined(__clang__) && __cpp_coroutines)
#ifndef BOOST_OUTCOME_HAVE_NOOP_COROUTINE
#if defined(__has_builtin)
#if __has_builtin(__builtin_coro_noop)
#define BOOST_OUTCOME_HAVE_NOOP_COROUTINE 1
#endif
#endif
#endif
#ifndef BOOST_OUTCOME_HAVE_NOOP_COROUTINE
#if _MSC_VER >= 1928
#define BOOST_OUTCOME_HAVE_NOOP_COROUTINE 1
#else
#define BOOST_OUTCOME_HAVE_NOOP_COROUTINE 0
#endif
#endif
#if __has_include(<coroutine>)
#include <coroutine>
BOOST_OUTCOME_V2_NAMESPACE_BEGIN
namespace awaitables
{
template <class Promise = void> using coroutine_handle = std::coroutine_handle<Promise>;
template <class... Args> using coroutine_traits = std::coroutine_traits<Args...>;
using std::suspend_always;
using std::suspend_never;
#if BOOST_OUTCOME_HAVE_NOOP_COROUTINE
using std::noop_coroutine;
#endif
} // namespace awaitables
BOOST_OUTCOME_V2_NAMESPACE_END
#define BOOST_OUTCOME_FOUND_COROUTINE_HEADER 1
#elif __has_include(<experimental/coroutine>)
#include <experimental/coroutine>
BOOST_OUTCOME_V2_NAMESPACE_BEGIN
namespace awaitables
{
template <class Promise = void> using coroutine_handle = std::experimental::coroutine_handle<Promise>;
template <class... Args> using coroutine_traits = std::experimental::coroutine_traits<Args...>;
using std::experimental::suspend_always;
using std::experimental::suspend_never;
#if BOOST_OUTCOME_HAVE_NOOP_COROUTINE
using std::experimental::noop_coroutine;
#endif
} // namespace awaitables
BOOST_OUTCOME_V2_NAMESPACE_END
#define BOOST_OUTCOME_FOUND_COROUTINE_HEADER 1
#endif
#endif
BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
namespace awaitables
{
namespace detail
{
struct error_type_not_found
{
};
struct exception_type_not_found
{
};
template <class T> struct type_found
{
using type = T;
};
template <class T, class U = typename T::error_type> constexpr inline type_found<U> extract_error_type(int /*unused*/) { return {}; }
template <class T> constexpr inline type_found<error_type_not_found> extract_error_type(...) { return {}; }
template <class T, class U = typename T::exception_type> constexpr inline type_found<U> extract_exception_type(int /*unused*/) { return {}; }
template <class T> constexpr inline type_found<exception_type_not_found> extract_exception_type(...) { return {}; }
BOOST_OUTCOME_TEMPLATE(class T, class U)
BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TPRED(BOOST_OUTCOME_V2_NAMESPACE::detail::is_constructible<U, T>))
inline bool try_set_error(T &&e, U *result)
{
new(result) U(static_cast<T &&>(e));
return true;
}
template <class T> inline bool try_set_error(T && /*unused*/, ...) { return false; }
BOOST_OUTCOME_TEMPLATE(class T, class U)
BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TPRED(BOOST_OUTCOME_V2_NAMESPACE::detail::is_constructible<U, T>))
inline void set_or_rethrow(T &e, U *result) { new(result) U(e); }
template <class T> inline void set_or_rethrow(T &e, ...) { rethrow_exception(e); }
template <class T> class fake_atomic
{
T _v;
public:
constexpr fake_atomic(T v)
: _v(v)
{
}
T load(std::memory_order /*unused*/) { return _v; }
void store(T v, std::memory_order /*unused*/) { _v = v; }
};
#ifdef BOOST_OUTCOME_FOUND_COROUTINE_HEADER
template <class Awaitable, bool suspend_initial, bool use_atomic, bool is_void> struct outcome_promise_type
{
using container_type = typename Awaitable::container_type;
using result_set_type = std::conditional_t<use_atomic, std::atomic<bool>, fake_atomic<bool>>;
union
{
BOOST_OUTCOME_V2_NAMESPACE::detail::empty_type _default{};
container_type result;
};
result_set_type result_set{false};
coroutine_handle<> continuation;
outcome_promise_type() noexcept {}
outcome_promise_type(const outcome_promise_type &) = delete;
outcome_promise_type(outcome_promise_type &&) = delete;
outcome_promise_type &operator=(const outcome_promise_type &) = delete;
outcome_promise_type &operator=(outcome_promise_type &&) = delete;
~outcome_promise_type()
{
if(result_set.load(std::memory_order_acquire))
{
result.~container_type(); // could throw
}
}
auto get_return_object()
{
return Awaitable{*this}; // could throw bad_alloc
}
void return_value(container_type &&value)
{
assert(!result_set.load(std::memory_order_acquire));
if(result_set.load(std::memory_order_acquire))
{
result.~container_type(); // could throw
}
new(&result) container_type(static_cast<container_type &&>(value)); // could throw
result_set.store(true, std::memory_order_release);
}
void return_value(const container_type &value)
{
assert(!result_set.load(std::memory_order_acquire));
if(result_set.load(std::memory_order_acquire))
{
result.~container_type(); // could throw
}
new(&result) container_type(value); // could throw
result_set.store(true, std::memory_order_release);
}
void unhandled_exception()
{
assert(!result_set.load(std::memory_order_acquire));
if(result_set.load(std::memory_order_acquire))
{
result.~container_type();
}
#ifndef BOOST_NO_EXCEPTIONS
auto e = std::current_exception();
auto ec = detail::error_from_exception(static_cast<decltype(e) &&>(e), {});
// Try to set error code first
if(!detail::error_is_set(ec) || !detail::try_set_error(static_cast<decltype(ec) &&>(ec), &result))
{
detail::set_or_rethrow(e, &result); // could throw
}
#else
std::terminate();
#endif
result_set.store(true, std::memory_order_release);
}
auto initial_suspend() noexcept
{
struct awaiter
{
bool await_ready() noexcept { return !suspend_initial; }
void await_resume() noexcept {}
void await_suspend(coroutine_handle<> /*unused*/) noexcept {}
};
return awaiter{};
}
auto final_suspend() noexcept
{
struct awaiter
{
bool await_ready() noexcept { return false; }
void await_resume() noexcept {}
#if BOOST_OUTCOME_HAVE_NOOP_COROUTINE
coroutine_handle<> await_suspend(coroutine_handle<outcome_promise_type> self) noexcept
{
return self.promise().continuation ? self.promise().continuation : noop_coroutine();
}
#else
void await_suspend(coroutine_handle<outcome_promise_type> self)
{
if(self.promise().continuation)
{
return self.promise().continuation.resume();
}
}
#endif
};
return awaiter{};
}
};
template <class Awaitable, bool suspend_initial, bool use_atomic> struct outcome_promise_type<Awaitable, suspend_initial, use_atomic, true>
{
using container_type = void;
using result_set_type = std::conditional_t<use_atomic, std::atomic<bool>, fake_atomic<bool>>;
result_set_type result_set{false};
coroutine_handle<> continuation;
outcome_promise_type() {}
outcome_promise_type(const outcome_promise_type &) = delete;
outcome_promise_type(outcome_promise_type &&) = delete;
outcome_promise_type &operator=(const outcome_promise_type &) = delete;
outcome_promise_type &operator=(outcome_promise_type &&) = delete;
~outcome_promise_type() = default;
auto get_return_object()
{
return Awaitable{*this}; // could throw bad_alloc
}
void return_void() noexcept
{
assert(!result_set.load(std::memory_order_acquire));
result_set.store(true, std::memory_order_release);
}
void unhandled_exception()
{
assert(!result_set.load(std::memory_order_acquire));
std::rethrow_exception(std::current_exception()); // throws
}
auto initial_suspend() noexcept
{
struct awaiter
{
bool await_ready() noexcept { return !suspend_initial; }
void await_resume() noexcept {}
void await_suspend(coroutine_handle<> /*unused*/) noexcept {}
};
return awaiter{};
}
auto final_suspend() noexcept
{
struct awaiter
{
bool await_ready() noexcept { return false; }
void await_resume() noexcept {}
#if BOOST_OUTCOME_HAVE_NOOP_COROUTINE
coroutine_handle<> await_suspend(coroutine_handle<outcome_promise_type> self) noexcept
{
return self.promise().continuation ? self.promise().continuation : noop_coroutine();
}
#else
void await_suspend(coroutine_handle<outcome_promise_type> self)
{
if(self.promise().continuation)
{
return self.promise().continuation.resume();
}
}
#endif
};
return awaiter{};
}
};
template <class Awaitable, bool suspend_initial, bool use_atomic>
constexpr inline auto move_result_from_promise_if_not_void(outcome_promise_type<Awaitable, suspend_initial, use_atomic, false> &p)
{
return static_cast<typename Awaitable::container_type &&>(p.result);
}
template <class Awaitable, bool suspend_initial, bool use_atomic>
constexpr inline void move_result_from_promise_if_not_void(outcome_promise_type<Awaitable, suspend_initial, use_atomic, true> & /*unused*/)
{
}
template <class Cont, bool suspend_initial, bool use_atomic> struct BOOST_OUTCOME_NODISCARD awaitable
{
using container_type = Cont;
using promise_type = outcome_promise_type<awaitable, suspend_initial, use_atomic, std::is_void<container_type>::value>;
coroutine_handle<promise_type> _h;
awaitable(awaitable &&o) noexcept
: _h(static_cast<coroutine_handle<promise_type> &&>(o._h))
{
o._h = nullptr;
}
awaitable(const awaitable &o) = delete;
awaitable &operator=(awaitable &&) = delete; // as per P1056
awaitable &operator=(const awaitable &) = delete;
~awaitable()
{
if(_h)
{
_h.destroy();
}
}
explicit awaitable(promise_type &p) // could throw
: _h(coroutine_handle<promise_type>::from_promise(p))
{
}
bool await_ready() noexcept { return _h.promise().result_set.load(std::memory_order_acquire); }
container_type await_resume()
{
assert(_h.promise().result_set.load(std::memory_order_acquire));
if(!_h.promise().result_set.load(std::memory_order_acquire))
{
std::terminate();
}
return detail::move_result_from_promise_if_not_void(_h.promise());
}
#if BOOST_OUTCOME_HAVE_NOOP_COROUTINE
coroutine_handle<> await_suspend(coroutine_handle<> cont) noexcept
{
_h.promise().continuation = cont;
return _h;
}
#else
void await_suspend(coroutine_handle<> cont)
{
_h.promise().continuation = cont;
_h.resume();
}
#endif
};
#endif
} // namespace detail
} // namespace awaitables
BOOST_OUTCOME_V2_NAMESPACE_END
#endif
#ifdef BOOST_OUTCOME_FOUND_COROUTINE_HEADER
BOOST_OUTCOME_COROUTINE_SUPPORT_NAMESPACE_EXPORT_BEGIN
/*! AWAITING HUGO JSON CONVERSION TOOL
SIGNATURE NOT RECOGNISED
*/
template <class T> using eager = BOOST_OUTCOME_V2_NAMESPACE::awaitables::detail::awaitable<T, false, false>;
/*! AWAITING HUGO JSON CONVERSION TOOL
SIGNATURE NOT RECOGNISED
*/
template <class T> using atomic_eager = BOOST_OUTCOME_V2_NAMESPACE::awaitables::detail::awaitable<T, false, true>;
/*! AWAITING HUGO JSON CONVERSION TOOL
SIGNATURE NOT RECOGNISED
*/
template <class T> using lazy = BOOST_OUTCOME_V2_NAMESPACE::awaitables::detail::awaitable<T, true, false>;
/*! AWAITING HUGO JSON CONVERSION TOOL
SIGNATURE NOT RECOGNISED
*/
template <class T> using atomic_lazy = BOOST_OUTCOME_V2_NAMESPACE::awaitables::detail::awaitable<T, true, true>;
BOOST_OUTCOME_COROUTINE_SUPPORT_NAMESPACE_END
#endif

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/* UPDATED BY SCRIPT
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (225 commits)
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
// Note the second line of this file must ALWAYS be the git SHA, third line ALWAYS the git SHA update time
#define BOOST_OUTCOME_PREVIOUS_COMMIT_REF a853fc09bb9590204a33c62bd3fd32f9b212c69f
#define BOOST_OUTCOME_PREVIOUS_COMMIT_DATE "2020-10-09 09:46:07 +00:00"
#define BOOST_OUTCOME_PREVIOUS_COMMIT_UNIQUE a853fc09

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/* Traits for Outcome
(C) 2018-2020 Niall Douglas <http://www.nedproductions.biz/> (6 commits)
File Created: March 2018
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_TRAIT_STD_ERROR_CODE_HPP
#define BOOST_OUTCOME_TRAIT_STD_ERROR_CODE_HPP
#include "../config.hpp"
#include <system_error>
BOOST_OUTCOME_V2_NAMESPACE_BEGIN
namespace detail
{
// Customise _set_error_is_errno
template <class State> constexpr inline void _set_error_is_errno(State &state, const std::error_code &error)
{
if(error.category() == std::generic_category()
#ifndef _WIN32
|| error.category() == std::system_category()
#endif
)
{
state._status.set_have_error_is_errno(true);
}
}
template <class State> constexpr inline void _set_error_is_errno(State &state, const std::error_condition &error)
{
if(error.category() == std::generic_category()
#ifndef _WIN32
|| error.category() == std::system_category()
#endif
)
{
state._status.set_have_error_is_errno(true);
}
}
template <class State> constexpr inline void _set_error_is_errno(State &state, const std::errc & /*unused*/) {
state._status.set_have_error_is_errno(true);
}
} // namespace detail
namespace policy
{
namespace detail
{
/* Pass through `make_error_code` function for `std::error_code`.
*/
inline std::error_code make_error_code(std::error_code v) { return v; }
// Try ADL, if not use fall backs above
template <class T> constexpr inline decltype(auto) error_code(T &&v) { return make_error_code(std::forward<T>(v)); }
struct std_enum_overload_tag
{
};
} // namespace detail
/*! AWAITING HUGO JSON CONVERSION TOOL
SIGNATURE NOT RECOGNISED
*/
template <class T> constexpr inline decltype(auto) error_code(T &&v) { return detail::error_code(std::forward<T>(v)); }
/*! AWAITING HUGO JSON CONVERSION TOOL
SIGNATURE NOT RECOGNISED
*/
// inline void outcome_throw_as_system_error_with_payload(...) = delete; // To use the error_code_throw_as_system_error policy with a custom Error type, you must define a outcome_throw_as_system_error_with_payload() free function to say how to handle the payload
inline void outcome_throw_as_system_error_with_payload(const std::error_code &error) { BOOST_OUTCOME_THROW_EXCEPTION(std::system_error(error)); } // NOLINT
BOOST_OUTCOME_TEMPLATE(class Error)
BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TPRED(std::is_error_code_enum<std::decay_t<Error>>::value || std::is_error_condition_enum<std::decay_t<Error>>::value))
inline void outcome_throw_as_system_error_with_payload(Error &&error, detail::std_enum_overload_tag /*unused*/ = detail::std_enum_overload_tag()) { BOOST_OUTCOME_THROW_EXCEPTION(std::system_error(make_error_code(error))); } // NOLINT
} // namespace policy
namespace trait
{
namespace detail
{
template <> struct _is_error_code_available<std::error_code>
{
// Shortcut this for lower build impact
static constexpr bool value = true;
using type = std::error_code;
};
} // namespace detail
// std::error_code is an error type
template <> struct is_error_type<std::error_code>
{
static constexpr bool value = true;
};
// For std::error_code, std::is_error_condition_enum<> is the trait we want.
template <class Enum> struct is_error_type_enum<std::error_code, Enum>
{
static constexpr bool value = std::is_error_condition_enum<Enum>::value;
};
} // namespace trait
BOOST_OUTCOME_V2_NAMESPACE_END
#endif

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/* Traits for Outcome
(C) 2018-2020 Niall Douglas <http://www.nedproductions.biz/> (3 commits)
File Created: March 2018
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#ifndef BOOST_OUTCOME_TRAIT_STD_EXCEPTION_HPP
#define BOOST_OUTCOME_TRAIT_STD_EXCEPTION_HPP
#include "../config.hpp"
#include <exception>
BOOST_OUTCOME_V2_NAMESPACE_BEGIN
namespace policy
{
namespace detail
{
/* Pass through `make_exception_ptr` function for `std::exception_ptr`.
*/
inline std::exception_ptr make_exception_ptr(std::exception_ptr v) { return v; }
// Try ADL, if not use fall backs above
template <class T> constexpr inline decltype(auto) exception_ptr(T &&v) { return make_exception_ptr(std::forward<T>(v)); }
} // namespace detail
/*! AWAITING HUGO JSON CONVERSION TOOL
SIGNATURE NOT RECOGNISED
*/
template <class T> constexpr inline decltype(auto) exception_ptr(T &&v) { return detail::exception_ptr(std::forward<T>(v)); }
namespace detail
{
template <bool has_error_payload> struct _rethrow_exception
{
template <class Exception> explicit _rethrow_exception(Exception && /*unused*/) // NOLINT
{
}
};
template <> struct _rethrow_exception<true>
{
template <class Exception> explicit _rethrow_exception(Exception &&excpt) // NOLINT
{
// ADL
rethrow_exception(policy::exception_ptr(std::forward<Exception>(excpt)));
}
};
} // namespace detail
} // namespace policy
namespace trait
{
namespace detail
{
// Shortcut this for lower build impact
template <> struct _is_exception_ptr_available<std::exception_ptr>
{
static constexpr bool value = true;
using type = std::exception_ptr;
};
} // namespace detail
// std::exception_ptr is an error type
template <> struct is_error_type<std::exception_ptr>
{
static constexpr bool value = true;
};
} // namespace trait
BOOST_OUTCOME_V2_NAMESPACE_END
#endif

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/* Sets Outcome version
(C) 2017-2020 Niall Douglas <http://www.nedproductions.biz/> (4 commits)
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
/*! AWAITING HUGO JSON CONVERSION TOOL */
#define BOOST_OUTCOME_VERSION_MAJOR 2
/*! AWAITING HUGO JSON CONVERSION TOOL */
#define BOOST_OUTCOME_VERSION_MINOR 1
/*! AWAITING HUGO JSON CONVERSION TOOL */
#define BOOST_OUTCOME_VERSION_PATCH 0
/*! AWAITING HUGO JSON CONVERSION TOOL */
#define BOOST_OUTCOME_VERSION_REVISION 0 // Revision version for cmake and DLL version stamping
/*! AWAITING HUGO JSON CONVERSION TOOL */
#ifndef BOOST_OUTCOME_DISABLE_ABI_PERMUTATION
#define BOOST_OUTCOME_UNSTABLE_VERSION
#endif