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clang-p2996/libcxx/test/std/input.output/syncstream/syncbuf/syncstream.syncbuf.assign/swap.pass.cpp
Mark de Wever 7cc72a0a2e Implement syncstream (p0053) 
This patch implements `std::basic_syncbuf` and `std::basic_osyncstream` as specified in paper p0053r7. ~~For ease of reviewing I am submitting this patch before submitting a patch for `std::basic_osyncstream`. ~~

~~Please note, this patch is not 100% complete. I plan on adding more tests (see comments), specifically I plan on adding tests for multithreading and synchronization.~~

Edit: I decided that it would be far easier for me to keep track of this and make changes that affect both `std::basic_syncbuf` and `std::basic_osyncstream` if both were in one patch.

The patch was originally written by @zoecarver

Implements
- P0053R7 - C++ Synchronized Buffered Ostream
- LWG-3127 basic_osyncstream::rdbuf needs a const_cast
- LWG-3334 basic_osyncstream move assignment and destruction calls basic_syncbuf::emit() twice
- LWG-3570 basic_osyncstream::emit should be an unformatted output function
- LWG-3867 Should std::basic_osyncstream's move assignment operator be noexcept?

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D67086
2023-11-08 17:45:06 +01:00

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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;
// void swap(basic_syncbuf& other) noexcept;
#include <syncstream>
#include <sstream>
#include <cassert>
#include "test_macros.h"
#include <iostream>
template <class CharT>
static void test_basic() {
std::basic_stringbuf<CharT> sstr1;
std::basic_stringbuf<CharT> sstr2;
std::basic_string<CharT> expected(42, CharT('*')); // a long string
{
std::basic_syncbuf<CharT> sync_buf1(&sstr1);
sync_buf1.sputc(CharT('A')); // a short string
std::basic_syncbuf<CharT> sync_buf2(&sstr2);
sync_buf2.sputn(expected.data(), expected.size());
#if defined(_LIBCPP_VERSION) && !defined(TEST_HAS_NO_THREADS)
assert(std::__wrapped_streambuf_mutex::__instance().__get_count(&sstr1) == 1);
assert(std::__wrapped_streambuf_mutex::__instance().__get_count(&sstr2) == 1);
#endif
sync_buf1.swap(sync_buf2);
assert(sync_buf1.get_wrapped() == &sstr2);
assert(sync_buf2.get_wrapped() == &sstr1);
assert(sstr1.str().empty());
assert(sstr2.str().empty());
#if defined(_LIBCPP_VERSION) && !defined(TEST_HAS_NO_THREADS)
assert(std::__wrapped_streambuf_mutex::__instance().__get_count(&sstr1) == 1);
assert(std::__wrapped_streambuf_mutex::__instance().__get_count(&sstr2) == 1);
#endif
}
assert(sstr1.str().size() == 1);
assert(sstr1.str()[0] == CharT('A'));
assert(sstr2.str() == expected);
}
template <class CharT>
static void test_short_write_after_swap() {
std::basic_stringbuf<CharT> sstr1;
std::basic_stringbuf<CharT> sstr2;
std::basic_string<CharT> expected(42, CharT('*')); // a long string
{
std::basic_syncbuf<CharT> sync_buf1(&sstr1);
sync_buf1.sputc(CharT('A')); // a short string
std::basic_syncbuf<CharT> sync_buf2(&sstr2);
sync_buf2.sputn(expected.data(), expected.size());
sync_buf1.swap(sync_buf2);
expected.push_back(sync_buf1.sputc(CharT('B')));
sync_buf2.sputc(CharT('Z'));
assert(sstr1.str().empty());
assert(sstr2.str().empty());
}
assert(sstr1.str().size() == 2);
assert(sstr1.str()[0] == CharT('A'));
assert(sstr1.str()[1] == CharT('Z'));
assert(sstr2.str() == expected);
}
template <class CharT>
static void test_long_write_after_swap() {
std::basic_stringbuf<CharT> sstr1;
std::basic_stringbuf<CharT> sstr2;
std::basic_string<CharT> expected(42, CharT('*')); // a long string
{
std::basic_syncbuf<CharT> sync_buf1(&sstr1);
sync_buf1.sputc(CharT('A')); // a short string
std::basic_syncbuf<CharT> sync_buf2(&sstr2);
sync_buf2.sputn(expected.data(), expected.size());
sync_buf1.swap(sync_buf2);
sync_buf1.sputn(expected.data(), expected.size());
sync_buf2.sputn(expected.data(), expected.size());
assert(sstr1.str().empty());
assert(sstr2.str().empty());
}
assert(sstr1.str().size() == 1 + expected.size());
assert(sstr1.str()[0] == CharT('A'));
assert(sstr1.str().substr(1) == expected);
assert(sstr2.str() == expected + expected);
}
template <class CharT>
static void test_emit_on_sync() {
{ // false false
std::basic_stringbuf<CharT> sstr1;
std::basic_stringbuf<CharT> sstr2;
std::basic_string<CharT> expected(42, CharT('*')); // a long string
{
std::basic_syncbuf<CharT> sync_buf1(&sstr1);
sync_buf1.set_emit_on_sync(false);
sync_buf1.sputc(CharT('A')); // a short string
std::basic_syncbuf<CharT> sync_buf2(&sstr2);
sync_buf2.set_emit_on_sync(false);
sync_buf2.sputn(expected.data(), expected.size());
sync_buf1.swap(sync_buf2);
assert(sstr1.str().empty());
assert(sstr2.str().empty());
sync_buf1.pubsync();
assert(sstr1.str().empty());
assert(sstr2.str().empty());
sync_buf2.pubsync();
assert(sstr1.str().empty());
assert(sstr2.str().empty());
}
assert(sstr1.str().size() == 1);
assert(sstr1.str()[0] == CharT('A'));
assert(sstr2.str() == expected);
}
{ // false true
std::basic_stringbuf<CharT> sstr1;
std::basic_stringbuf<CharT> sstr2;
std::basic_string<CharT> expected(42, CharT('*')); // a long string
{
std::basic_syncbuf<CharT> sync_buf1(&sstr1);
sync_buf1.set_emit_on_sync(true);
sync_buf1.sputc(CharT('A')); // a short string
std::basic_syncbuf<CharT> sync_buf2(&sstr2);
sync_buf2.set_emit_on_sync(false);
sync_buf2.sputn(expected.data(), expected.size());
sync_buf1.swap(sync_buf2);
assert(sstr1.str().empty());
assert(sstr2.str().empty());
sync_buf1.pubsync();
assert(sstr1.str().empty());
assert(sstr2.str().empty());
sync_buf2.pubsync();
assert(sstr1.str().size() == 1);
assert(sstr1.str()[0] == CharT('A'));
assert(sstr2.str().empty());
}
assert(sstr1.str().size() == 1);
assert(sstr1.str()[0] == CharT('A'));
assert(sstr2.str() == expected);
}
{ // true false
std::basic_stringbuf<CharT> sstr1;
std::basic_stringbuf<CharT> sstr2;
std::basic_string<CharT> expected(42, CharT('*')); // a long string
{
std::basic_syncbuf<CharT> sync_buf1(&sstr1);
sync_buf1.set_emit_on_sync(false);
sync_buf1.sputc(CharT('A')); // a short string
std::basic_syncbuf<CharT> sync_buf2(&sstr2);
sync_buf2.set_emit_on_sync(true);
sync_buf2.sputn(expected.data(), expected.size());
sync_buf1.swap(sync_buf2);
assert(sstr1.str().empty());
assert(sstr2.str().empty());
sync_buf1.pubsync();
assert(sstr1.str().empty());
assert(sstr2.str() == expected);
sync_buf2.pubsync();
assert(sstr1.str().empty());
assert(sstr2.str() == expected);
}
assert(sstr1.str().size() == 1);
assert(sstr1.str()[0] == CharT('A'));
assert(sstr2.str() == expected);
}
{ // true true
std::basic_stringbuf<CharT> sstr1;
std::basic_stringbuf<CharT> sstr2;
std::basic_string<CharT> expected(42, CharT('*')); // a long string
{
std::basic_syncbuf<CharT> sync_buf1(&sstr1);
sync_buf1.set_emit_on_sync(true);
sync_buf1.sputc(CharT('A')); // a short string
std::basic_syncbuf<CharT> sync_buf2(&sstr2);
sync_buf2.set_emit_on_sync(true);
sync_buf2.sputn(expected.data(), expected.size());
sync_buf1.swap(sync_buf2);
assert(sstr1.str().empty());
assert(sstr2.str().empty());
sync_buf1.pubsync();
assert(sstr1.str().empty());
assert(sstr2.str() == expected);
sync_buf2.pubsync();
assert(sstr1.str().size() == 1);
assert(sstr1.str()[0] == CharT('A'));
assert(sstr2.str() == expected);
}
assert(sstr1.str().size() == 1);
assert(sstr1.str()[0] == CharT('A'));
assert(sstr2.str() == expected);
}
}
template <class CharT>
static void test() {
test_basic<CharT>();
test_emit_on_sync<CharT>();
test_short_write_after_swap<CharT>();
test_long_write_after_swap<CharT>();
}
int main(int, char**) {
test<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<wchar_t>();
#endif
return 0;
}
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