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// <fstream>
10
11// template <class charT, class traits = char_traits<charT> >
12// class basic_ofstream
13
14// void open(const char* s, ios_base::openmode mode = ios_base::out);
15
16// In C++23 and later, this test requires support for P2467R1 in the dylib (a3f17ba3febbd546f2342ffc780ac93b694fdc8d)
17// XFAIL: (!c++03 && !c++11 && !c++14 && !c++17 && !c++20) && using-built-library-before-llvm-18
18
19// XFAIL: LIBCXX-AIX-FIXME
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 temp = get_temp_file_name();
29 {
30 std::ofstream fs;
31 assert(!fs.is_open());
32 char c = 'a';
33 fs << c;
34 assert(fs.fail());
35 fs.open(s: temp.c_str());
36 assert(fs.is_open());
37 fs << c;
38 }
39 {
40 std::ifstream fs(temp.c_str());
41 char c = 0;
42 fs >> c;
43 assert(c == 'a');
44 }
45 std::remove(filename: temp.c_str());
46
47#ifndef TEST_HAS_NO_WIDE_CHARACTERS
48 {
49 std::wofstream fs;
50 assert(!fs.is_open());
51 wchar_t c = L'a';
52 fs << c;
53 assert(fs.fail());
54 fs.open(s: temp.c_str());
55 assert(fs.is_open());
56 fs << c;
57 }
58 {
59 std::wifstream fs(temp.c_str());
60 wchar_t c = 0;
61 fs >> c;
62 assert(c == L'a');
63 }
64 std::remove(filename: temp.c_str());
65#endif
66
67#if TEST_STD_VER >= 23
68 // Test all the noreplace flag combinations
69 {
70 std::ios_base::openmode modes[] = {
71 std::ios_base::out | std::ios_base::noreplace,
72 std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace,
73 std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace,
74 std::ios_base::out | std::ios_base::noreplace | std::ios_base::binary,
75 std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace | std::ios_base::binary,
76 std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace |
77 std::ios_base::binary,
78 };
79 for (auto mode : modes) {
80 std::string tmp = get_temp_file_name(); // also creates the file
81
82 {
83 std::ofstream f;
84 f.open(tmp.c_str(), mode);
85 assert(!f.is_open()); // since it already exists
86 }
87
88 {
89 std::remove(tmp.c_str());
90
91 std::ofstream f;
92 f.open(tmp.c_str(), mode);
93 assert(f.is_open()); // since it doesn't exist
94 }
95 }
96
97# ifndef TEST_HAS_NO_WIDE_CHARACTERS
98 for (auto mode : modes) {
99 std::string tmp = get_temp_file_name(); // also creates the file
100
101 {
102 std::wofstream f;
103 f.open(tmp.c_str(), mode);
104 assert(!f.is_open()); // since it already exists
105 }
106 {
107 std::remove(tmp.c_str());
108
109 std::wofstream f;
110 f.open(tmp.c_str(), mode);
111 assert(f.is_open()); // since it doesn't exist
112 }
113 }
114# endif
115 }
116#endif // TEST_STD_VER >= 23
117
118 return 0;
119}
120

source code of libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_pointer.pass.cpp