1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // <vector> 10 // UNSUPPORTED: c++03, c++11, c++14 11 12 // template <class InputIterator, class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>> 13 // vector(InputIterator, InputIterator, Allocator = Allocator()) 14 // -> vector<typename iterator_traits<InputIterator>::value_type, Allocator>; 15 // 16 17 #include <algorithm> 18 #include <vector> 19 #include <cassert> 20 #include <cstddef> 21 #include <climits> // INT_MAX 22 #include <iterator> 23 #include <type_traits> 24 25 #include "deduction_guides_sfinae_checks.h" 26 #include "test_macros.h" 27 #include "test_iterators.h" 28 #include "test_allocator.h" 29 30 struct A {}; 31 32 TEST_CONSTEXPR_CXX20 bool tests() { 33 34 // Test the explicit deduction guides 35 { 36 const int arr[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 37 std::vector vec(std::begin(arr), std::end(arr)); 38 39 static_assert(std::is_same_v<decltype(vec), std::vector<int>>, ""); 40 assert(std::equal(vec.begin(), vec.end(), std::begin(arr), std::end(arr))); 41 } 42 43 { 44 const long arr[] = {INT_MAX, 1L, 2L, 3L }; 45 std::vector vec(std::begin(arr), std::end(arr), std::allocator<long>()); 46 static_assert(std::is_same_v<decltype(vec)::value_type, long>, ""); 47 assert(vec.size() == 4); 48 assert(vec[0] == INT_MAX); 49 assert(vec[1] == 1L); 50 assert(vec[2] == 2L); 51 } 52 53 // Test the implicit deduction guides 54 55 { 56 // We don't expect this one to work. 57 // std::vector vec(std::allocator<int>()); // vector (allocator &) 58 } 59 60 { 61 std::vector vec(1, A{}); // vector (size_type, T) 62 static_assert(std::is_same_v<decltype(vec)::value_type, A>, ""); 63 static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<A>>, ""); 64 assert(vec.size() == 1); 65 } 66 67 { 68 std::vector vec(1, A{}, test_allocator<A>()); // vector (size_type, T, allocator) 69 static_assert(std::is_same_v<decltype(vec)::value_type, A>, ""); 70 static_assert(std::is_same_v<decltype(vec)::allocator_type, test_allocator<A>>, ""); 71 assert(vec.size() == 1); 72 } 73 74 { 75 std::vector vec{1U, 2U, 3U, 4U, 5U}; // vector(initializer-list) 76 static_assert(std::is_same_v<decltype(vec)::value_type, unsigned>, ""); 77 assert(vec.size() == 5); 78 assert(vec[2] == 3U); 79 } 80 81 { 82 std::vector vec({1.0, 2.0, 3.0, 4.0}, test_allocator<double>()); // vector(initializer-list, allocator) 83 static_assert(std::is_same_v<decltype(vec)::value_type, double>, ""); 84 static_assert(std::is_same_v<decltype(vec)::allocator_type, test_allocator<double>>, ""); 85 assert(vec.size() == 4); 86 assert(vec[3] == 4.0); 87 } 88 89 { 90 std::vector<long double> source; 91 std::vector vec(source); // vector(vector &) 92 static_assert(std::is_same_v<decltype(vec)::value_type, long double>, ""); 93 static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<long double>>, ""); 94 assert(vec.size() == 0); 95 } 96 97 98 // A couple of vector<bool> tests, too! 99 { 100 std::vector vec(3, true); // vector(initializer-list) 101 static_assert(std::is_same_v<decltype(vec)::value_type, bool>, ""); 102 static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<bool>>, ""); 103 assert(vec.size() == 3); 104 assert(vec[0] && vec[1] && vec[2]); 105 } 106 107 { 108 std::vector<bool> source; 109 std::vector vec(source); // vector(vector &) 110 static_assert(std::is_same_v<decltype(vec)::value_type, bool>, ""); 111 static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<bool>>, ""); 112 assert(vec.size() == 0); 113 } 114 115 { 116 typedef test_allocator<short> Alloc; 117 typedef test_allocator<int> ConvertibleToAlloc; 118 119 { 120 std::vector<short, Alloc> source; 121 std::vector vec(source, Alloc(2)); 122 static_assert(std::is_same_v<decltype(vec), decltype(source)>); 123 } 124 125 { 126 std::vector<short, Alloc> source; 127 std::vector vec(source, ConvertibleToAlloc(2)); 128 static_assert(std::is_same_v<decltype(vec), decltype(source)>); 129 } 130 131 { 132 std::vector<short, Alloc> source; 133 std::vector vec(std::move(source), Alloc(2)); 134 static_assert(std::is_same_v<decltype(vec), decltype(source)>); 135 } 136 137 { 138 std::vector<short, Alloc> source; 139 std::vector vec(std::move(source), ConvertibleToAlloc(2)); 140 static_assert(std::is_same_v<decltype(vec), decltype(source)>); 141 } 142 } 143 144 SequenceContainerDeductionGuidesSfinaeAway<std::vector, std::vector<int>>(); 145 146 return true; 147 } 148 149 int main(int, char**) { 150 tests(); 151 #if TEST_STD_VER > 17 152 static_assert(tests()); 153 #endif 154 return 0; 155 } 156