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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_syncbuf;
// Tests the inherited function using a custom allocator.
//
// streamsize basic_streambuf<charT, traits>::sputc(const char_type* s, streamsize n);
//
// This test also validates the observable behaviour after move assignment and
// construction. This test uses a large buffer so the underlying string is in
// long mode.
#include <array>
#include <syncstream>
#include <cassert>
#include <sstream>
#include "test_macros.h"
#include "test_allocator.h"
template <class CharT>
void test() {
std::array< CharT, 17> input{
CharT('a'),
CharT('1'),
CharT('+'),
CharT('A'),
CharT('g'),
CharT('0'),
CharT('@'),
CharT('Z'),
CharT('q'),
CharT('8'),
CharT('#'),
CharT('D'),
CharT('t'),
CharT('9'),
CharT('$'),
CharT('A'),
CharT(' ')};
std::basic_string<CharT> expected;
for (int i = 0; i < 1024; ++i)
expected.push_back(input[i % input.size()]);
using SyncBuf = std::basic_syncbuf<CharT, std::char_traits<CharT>, test_allocator<CharT>>;
{ // Normal
std::basic_stringbuf<CharT> buf;
test_allocator_statistics stats;
test_allocator<CharT> allocator{&stats};
{
SyncBuf sync_buf{&buf, allocator};
std::streamsize ret = sync_buf.sputn(expected.data(), expected.size());
assert(ret == 1024);
// The synchronization happens upon destruction of sync_buf.
assert(buf.str().empty());
assert(stats.allocated_size >= 1024);
}
assert(buf.str() == expected);
assert(stats.allocated_size == 0);
}
{ // Move construction
std::basic_stringbuf<CharT> buf;
test_allocator_statistics stats;
test_allocator<CharT> allocator{&stats};
{
SyncBuf sync_buf{&buf, allocator};
std::streamsize ret = sync_buf.sputn(expected.data(), expected.size());
assert(ret == 1024);
{
SyncBuf new_sync_buf{std::move(sync_buf)};
ret = new_sync_buf.sputn(expected.data(), expected.size());
assert(ret == 1024);
// The synchronization happens upon destruction of new_sync_buf.
assert(buf.str().empty());
assert(stats.allocated_size >= 2048);
}
assert(buf.str() == expected + expected);
assert(stats.allocated_size == 0);
}
assert(buf.str() == expected + expected);
assert(stats.allocated_size == 0);
}
{ // Move assignment non-propagating allocator
std::basic_stringbuf<CharT> buf;
test_allocator_statistics stats;
test_allocator<CharT> allocator{&stats};
static_assert(!std::allocator_traits<test_allocator<CharT>>::propagate_on_container_move_assignment::value);
{
SyncBuf sync_buf{&buf, allocator};
std::streamsize ret = sync_buf.sputn(expected.data(), expected.size());
assert(ret == 1024);
{
SyncBuf new_sync_buf;
test_allocator<CharT> a = new_sync_buf.get_allocator();
new_sync_buf = std::move(sync_buf);
assert(new_sync_buf.get_allocator() == a);
ret = new_sync_buf.sputn(expected.data(), expected.size());
assert(ret == 1024);
// The synchronization happens upon destruction of new_sync_buf.
assert(buf.str().empty());
}
assert(buf.str() == expected + expected);
}
assert(buf.str() == expected + expected);
}
}
int main(int, char**) {
test<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<wchar_t>();
#endif
return 0;
}
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