92 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++0310 11// <vector>12 13// void swap(vector& c)14// noexcept(!allocator_type::propagate_on_container_swap::value ||15// __is_nothrow_swappable<allocator_type>::value);16//17// In C++17, the standard says that swap shall have:18// noexcept(allocator_traits<Allocator>::propagate_on_container_swap::value ||19// allocator_traits<Allocator>::is_always_equal::value);20 21// This tests a conforming extension22 23#include <vector>24#include <utility>25#include <cassert>26 27#include "test_macros.h"28#include "test_allocator.h"29 30template <class T>31struct some_alloc {32 typedef T value_type;33 34 some_alloc() {}35 some_alloc(const some_alloc&);36 void deallocate(void*, unsigned) {}37 38 typedef std::true_type propagate_on_container_swap;39};40 41template <class T>42struct some_alloc2 {43 typedef T value_type;44 45 some_alloc2() {}46 some_alloc2(const some_alloc2&);47 void deallocate(void*, unsigned) {}48 49 typedef std::false_type propagate_on_container_swap;50 typedef std::true_type is_always_equal;51};52 53int main(int, char**) {54#if defined(_LIBCPP_VERSION)55 {56 typedef std::vector<bool> C;57 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");58 }59 {60 typedef std::vector<bool, test_allocator<bool>> C;61 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");62 }63 {64 typedef std::vector<bool, other_allocator<bool>> C;65 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");66 }67#endif // _LIBCPP_VERSION68 {69#if TEST_STD_VER >= 1470# if defined(_LIBCPP_VERSION)71 // In C++14, if POCS is set, swapping the allocator is required not to throw72 typedef std::vector<bool, some_alloc<bool>> C;73 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");74# endif // _LIBCPP_VERSION75#else76 typedef std::vector<bool, some_alloc<bool>> C;77 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");78#endif79 }80#if TEST_STD_VER >= 1481# if defined(_LIBCPP_VERSION)82 {83 typedef std::vector<bool, some_alloc2<bool>> C;84 // if the allocators are always equal, then the swap can be noexcept85 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");86 }87# endif // _LIBCPP_VERSION88#endif89 90 return 0;91}92