swap_noexcept.pass.cpp (2492B)
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 // <list> 13 14 // void swap(list& 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 <list> 24 #include <utility> 25 #include <cassert> 26 27 #include "test_macros.h" 28 #include "MoveOnly.h" 29 #include "test_allocator.h" 30 31 template <class T> 32 struct 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 43 template <class T> 44 struct 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 56 int main() 57 { 58 { 59 typedef std::list<MoveOnly> C; 60 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), ""); 61 } 62 #if defined(_LIBCPP_VERSION) 63 { 64 typedef std::list<MoveOnly, test_allocator<MoveOnly>> C; 65 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), ""); 66 } 67 { 68 typedef std::list<MoveOnly, other_allocator<MoveOnly>> C; 69 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), ""); 70 } 71 #endif // _LIBCPP_VERSION 72 { 73 typedef std::list<MoveOnly, some_alloc<MoveOnly>> C; 74 #if TEST_STD_VER >= 14 75 // In C++14, if POCS is set, swapping the allocator is required not to throw 76 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), ""); 77 #else 78 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), ""); 79 #endif 80 } 81 #if TEST_STD_VER >= 14 82 { 83 typedef std::list<MoveOnly, some_alloc2<MoveOnly>> C; 84 // if the allocators are always equal, then the swap can be noexcept 85 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), ""); 86 } 87 #endif 88 89 }