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