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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>
// placeholders
// The placeholders are constexpr in C++17 and beyond.
// libc++ provides constexpr placeholders in C++11 and beyond.
#include <functional>
#include <type_traits>
#include "test_macros.h"
template <class T>
void
test(const T& t)
{
// Test default constructible.
T t2;
((void)t2);
// Test copy constructible.
T t3 = t;
((void)t3);
static_assert(std::is_nothrow_copy_constructible<T>::value, "");
static_assert(std::is_nothrow_move_constructible<T>::value, "");
}
#if TEST_STD_VER >= 11
constexpr decltype(std::placeholders::_1) default1{};
constexpr decltype(std::placeholders::_2) default2{};
constexpr decltype(std::placeholders::_3) default3{};
constexpr decltype(std::placeholders::_4) default4{};
constexpr decltype(std::placeholders::_5) default5{};
constexpr decltype(std::placeholders::_6) default6{};
constexpr decltype(std::placeholders::_7) default7{};
constexpr decltype(std::placeholders::_8) default8{};
constexpr decltype(std::placeholders::_9) default9{};
constexpr decltype(std::placeholders::_10) default10{};
constexpr decltype(std::placeholders::_1) cp1 = std::placeholders::_1;
constexpr decltype(std::placeholders::_2) cp2 = std::placeholders::_2;
constexpr decltype(std::placeholders::_3) cp3 = std::placeholders::_3;
constexpr decltype(std::placeholders::_4) cp4 = std::placeholders::_4;
constexpr decltype(std::placeholders::_5) cp5 = std::placeholders::_5;
constexpr decltype(std::placeholders::_6) cp6 = std::placeholders::_6;
constexpr decltype(std::placeholders::_7) cp7 = std::placeholders::_7;
constexpr decltype(std::placeholders::_8) cp8 = std::placeholders::_8;
constexpr decltype(std::placeholders::_9) cp9 = std::placeholders::_9;
constexpr decltype(std::placeholders::_10) cp10 = std::placeholders::_10;
#endif // TEST_STD_VER >= 11
void use_placeholders_to_prevent_unused_warning() {
#if TEST_STD_VER >= 11
((void)cp1);
((void)cp2);
((void)cp3);
((void)cp4);
((void)cp5);
((void)cp6);
((void)cp7);
((void)cp8);
((void)cp9);
((void)cp10);
((void)default1);
((void)default2);
((void)default3);
((void)default4);
((void)default5);
((void)default6);
((void)default7);
((void)default8);
((void)default9);
((void)default10);
#endif
}
int main(int, char**)
{
use_placeholders_to_prevent_unused_warning();
test(std::placeholders::_1);
test(std::placeholders::_2);
test(std::placeholders::_3);
test(std::placeholders::_4);
test(std::placeholders::_5);
test(std::placeholders::_6);
test(std::placeholders::_7);
test(std::placeholders::_8);
test(std::placeholders::_9);
test(std::placeholders::_10);
return 0;
}
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