7cc72a0a2e
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
61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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: no-threads
|
|
// UNSUPPORTED: libcpp-has-no-experimental-syncstream
|
|
|
|
// <syncstream>
|
|
|
|
// template <class charT, class traits, class Allocator>
|
|
// class basic_osyncstream;
|
|
|
|
// Basic test whether the code works in a threaded environment.
|
|
// Using timing the output order should be stable.
|
|
// several_threads.pass.cpp tests with more threads.
|
|
|
|
#include <syncstream>
|
|
#include <sstream>
|
|
#include <mutex>
|
|
#include <thread>
|
|
#include <cassert>
|
|
#include <iostream>
|
|
|
|
#include "test_macros.h"
|
|
|
|
static std::basic_ostringstream<char> ss;
|
|
static const char a = 'a';
|
|
static const char b = 'b';
|
|
static const char c = 'c';
|
|
static const char d = 'd';
|
|
|
|
void f1() {
|
|
std::basic_osyncstream<char> out(ss);
|
|
out << a;
|
|
std::this_thread::sleep_for(std::chrono::milliseconds(250));
|
|
out << b;
|
|
}
|
|
|
|
void f2() {
|
|
std::basic_osyncstream<char> out(ss);
|
|
out << c;
|
|
out << d;
|
|
}
|
|
|
|
int main(int, char**) {
|
|
std::thread t1(f1);
|
|
std::thread t2(f2);
|
|
t1.join();
|
|
t2.join();
|
|
|
|
assert(ss.str() == "cdab");
|
|
|
|
return 0;
|
|
}
|