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//
// 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
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___CONCEPTS_CONVERTIBLE_TO_H
#define _LIBCUDACXX___CONCEPTS_CONVERTIBLE_TO_H
#ifndef __cuda_std__
#include <__config>
#endif //__cuda_std__
#include "../__concepts/__concept_macros.h"
#include "../__type_traits/is_convertible.h"
#include "../__utility/declval.h"
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_STD
#if _LIBCUDACXX_STD_VER > 17
// [concept.convertible]
template<class _From, class _To>
concept convertible_to =
is_convertible_v<_From, _To> &&
requires {
static_cast<_To>(_CUDA_VSTD::declval<_From>());
};
#elif _LIBCUDACXX_STD_VER > 11
#if defined(_LIBCUDACXX_COMPILER_MSVC)
_LIBCUDACXX_NV_DIAG_SUPPRESS(1211) // nonstandard cast to array type ignored
#endif // _LIBCUDACXX_COMPILER_MSVC
// We cannot put this conversion check with the other constraint, as types with deleted operator will break here
template<class _From, class _To>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__test_conversion_,
requires()(
static_cast<_To>(_CUDA_VSTD::declval<_From>())
));
template<class _From, class _To>
_LIBCUDACXX_CONCEPT __test_conversion = _LIBCUDACXX_FRAGMENT(__test_conversion_, _From, _To);
template<class _From, class _To>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__convertible_to_,
requires()(
requires(_LIBCUDACXX_TRAIT(is_convertible, _From, _To)),
requires(__test_conversion<_From, _To>)
));
template<class _From, class _To>
_LIBCUDACXX_CONCEPT convertible_to = _LIBCUDACXX_FRAGMENT(__convertible_to_, _From, _To);
#if defined(_LIBCUDACXX_COMPILER_MSVC)
_LIBCUDACXX_NV_DIAG_DEFAULT(1211) // nonstandard cast to array type ignored
#endif // _LIBCUDACXX_COMPILER_MSVC
#endif // _LIBCUDACXX_STD_VER > 11
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___CONCEPTS_CONVERTIBLE_TO_H
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