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 // UNSUPPORTED: c++03 10 11 // <string> 12 13 // basic_string(basic_string&& str, const Allocator& alloc); // constexpr since C++20 14 15 #include <string> 16 #include <cassert> 17 18 #include "test_macros.h" 19 #include "test_allocator.h" 20 #include "min_allocator.h" 21 #include "asan_testing.h" 22 #include "operator_hijacker.h" 23 24 template <class S> 25 TEST_CONSTEXPR_CXX20 void test(S s0, const typename S::allocator_type& a) { 26 S s1 = s0; 27 S s2(std::move(s0), a); 28 LIBCPP_ASSERT(s2.__invariants()); 29 LIBCPP_ASSERT(s0.__invariants()); 30 assert(s2 == s1); 31 assert(s2.capacity() >= s2.size()); 32 assert(s2.get_allocator() == a); 33 LIBCPP_ASSERT(is_string_asan_correct(s0)); 34 LIBCPP_ASSERT(is_string_asan_correct(s1)); 35 LIBCPP_ASSERT(is_string_asan_correct(s2)); 36 } 37 38 TEST_CONSTEXPR_CXX20 bool test() { 39 test_allocator_statistics alloc_stats; 40 { 41 typedef test_allocator<char> A; 42 typedef std::basic_string<char, std::char_traits<char>, A> S; 43 #if TEST_STD_VER > 14 44 static_assert((noexcept(S{})), ""); 45 #elif TEST_STD_VER >= 11 46 static_assert((noexcept(S()) == std::is_nothrow_move_constructible<A>::value), ""); 47 #endif 48 test(S(), A(3, &alloc_stats)); 49 test(S("1"), A(5, &alloc_stats)); 50 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), A(7, &alloc_stats)); 51 } 52 53 int alloc_count = alloc_stats.alloc_count; 54 { 55 typedef test_allocator<char> A; 56 typedef std::basic_string<char, std::char_traits<char>, A> S; 57 #if TEST_STD_VER > 14 58 static_assert((noexcept(S{})), ""); 59 #elif TEST_STD_VER >= 11 60 static_assert((noexcept(S()) == std::is_nothrow_move_constructible<A>::value), ""); 61 #endif 62 S s1("Twas brillig, and the slivy toves did gyre and gymbal in the wabe", A(&alloc_stats)); 63 S s2(std::move(s1), A(1, &alloc_stats)); 64 } 65 assert(alloc_stats.alloc_count == alloc_count); 66 { 67 typedef min_allocator<char> A; 68 typedef std::basic_string<char, std::char_traits<char>, A> S; 69 #if TEST_STD_VER > 14 70 static_assert((noexcept(S{})), ""); 71 #elif TEST_STD_VER >= 11 72 static_assert((noexcept(S()) == std::is_nothrow_move_constructible<A>::value), ""); 73 #endif 74 test(S(), A()); 75 test(S("1"), A()); 76 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), A()); 77 } 78 { 79 typedef operator_hijacker_allocator<char> A; 80 typedef std::basic_string<char, std::char_traits<char>, A> S; 81 #if TEST_STD_VER > 14 82 static_assert((noexcept(S{})), ""); 83 #elif TEST_STD_VER >= 11 84 static_assert((noexcept(S()) == std::is_nothrow_move_constructible<A>::value), ""); 85 #endif 86 test(S(), A()); 87 test(S("1"), A()); 88 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), A()); 89 } 90 91 return true; 92 } 93 94 int main(int, char**) { 95 test(); 96 #if TEST_STD_VER > 17 97 static_assert(test()); 98 #endif 99 100 return 0; 101 } 102