1 //===----------------------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
13 // The placeholders are constexpr in C++17 and beyond.
14 // libc++ provides constexpr placeholders in C++11 and beyond.
17 #include <type_traits>
19 #include "test_macros.h"
25 // Test default constructible.
28 // Test copy constructible.
31 static_assert(std::is_nothrow_copy_constructible<T>::value, "");
32 static_assert(std::is_nothrow_move_constructible<T>::value, "");
35 #if TEST_STD_VER >= 11
36 constexpr decltype(std::placeholders::_1) default1{};
37 constexpr decltype(std::placeholders::_2) default2{};
38 constexpr decltype(std::placeholders::_3) default3{};
39 constexpr decltype(std::placeholders::_4) default4{};
40 constexpr decltype(std::placeholders::_5) default5{};
41 constexpr decltype(std::placeholders::_6) default6{};
42 constexpr decltype(std::placeholders::_7) default7{};
43 constexpr decltype(std::placeholders::_8) default8{};
44 constexpr decltype(std::placeholders::_9) default9{};
45 constexpr decltype(std::placeholders::_10) default10{};
47 constexpr decltype(std::placeholders::_1) cp1 = std::placeholders::_1;
48 constexpr decltype(std::placeholders::_2) cp2 = std::placeholders::_2;
49 constexpr decltype(std::placeholders::_3) cp3 = std::placeholders::_3;
50 constexpr decltype(std::placeholders::_4) cp4 = std::placeholders::_4;
51 constexpr decltype(std::placeholders::_5) cp5 = std::placeholders::_5;
52 constexpr decltype(std::placeholders::_6) cp6 = std::placeholders::_6;
53 constexpr decltype(std::placeholders::_7) cp7 = std::placeholders::_7;
54 constexpr decltype(std::placeholders::_8) cp8 = std::placeholders::_8;
55 constexpr decltype(std::placeholders::_9) cp9 = std::placeholders::_9;
56 constexpr decltype(std::placeholders::_10) cp10 = std::placeholders::_10;
57 #endif // TEST_STD_VER >= 11
61 test(std::placeholders::_1);
62 test(std::placeholders::_2);
63 test(std::placeholders::_3);
64 test(std::placeholders::_4);
65 test(std::placeholders::_5);
66 test(std::placeholders::_6);
67 test(std::placeholders::_7);
68 test(std::placeholders::_8);
69 test(std::placeholders::_9);
70 test(std::placeholders::_10);