value.pass.cpp revision 2c429bee79204b77cff067695798dfac5605820d
1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// UNSUPPORTED: c++98, c++03, c++11, c++14 11 12// <any> 13 14// template <class Value> any(Value &&) 15 16// Test construction from a value. 17// Concerns: 18// --------- 19// 1. The value is properly move/copied depending on the value category. 20// 2. Both small and large values are properly handled. 21 22 23#include <any> 24#include <cassert> 25 26#include "any_helpers.h" 27#include "count_new.hpp" 28#include "test_macros.h" 29 30using std::any; 31using std::any_cast; 32 33template <class Type> 34void test_copy_value_throws() 35{ 36#if !defined(TEST_HAS_NO_EXCEPTIONS) 37 assert(Type::count == 0); 38 { 39 Type const t(42); 40 assert(Type::count == 1); 41 try { 42 any const a2(t); 43 assert(false); 44 } catch (my_any_exception const &) { 45 // do nothing 46 } catch (...) { 47 assert(false); 48 } 49 assert(Type::count == 1); 50 assert(t.value == 42); 51 } 52 assert(Type::count == 0); 53#endif 54} 55 56void test_move_value_throws() 57{ 58#if !defined(TEST_HAS_NO_EXCEPTIONS) 59 assert(throws_on_move::count == 0); 60 { 61 throws_on_move v; 62 assert(throws_on_move::count == 1); 63 try { 64 any const a(std::move(v)); 65 assert(false); 66 } catch (my_any_exception const &) { 67 // do nothing 68 } catch (...) { 69 assert(false); 70 } 71 assert(throws_on_move::count == 1); 72 } 73 assert(throws_on_move::count == 0); 74#endif 75} 76 77template <class Type> 78void test_copy_move_value() { 79 // constructing from a small type should perform no allocations. 80 DisableAllocationGuard g(isSmallType<Type>()); ((void)g); 81 assert(Type::count == 0); 82 Type::reset(); 83 { 84 Type t(42); 85 assert(Type::count == 1); 86 87 any a(t); 88 89 assert(Type::count == 2); 90 assert(Type::copied == 1); 91 assert(Type::moved == 0); 92 assertContains<Type>(a, 42); 93 } 94 assert(Type::count == 0); 95 Type::reset(); 96 { 97 Type t(42); 98 assert(Type::count == 1); 99 100 any a(std::move(t)); 101 102 assert(Type::count == 2); 103 assert(Type::copied == 0); 104 assert(Type::moved == 1); 105 assertContains<Type>(a, 42); 106 } 107} 108 109// Test that any(ValueType&&) is *never* selected for a std::in_place type. 110void test_sfinae_constraints() { 111 using Tag = std::in_place_type_t<int>; 112#if defined(__clang__) 113#pragma clang diagnostic push 114#pragma clang diagnostic ignored "-Wignored-qualifiers" 115#endif 116 static_assert(std::is_same<Tag, const Tag>::value, ""); 117#if defined(__clang__) 118#pragma clang diagnostic pop 119#endif 120 // Test that the tag type is properly handled in SFINAE 121 Tag t = std::in_place; 122 { 123 std::any a(t); 124 assertContains<int>(a, 0); 125 } 126 { 127 std::any a(std::move(t)); 128 assertContains<int>(a, 0); 129 } 130 { 131 struct Dummy { Dummy() = delete; }; 132 using T = std::in_place_type_t<Dummy>; 133 static_assert(!std::is_constructible<std::any, T>::value, ""); 134 } 135 { 136 // Test that the ValueType&& constructor SFINAE's away when the 137 // argument is non-copyable 138 struct NoCopy { 139 NoCopy() = default; 140 NoCopy(NoCopy const&) = delete; 141 NoCopy(int) {} 142 }; 143 static_assert(!std::is_constructible<std::any, NoCopy>::value, ""); 144 static_assert(!std::is_constructible<std::any, NoCopy&>::value, ""); 145 static_assert(!std::is_convertible<NoCopy, std::any>::value, ""); 146 } 147} 148 149int main() { 150 test_copy_move_value<small>(); 151 test_copy_move_value<large>(); 152 test_copy_value_throws<small_throws_on_copy>(); 153 test_copy_value_throws<large_throws_on_copy>(); 154 test_move_value_throws(); 155 test_sfinae_constraints(); 156}