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// This tests that swapping filebufs works correctly even when the small buffer
10// optimization is in use (https://github.com/llvm/llvm-project/issues/49282).
11
12// <fstream>
13
14// template <class charT, class traits = char_traits<charT> >
15// class basic_filebuf
16
17// template <class charT, class traits>
18// void
19// swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);
20
21#include <fstream>
22#include <cassert>
23#include "test_macros.h"
24#include "platform_support.h"
25
26int main(int, char**)
27{
28 std::string tmpA = get_temp_file_name();
29 std::string tmpB = get_temp_file_name();
30
31 {
32 std::ofstream sa(tmpA), sb(tmpB);
33 sa << "AAAA";
34 sb << "BBBB";
35 }
36
37 std::filebuf f1;
38 assert(f1.open(tmpA, std::ios_base::in) != 0);
39 assert(f1.is_open());
40 f1.pubsetbuf(s: 0, n: 0);
41
42 std::filebuf f2;
43 assert(f2.open(tmpB, std::ios_base::in) != 0);
44 assert(f2.is_open());
45 f2.pubsetbuf(s: 0, n: 0);
46
47 assert(f1.sgetc() == 'A');
48 assert(f2.sgetc() == 'B');
49
50 swap(x&: f1, y&: f2);
51
52 assert(f1.is_open());
53 assert(f2.is_open());
54
55 assert(f1.sgetc() == 'B');
56 assert(f2.sgetc() == 'A');
57
58 std::remove(filename: tmpA.c_str());
59 std::remove(filename: tmpB.c_str());
60
61 return 0;
62}
63

source code of libcxx/test/std/input.output/file.streams/fstreams/filebuf.assign/nonmember_swap_min.pass.cpp