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// REQUIRES: locale.en_US.UTF-8
10
11// <ios>
12
13// class ios_base
14
15// void register_callback(event_callback fn, int index);
16
17#include <ios>
18#include <string>
19#include <locale>
20#include <cassert>
21
22#include "test_macros.h"
23#include "platform_support.h" // locale name macros
24
25class test
26 : public std::ios
27{
28public:
29 test()
30 {
31 init(sb: 0);
32 }
33};
34
35int f1_called = 0;
36
37void f1(std::ios_base::event ev, std::ios_base& stream, int index)
38{
39 if (ev == std::ios_base::imbue_event)
40 {
41 assert(stream.getloc().name() == LOCALE_en_US_UTF_8);
42 assert(index == 4);
43 ++f1_called;
44 }
45}
46
47int main(int, char**)
48{
49 test t;
50 std::ios_base& b = t;
51 b.register_callback(fn: f1, index: 4);
52 b.register_callback(fn: f1, index: 4);
53 b.register_callback(fn: f1, index: 4);
54 std::locale l = b.imbue(std::locale(LOCALE_en_US_UTF_8));
55 assert(f1_called == 3);
56
57 return 0;
58}
59

source code of libcxx/test/std/input.output/iostreams.base/ios.base/ios.base.callback/register_callback.pass.cpp