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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
//
//===----------------------------------------------------------------------===//
// <functional>
// struct is_placeholder
#include <functional>
#include "test_macros.h"
template <int Expected, class T>
void
test(const T&)
{
static_assert(std::is_placeholder<T>::value == Expected, "");
LIBCPP_STATIC_ASSERT(std::is_placeholder<T&>::value == Expected, "");
LIBCPP_STATIC_ASSERT(std::is_placeholder<const T>::value == Expected, "");
LIBCPP_STATIC_ASSERT(std::is_placeholder<const T&>::value == Expected, "");
static_assert(std::is_base_of<std::integral_constant<int, Expected>, std::is_placeholder<T> >::value, "");
LIBCPP_STATIC_ASSERT(std::is_base_of<std::integral_constant<int, Expected>, std::is_placeholder<T&> >::value, "");
LIBCPP_STATIC_ASSERT(std::is_base_of<std::integral_constant<int, Expected>, std::is_placeholder<const T> >::value, "");
LIBCPP_STATIC_ASSERT(std::is_base_of<std::integral_constant<int, Expected>, std::is_placeholder<const T&> >::value, "");
#if TEST_STD_VER > 14
ASSERT_SAME_TYPE(decltype(std::is_placeholder_v<T>), const int);
static_assert(std::is_placeholder_v<T> == Expected, "");
LIBCPP_STATIC_ASSERT(std::is_placeholder_v<T&> == Expected, "");
LIBCPP_STATIC_ASSERT(std::is_placeholder_v<const T> == Expected, "");
LIBCPP_STATIC_ASSERT(std::is_placeholder_v<const T&> == Expected, "");
#endif
}
struct C {};
int main(int, char**)
{
test<1>(std::placeholders::_1);
test<2>(std::placeholders::_2);
test<3>(std::placeholders::_3);
test<4>(std::placeholders::_4);
test<5>(std::placeholders::_5);
test<6>(std::placeholders::_6);
test<7>(std::placeholders::_7);
test<8>(std::placeholders::_8);
test<9>(std::placeholders::_9);
test<10>(std::placeholders::_10);
test<0>(4);
test<0>(5.5);
test<0>('a');
test<0>(C());
return 0;
}
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