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_syncbuf;
17
18// protected:
19// [syncstream.syncbuf.virtuals], overridden virtual functions
20// int sync() override;
21
22#include <syncstream>
23#include <sstream>
24#include <ostream>
25#include <cassert>
26
27#include "test_macros.h"
28
29template <class CharT>
30void test_sync(bool emit_on_sync) {
31 std::basic_stringbuf<CharT> base;
32 std::basic_syncbuf<CharT> buff(&base);
33 std::basic_ostream<CharT> out(&buff);
34
35 buff.set_emit_on_sync(emit_on_sync);
36
37 out << 'a';
38 out.flush(); // This is an indirect call to sync.
39
40 if (emit_on_sync) {
41 assert(base.str().size() == 1);
42 assert(base.str()[0] == CharT('a'));
43 } else
44 assert(base.str().empty());
45}
46
47int main(int, char**) {
48 test_sync<char>(emit_on_sync: true);
49 test_sync<char>(emit_on_sync: false);
50#ifndef TEST_HAS_NO_WIDE_CHARACTERS
51 test_sync<wchar_t>(emit_on_sync: true);
52 test_sync<wchar_t>(emit_on_sync: false);
53#endif
54
55 return 0;
56}
57

source code of libcxx/test/std/input.output/syncstream/syncbuf/sync.pass.cpp