102 lines
3 KiB
C++
102 lines
3 KiB
C++
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//===----------------------------------------------------------------------===//
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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_osyncstream;
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// basic_osyncstream& operator=(basic_osyncstream&& rhs);
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#include <syncstream>
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#include <sstream>
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#include <cassert>
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#include "test_macros.h"
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#include "test_allocator.h"
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template <class CharT, bool propagate>
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static void test() {
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using Traits = std::char_traits<CharT>;
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using Allocator = std::conditional_t<propagate, other_allocator<CharT>, test_allocator<CharT>>;
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static_assert(std::allocator_traits<Allocator>::propagate_on_container_move_assignment::value == propagate);
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using OS = std::basic_osyncstream<CharT, Traits, Allocator>;
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std::basic_stringbuf<CharT, Traits, Allocator> base1;
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std::basic_stringbuf<CharT, Traits, Allocator> base2;
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{
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OS out1{&base1, Allocator{42}};
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assert(out1.get_wrapped() == &base1);
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typename OS::syncbuf_type* sb1 = out1.rdbuf();
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assert(sb1->get_wrapped() == &base1);
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assert(sb1->get_allocator().get_data() == 42);
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out1 << CharT('A');
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static_assert(!noexcept(out1.operator=(std::move(out1)))); // LWG-3867
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OS out2{&base2, Allocator{99}};
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out2 << CharT('Z');
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// Validate the data is still in the syncbuf and not in the stringbuf.
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assert(base1.str().empty());
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assert(base2.str().empty());
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out2 = std::move(out1);
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// Since sb2 is overwritten by the move its data should be in its stringbuf.
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assert(base1.str().empty());
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assert(base2.str().size() == 1);
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assert(base2.str()[0] == CharT('Z'));
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assert(out2.get_wrapped() == &base1);
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typename OS::syncbuf_type* sb2 = out2.rdbuf();
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assert(sb2->get_wrapped() == &base1);
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if constexpr (std::allocator_traits<Allocator>::propagate_on_container_move_assignment::value)
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assert(sb2->get_allocator().get_data() == 42);
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else
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assert(sb2->get_allocator().get_data() == 99);
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assert(out1.get_wrapped() == nullptr);
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assert(sb1->get_wrapped() == nullptr);
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// The data written to 2 will be stored in sb1. The write happens after the destruction.
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out2 << CharT('B');
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assert(base1.str().empty());
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}
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assert(base1.str().size() == 2);
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assert(base1.str()[0] == CharT('A'));
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assert(base1.str()[1] == CharT('B'));
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assert(base2.str().size() == 1);
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assert(base2.str()[0] == CharT('Z'));
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}
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template <class CharT>
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static void test() {
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test<CharT, true>();
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test<CharT, false>();
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}
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int main(int, char**) {
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test<char>();
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test<wchar_t>();
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#endif
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return 0;
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}
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