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// <ostream>
10
11// template <class charT, class traits = char_traits<charT> >
12// class basic_ostream;
13
14// template <class charT, class traits>
15// basic_ostream<charT,traits>& flush(basic_ostream<charT,traits>& os);
16
17#include <ostream>
18#include <cassert>
19
20#include "test_macros.h"
21
22int sync_called = 0;
23
24template <class CharT>
25class testbuf
26 : public std::basic_streambuf<CharT>
27{
28public:
29 testbuf()
30 {
31 }
32
33protected:
34
35 virtual int
36 sync()
37 {
38 ++sync_called;
39 return 0;
40 }
41};
42
43int main(int, char**)
44{
45 {
46 testbuf<char> sb;
47 std::ostream os(&sb);
48 std::flush(os);
49 assert(sync_called == 1);
50 assert(os.good());
51 }
52#ifndef TEST_HAS_NO_WIDE_CHARACTERS
53 {
54 testbuf<wchar_t> sb;
55 std::wostream os(&sb);
56 std::flush(os);
57 assert(sync_called == 2);
58 assert(os.good());
59 }
60#endif
61
62 return 0;
63}
64

source code of libcxx/test/std/input.output/iostream.format/output.streams/ostream.manip/flush.pass.cpp