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// UNSUPPORTED: c++98, c++03 11 12// <vector> 13 14// void swap(vector& c) 15// noexcept(!allocator_type::propagate_on_container_swap::value || 16// __is_nothrow_swappable<allocator_type>::value); 17// 18// In C++17, the standard says that swap shall have: 19// noexcept(allocator_traits<Allocator>::propagate_on_container_swap::value || 20// allocator_traits<Allocator>::is_always_equal::value); 21 22// This tests a conforming extension 23 24#include <vector> 25#include <cassert> 26 27#include "test_macros.h" 28#include "MoveOnly.h" 29#include "test_allocator.h" 30 31template <class T> 32struct some_alloc 33{ 34 typedef T value_type; 35 36 some_alloc() {} 37 some_alloc(const some_alloc&); 38 void deallocate(void*, unsigned) {} 39 40 typedef std::true_type propagate_on_container_swap; 41}; 42 43template <class T> 44struct some_alloc2 45{ 46 typedef T value_type; 47 48 some_alloc2() {} 49 some_alloc2(const some_alloc2&); 50 void deallocate(void*, unsigned) {} 51 52 typedef std::false_type propagate_on_container_swap; 53 typedef std::true_type is_always_equal; 54}; 55 56int main() 57{ 58 { 59 typedef std::vector<MoveOnly> C; 60 C c1, c2; 61 static_assert(noexcept(swap(c1, c2)), ""); 62 } 63 { 64 typedef std::vector<MoveOnly, test_allocator<MoveOnly>> C; 65 C c1, c2; 66 static_assert(noexcept(swap(c1, c2)), ""); 67 } 68 { 69 typedef std::vector<MoveOnly, other_allocator<MoveOnly>> C; 70 C c1, c2; 71 static_assert(noexcept(swap(c1, c2)), ""); 72 } 73 { 74 typedef std::vector<MoveOnly, some_alloc<MoveOnly>> C; 75 C c1, c2; 76#if TEST_STD_VER >= 14 77 // In c++14, if POCS is set, swapping the allocator is required not to throw 78 static_assert( noexcept(swap(c1, c2)), ""); 79#else 80 static_assert(!noexcept(swap(c1, c2)), ""); 81#endif 82 } 83#if TEST_STD_VER >= 14 84 { 85 typedef std::vector<MoveOnly, some_alloc2<MoveOnly>> C; 86 C c1, c2; 87 // if the allocators are always equal, then the swap can be noexcept 88 static_assert( noexcept(swap(c1, c2)), ""); 89 } 90#endif 91} 92