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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
// UNSUPPORTED: no-localization
// UNSUPPORTED: libcpp-has-no-experimental-syncstream
// <syncstream>
// template <class charT, class traits, class Allocator>
// class basic_osyncstream;
// basic_osyncstream& operator=(basic_osyncstream&& rhs);
#include <syncstream>
#include <sstream>
#include <cassert>
#include "test_macros.h"
#include "test_allocator.h"
template <class CharT, bool propagate>
static void test() {
using Traits = std::char_traits<CharT>;
using Allocator = std::conditional_t<propagate, other_allocator<CharT>, test_allocator<CharT>>;
static_assert(std::allocator_traits<Allocator>::propagate_on_container_move_assignment::value == propagate);
using OS = std::basic_osyncstream<CharT, Traits, Allocator>;
std::basic_stringbuf<CharT, Traits, Allocator> base1;
std::basic_stringbuf<CharT, Traits, Allocator> base2;
{
OS out1{&base1, Allocator{42}};
assert(out1.get_wrapped() == &base1);
typename OS::syncbuf_type* sb1 = out1.rdbuf();
assert(sb1->get_wrapped() == &base1);
assert(sb1->get_allocator().get_data() == 42);
out1 << CharT('A');
static_assert(!noexcept(out1.operator=(std::move(out1)))); // LWG-3867
OS out2{&base2, Allocator{99}};
out2 << CharT('Z');
// Validate the data is still in the syncbuf and not in the stringbuf.
assert(base1.str().empty());
assert(base2.str().empty());
out2 = std::move(out1);
// Since sb2 is overwritten by the move its data should be in its stringbuf.
assert(base1.str().empty());
assert(base2.str().size() == 1);
assert(base2.str()[0] == CharT('Z'));
assert(out2.get_wrapped() == &base1);
typename OS::syncbuf_type* sb2 = out2.rdbuf();
assert(sb2->get_wrapped() == &base1);
if constexpr (std::allocator_traits<Allocator>::propagate_on_container_move_assignment::value)
assert(sb2->get_allocator().get_data() == 42);
else
assert(sb2->get_allocator().get_data() == 99);
assert(out1.get_wrapped() == nullptr);
assert(sb1->get_wrapped() == nullptr);
// The data written to 2 will be stored in sb1. The write happens after the destruction.
out2 << CharT('B');
assert(base1.str().empty());
}
assert(base1.str().size() == 2);
assert(base1.str()[0] == CharT('A'));
assert(base1.str()[1] == CharT('B'));
assert(base2.str().size() == 1);
assert(base2.str()[0] == CharT('Z'));
}
template <class CharT>
static void test() {
test<CharT, true>();
test<CharT, false>();
}
int main(int, char**) {
test<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<wchar_t>();
#endif
return 0;
}
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