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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// <sstream>
// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
// class basic_stringbuf
// void swap(basic_stringbuf& rhs)
// noexcept(allocator_traits<allocator_type>::propagate_on_container_swap::value ||
// allocator_traits<allocator_type>::is_always_equal::value);
#include <sstream>
#include <cassert>
#include "test_macros.h"
template <class T>
struct test_alloc {
using value_type = T;
[[nodiscard]] constexpr T* allocate(std::size_t) { return nullptr; }
void deallocate(void*, std::size_t) {}
};
template <class T>
struct test_alloc_propagate_on_container_swap : test_alloc<T> {
using propagate_on_container_swap = std::true_type;
};
template <class T>
struct test_alloc_is_always_equal : test_alloc<T> {
using is_always_equal = std::true_type;
};
template <class T>
struct test_alloc_propagate_on_container_swap_is_always_equal : test_alloc<T> {
using propagate_on_container_swap = std::true_type;
using is_always_equal = std::true_type;
};
template <class T>
struct test_alloc_not_empty : test_alloc<T> {
bool dummy;
};
template <class T>
struct test_alloc_propagate_on_container_swap_not_empty : test_alloc<T> {
using propagate_on_container_swap = std::true_type;
bool dummy;
};
template <class CharT>
static void test() {
{
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc<CharT>> buf1;
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc<CharT>> buf;
static_assert(noexcept(buf.swap(buf1)));
}
{
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_propagate_on_container_swap<CharT>> buf1;
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_propagate_on_container_swap<CharT>> buf;
static_assert(noexcept(buf.swap(buf1)));
}
{
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_is_always_equal<CharT>> buf1;
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_is_always_equal<CharT>> buf;
static_assert(noexcept(buf.swap(buf1)));
}
{
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_propagate_on_container_swap_is_always_equal<CharT>>
buf1;
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_propagate_on_container_swap_is_always_equal<CharT>>
buf;
static_assert(noexcept(buf.swap(buf1)));
}
{
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_not_empty<CharT>> buf1;
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_not_empty<CharT>> buf;
LIBCPP_STATIC_ASSERT(!noexcept(buf.swap(buf1)));
}
{
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_propagate_on_container_swap_not_empty<CharT>> buf1;
std::basic_stringbuf<CharT, std::char_traits<CharT>, test_alloc_propagate_on_container_swap_not_empty<CharT>> buf;
static_assert(noexcept(buf.swap(buf1)));
}
}
int main(int, char**) {
test<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<wchar_t>();
#endif
return 0;
}
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