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
145 lines
2.9 KiB
C++
145 lines
2.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: no-localization
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// UNSUPPORTED: no-threads
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// UNSUPPORTED: libcpp-has-no-experimental-syncstream
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// <syncstream>
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// template <class charT, class traits, class Allocator>
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// class basic_osyncstream;
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// The test writes all elements in test_strings in a random order in ss. Every
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// write is done by an osyncstream. This means the output is in random order,
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// but the words should be written without interleaving. To increment the
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// change of interleaving words are written one character at a time.
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#include <cassert>
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#include <chrono>
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#include <mutex>
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#include <sstream>
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#include <string>
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#include <syncstream>
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#include <thread>
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#include <unordered_set>
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#include <vector>
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#include "test_macros.h"
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static std::ostringstream ss;
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static std::unordered_multiset<std::string> test_strings = {
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"C++ ",
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"is ",
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"a ",
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"general-purpose ",
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"programming ",
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"language ",
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"created ",
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"by ",
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"Bjarne ",
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"Stroustrup ",
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"as ",
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"an ",
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"extension ",
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"of ",
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"the ",
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"C ",
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"programming ",
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"language, ",
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"or ",
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"C ",
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"with ",
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"Classes. ",
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"The ",
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"language ",
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"has ",
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"expanded ",
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"significantly ",
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"over ",
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"time, ",
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"and ",
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"modern ",
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"C++ ",
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"has ",
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"object-oriented, ",
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"generic, ",
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"and ",
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"functional ",
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"features ",
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"in ",
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"addition ",
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"to ",
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"facilities ",
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"for ",
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"low-level ",
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"memory ",
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"manipulation. ",
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"It ",
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"is ",
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"almost ",
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"always ",
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"implemented ",
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"as ",
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"a ",
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"compiled ",
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"language, ",
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"and ",
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"many ",
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"vendors ",
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"provide ",
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"C++ ",
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"compilers, ",
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"including ",
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"the ",
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"Free ",
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"Software ",
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"Foundation, ",
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"LLVM, ",
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"Microsoft, ",
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"Intel, ",
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"and ",
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"IBM, ",
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"so ",
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"it ",
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"is ",
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"available ",
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"on ",
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"many ",
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"platforms."};
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void f(std::string text) {
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std::osyncstream out(ss);
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for (char c : text)
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out << c;
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}
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void test() {
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ss = std::basic_ostringstream<char>();
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std::vector<std::thread> threads;
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for (std::string const& word : test_strings)
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threads.push_back(std::thread(f, word));
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for (auto& thread : threads)
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thread.join();
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std::string output = ss.str();
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for (const std::string& word : test_strings)
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assert(output.find(word) != std::string::npos);
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}
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int main(int, char**) {
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// The more we test, the more likely we catch an error
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for (size_t i = 0; i < 1024; ++i)
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test();
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return 0;
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}
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