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Diffstat (limited to 'boost/outcome/trait.hpp')
| -rw-r--r-- | boost/outcome/trait.hpp | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/boost/outcome/trait.hpp b/boost/outcome/trait.hpp new file mode 100644 index 0000000000..3279dcbf0b --- /dev/null +++ b/boost/outcome/trait.hpp @@ -0,0 +1,131 @@ +/* Traits for Outcome +(C) 2018-2019 Niall Douglas <http://www.nedproductions.biz/> (59 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_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 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; + }; + template <class T> struct _is_exception_ptr_available + { + static constexpr bool value = detail::introspect_make_exception_ptr<T>::value; + }; + } // 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; + }; + 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>>::value; + }; + template <class T> constexpr bool is_exception_ptr_available_v = detail::_is_exception_ptr_available<std::decay<T>>::value; + + +} // namespace trait + +BOOST_OUTCOME_V2_NAMESPACE_END + +#endif |