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// -*- C++ -*-
//===-------------------------- type_traits -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_EXPERIMENTAL_TYPE_TRAITS
#define _LIBCPP_EXPERIMENTAL_TYPE_TRAITS
/**
experimental/type_traits synopsis
// C++1y
#include <type_traits>
namespace std {
namespace experimental {
inline namespace fundamentals_v1 {
// 3.3.2, Other type transformations
template <class> class invocation_type; // not defined
template <class F, class... ArgTypes> class invocation_type<F(ArgTypes...)>;
template <class> class raw_invocation_type; // not defined
template <class F, class... ArgTypes> class raw_invocation_type<F(ArgTypes...)>;
template <class T>
using invocation_type_t = typename invocation_type<T>::type;
template <class T>
using raw_invocation_type_t = typename raw_invocation_type<T>::type;
// 3.3.4, Detection idiom
template <class...> using void_t = void;
struct nonesuch {
nonesuch() = delete;
~nonesuch() = delete;
nonesuch(nonesuch const&) = delete;
void operator=(nonesuch const&) = delete;
};
template <template<class...> class Op, class... Args>
using is_detected = see below;
template <template<class...> class Op, class... Args>
constexpr bool is_detected_v = is_detected<Op, Args...>::value;
template <template<class...> class Op, class... Args>
using detected_t = see below;
template <class Default, template<class...> class Op, class... Args>
using detected_or = see below;
template <class Default, template<class...> class Op, class... Args>
using detected_or_t = typename detected_or<Default, Op, Args...>::type;
template <class Expected, template<class...> class Op, class... Args>
using is_detected_exact = is_same<Expected, detected_t<Op, Args...>>;
template <class Expected, template<class...> class Op, class... Args>
constexpr bool is_detected_exact_v
= is_detected_exact<Expected, Op, Args...>::value;
template <class To, template<class...> class Op, class... Args>
using is_detected_convertible = is_convertible<detected_t<Op, Args...>, To>;
template <class To, template<class...> class Op, class... Args>
constexpr bool is_detected_convertible_v
= is_detected_convertible<To, Op, Args...>::value;
} // namespace fundamentals_v1
} // namespace experimental
} // namespace std
*/
#include <experimental/__config>
#if _LIBCPP_STD_VER > 11
#include <initializer_list>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_LFTS
// 3.3.2, Other type transformations
/*
template <class>
class _LIBCPP_TEMPLATE_VIS raw_invocation_type;
template <class _Fn, class ..._Args>
class _LIBCPP_TEMPLATE_VIS raw_invocation_type<_Fn(_Args...)>;
template <class>
class _LIBCPP_TEMPLATE_VIS invokation_type;
template <class _Fn, class ..._Args>
class _LIBCPP_TEMPLATE_VIS invokation_type<_Fn(_Args...)>;
template <class _Tp>
using invokation_type_t = typename invokation_type<_Tp>::type;
template <class _Tp>
using raw_invocation_type_t = typename raw_invocation_type<_Tp>::type;
*/
// 3.3.4, Detection idiom
template <class...> using void_t = void;
struct nonesuch : private _VSTD::__nat { // make nonesuch "not an aggregate"
~nonesuch() = delete;
nonesuch (nonesuch const&) = delete;
void operator=(nonesuch const&) = delete;
};
template <class _Default, class _AlwaysVoid, template <class...> class _Op, class... _Args>
struct _DETECTOR {
using value_t = false_type;
using type = _Default;
};
template <class _Default, template <class...> class _Op, class... _Args>
struct _DETECTOR<_Default, void_t<_Op<_Args...>>, _Op, _Args...> {
using value_t = true_type;
using type = _Op<_Args...>;
};
template <template<class...> class _Op, class... _Args>
using is_detected = typename _DETECTOR<nonesuch, void, _Op, _Args...>::value_t;
template <template<class...> class _Op, class... _Args>
using detected_t = typename _DETECTOR<nonesuch, void, _Op, _Args...>::type;
template <template<class...> class _Op, class... _Args>
_LIBCPP_CONSTEXPR bool is_detected_v = is_detected<_Op, _Args...>::value;
template <class Default, template<class...> class _Op, class... _Args>
using detected_or = _DETECTOR<Default, void, _Op, _Args...>;
template <class Default, template<class...> class _Op, class... _Args>
using detected_or_t = typename detected_or<Default, _Op, _Args...>::type;
template <class Expected, template<class...> class _Op, class... _Args>
using is_detected_exact = is_same<Expected, detected_t<_Op, _Args...>>;
template <class Expected, template<class...> class _Op, class... _Args>
_LIBCPP_CONSTEXPR bool is_detected_exact_v = is_detected_exact<Expected, _Op, _Args...>::value;
template <class To, template<class...> class _Op, class... _Args>
using is_detected_convertible = is_convertible<detected_t<_Op, _Args...>, To>;
template <class To, template<class...> class _Op, class... _Args>
_LIBCPP_CONSTEXPR bool is_detected_convertible_v = is_detected_convertible<To, _Op, _Args...>::value;
_LIBCPP_END_NAMESPACE_LFTS
#endif /* _LIBCPP_STD_VER > 11 */
#endif /* _LIBCPP_EXPERIMENTAL_TYPE_TRAITS */
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