144 lines
5.8 KiB
C++
144 lines
5.8 KiB
C++
/* Traits for Outcome
|
|
(C) 2018-2022 Niall Douglas <http://www.nedproductions.biz/> (8 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_HPP
|
|
#define BOOST_OUTCOME_TRAIT_HPP
|
|
|
|
#include "config.hpp"
|
|
|
|
BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
|
|
|
|
namespace trait
|
|
{
|
|
/*! AWAITING HUGO JSON CONVERSION TOOL
|
|
SIGNATURE NOT RECOGNISED
|
|
*/
|
|
template <class R> //
|
|
static constexpr bool type_can_be_used_in_basic_result = //
|
|
(!std::is_reference<R>::value //
|
|
&& !BOOST_OUTCOME_V2_NAMESPACE::detail::is_in_place_type_t<std::decay_t<R>>::value //
|
|
&& !is_success_type<R> //
|
|
&& !is_failure_type<R> //
|
|
&& !std::is_array<R>::value //
|
|
&& (std::is_void<R>::value || (std::is_object<R>::value //
|
|
&& std::is_destructible<R>::value)) //
|
|
);
|
|
|
|
/*! AWAITING HUGO JSON CONVERSION TOOL
|
|
type definition is_error_type. Potential doc page: NOT FOUND
|
|
*/
|
|
template <class T> struct is_move_bitcopying
|
|
{
|
|
static constexpr bool value = false;
|
|
};
|
|
|
|
/*! AWAITING HUGO JSON CONVERSION TOOL
|
|
type definition is_error_type. Potential doc page: NOT FOUND
|
|
*/
|
|
template <class E> struct is_error_type
|
|
{
|
|
static constexpr bool value = false;
|
|
};
|
|
|
|
/*! AWAITING HUGO JSON CONVERSION TOOL
|
|
type definition is_error_type_enum. Potential doc page: NOT FOUND
|
|
*/
|
|
template <class E, class Enum> struct is_error_type_enum
|
|
{
|
|
static constexpr bool value = false;
|
|
};
|
|
|
|
namespace detail
|
|
{
|
|
template <class T> using devoid = BOOST_OUTCOME_V2_NAMESPACE::detail::devoid<T>;
|
|
template <class T> std::add_rvalue_reference_t<devoid<T>> declval() noexcept;
|
|
|
|
// From http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4436.pdf
|
|
namespace detector_impl
|
|
{
|
|
template <class...> using void_t = void;
|
|
template <class Default, class, template <class...> class Op, class... Args> struct detector
|
|
{
|
|
static constexpr bool value = false;
|
|
using type = Default;
|
|
};
|
|
template <class Default, template <class...> class Op, class... Args> struct detector<Default, void_t<Op<Args...>>, Op, Args...>
|
|
{
|
|
static constexpr bool value = true;
|
|
using type = Op<Args...>;
|
|
};
|
|
} // namespace detector_impl
|
|
template <template <class...> class Op, class... Args> using is_detected = detector_impl::detector<void, void, Op, Args...>;
|
|
|
|
template <class Arg> using result_of_make_error_code = decltype(make_error_code(declval<Arg>()));
|
|
template <class Arg> using introspect_make_error_code = is_detected<result_of_make_error_code, Arg>;
|
|
|
|
template <class Arg> using result_of_make_exception_ptr = decltype(make_exception_ptr(declval<Arg>()));
|
|
template <class Arg> using introspect_make_exception_ptr = is_detected<result_of_make_exception_ptr, Arg>;
|
|
|
|
template <class T> struct _is_error_code_available
|
|
{
|
|
static constexpr bool value = detail::introspect_make_error_code<T>::value;
|
|
using type = typename detail::introspect_make_error_code<T>::type;
|
|
};
|
|
template <class T> struct _is_exception_ptr_available
|
|
{
|
|
static constexpr bool value = detail::introspect_make_exception_ptr<T>::value;
|
|
using type = typename detail::introspect_make_exception_ptr<T>::type;
|
|
};
|
|
} // namespace detail
|
|
|
|
/*! AWAITING HUGO JSON CONVERSION TOOL
|
|
type definition is_error_code_available. Potential doc page: NOT FOUND
|
|
*/
|
|
template <class T> struct is_error_code_available
|
|
{
|
|
static constexpr bool value = detail::_is_error_code_available<std::decay_t<T>>::value;
|
|
using type = typename detail::_is_error_code_available<std::decay_t<T>>::type;
|
|
};
|
|
template <class T> constexpr bool is_error_code_available_v = detail::_is_error_code_available<std::decay_t<T>>::value;
|
|
|
|
/*! AWAITING HUGO JSON CONVERSION TOOL
|
|
type definition is_exception_ptr_available. Potential doc page: NOT FOUND
|
|
*/
|
|
template <class T> struct is_exception_ptr_available
|
|
{
|
|
static constexpr bool value = detail::_is_exception_ptr_available<std::decay_t<T>>::value;
|
|
using type = typename detail::_is_exception_ptr_available<std::decay_t<T>>::type;
|
|
};
|
|
template <class T> constexpr bool is_exception_ptr_available_v = detail::_is_exception_ptr_available<std::decay_t<T>>::value;
|
|
|
|
|
|
} // namespace trait
|
|
|
|
BOOST_OUTCOME_V2_NAMESPACE_END
|
|
|
|
#endif
|