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99 lines
3.0 KiB
C++
99 lines
3.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <functional>
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// placeholders
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// The placeholders are constexpr in C++17 and beyond.
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// libc++ provides constexpr placeholders in C++11 and beyond.
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#include <functional>
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#include <type_traits>
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#include "test_macros.h"
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template <class T>
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void
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test(const T& t)
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{
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// Test default constructible.
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T t2;
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((void)t2);
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// Test copy constructible.
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T t3 = t;
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((void)t3);
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static_assert(std::is_nothrow_copy_constructible<T>::value, "");
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static_assert(std::is_nothrow_move_constructible<T>::value, "");
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}
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#if TEST_STD_VER >= 11
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constexpr decltype(std::placeholders::_1) default1{};
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constexpr decltype(std::placeholders::_2) default2{};
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constexpr decltype(std::placeholders::_3) default3{};
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constexpr decltype(std::placeholders::_4) default4{};
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constexpr decltype(std::placeholders::_5) default5{};
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constexpr decltype(std::placeholders::_6) default6{};
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constexpr decltype(std::placeholders::_7) default7{};
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constexpr decltype(std::placeholders::_8) default8{};
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constexpr decltype(std::placeholders::_9) default9{};
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constexpr decltype(std::placeholders::_10) default10{};
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constexpr decltype(std::placeholders::_1) cp1 = std::placeholders::_1;
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constexpr decltype(std::placeholders::_2) cp2 = std::placeholders::_2;
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constexpr decltype(std::placeholders::_3) cp3 = std::placeholders::_3;
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constexpr decltype(std::placeholders::_4) cp4 = std::placeholders::_4;
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constexpr decltype(std::placeholders::_5) cp5 = std::placeholders::_5;
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constexpr decltype(std::placeholders::_6) cp6 = std::placeholders::_6;
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constexpr decltype(std::placeholders::_7) cp7 = std::placeholders::_7;
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constexpr decltype(std::placeholders::_8) cp8 = std::placeholders::_8;
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constexpr decltype(std::placeholders::_9) cp9 = std::placeholders::_9;
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constexpr decltype(std::placeholders::_10) cp10 = std::placeholders::_10;
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#endif // TEST_STD_VER >= 11
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void use_placeholders_to_prevent_unused_warning() {
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#if TEST_STD_VER >= 11
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((void)cp1);
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((void)cp2);
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((void)cp3);
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((void)cp4);
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((void)cp5);
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((void)cp6);
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((void)cp7);
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((void)cp8);
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((void)cp9);
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((void)cp10);
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((void)default1);
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((void)default2);
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((void)default3);
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((void)default4);
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((void)default5);
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((void)default6);
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((void)default7);
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((void)default8);
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((void)default9);
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((void)default10);
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#endif
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}
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int main(int, char**)
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{
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use_placeholders_to_prevent_unused_warning();
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test(std::placeholders::_1);
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test(std::placeholders::_2);
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test(std::placeholders::_3);
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test(std::placeholders::_4);
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test(std::placeholders::_5);
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test(std::placeholders::_6);
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test(std::placeholders::_7);
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test(std::placeholders::_8);
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test(std::placeholders::_9);
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test(std::placeholders::_10);
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return 0;
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}
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