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
57 lines
1.4 KiB
C++
57 lines
1.4 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: 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_syncbuf;
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// protected:
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// [syncstream.syncbuf.virtuals], overridden virtual functions
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// int sync() override;
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#include <syncstream>
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#include <sstream>
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#include <ostream>
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#include <cassert>
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#include "test_macros.h"
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template <class CharT>
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void test_sync(bool emit_on_sync) {
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std::basic_stringbuf<CharT> base;
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std::basic_syncbuf<CharT> buff(&base);
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std::basic_ostream<CharT> out(&buff);
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buff.set_emit_on_sync(emit_on_sync);
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out << 'a';
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out.flush(); // This is an indirect call to sync.
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if (emit_on_sync) {
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assert(base.str().size() == 1);
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assert(base.str()[0] == CharT('a'));
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} else
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assert(base.str().empty());
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}
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int main(int, char**) {
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test_sync<char>(true);
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test_sync<char>(false);
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test_sync<wchar_t>(true);
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test_sync<wchar_t>(false);
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#endif
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return 0;
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}
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