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// <string> 11 12// void swap(basic_string& c) 13// noexcept(!allocator_type::propagate_on_container_swap::value || 14// __is_nothrow_swappable<allocator_type>::value); 15 16// This tests a conforming extension 17 18#include <string> 19#include <cassert> 20 21#include "test_allocator.h" 22 23template <class T> 24struct some_alloc 25{ 26 typedef T value_type; 27 28 some_alloc() {} 29 some_alloc(const some_alloc&); 30 void deallocate(void*, unsigned) {} 31 32 typedef std::true_type propagate_on_container_swap; 33}; 34 35int main() 36{ 37#if __has_feature(cxx_noexcept) 38 { 39 typedef std::string C; 40 C c1, c2; 41 static_assert(noexcept(swap(c1, c2)), ""); 42 } 43 { 44 typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C; 45 C c1, c2; 46 static_assert(noexcept(swap(c1, c2)), ""); 47 } 48 { 49 typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C; 50 C c1, c2; 51 static_assert(!noexcept(swap(c1, c2)), ""); 52 } 53#endif 54} 55