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