1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17
10// UNSUPPORTED: no-localization
11// UNSUPPORTED: libcpp-has-no-experimental-syncstream
12
13// <syncstream>
14
15// template <class charT, class traits, class Allocator>
16// class basic_osyncstream;
17
18// void emit();
19
20#include <syncstream>
21#include <sstream>
22#include <cassert>
23
24#include "test_macros.h"
25
26template <class CharT>
27void test() {
28 using OS = std::basic_osyncstream<CharT>;
29 using SS = std::basic_ostringstream<CharT>;
30 CharT c = 'f';
31
32 SS ss;
33 OS out(ss);
34 out << c;
35 assert(ss.str().empty());
36 out.emit();
37 assert(ss.str()[0] == c);
38}
39
40int main(int, char**) {
41 test<char>();
42#ifndef TEST_HAS_NO_WIDE_CHARACTERS
43 test<wchar_t>();
44#endif
45}
46

source code of libcxx/test/std/input.output/syncstream/osyncstream/members/emit.pass.cpp