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