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_fstream
13
14// void open(const char* s, ios_base::openmode mode = ios_base::in|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::fstream fs;
31 assert(!fs.is_open());
32 fs.open(s: temp.c_str(), mode: std::ios_base::in | std::ios_base::out
33 | std::ios_base::trunc);
34 assert(fs.is_open());
35 double x = 0;
36 fs << 3.25;
37 fs.seekg(0);
38 fs >> x;
39 assert(x == 3.25);
40 }
41 std::remove(filename: temp.c_str());
42
43#ifndef TEST_HAS_NO_WIDE_CHARACTERS
44 {
45 std::wfstream fs;
46 assert(!fs.is_open());
47 fs.open(s: temp.c_str(), mode: std::ios_base::in | std::ios_base::out
48 | std::ios_base::trunc);
49 assert(fs.is_open());
50 double x = 0;
51 fs << 3.25;
52 fs.seekg(0);
53 fs >> x;
54 assert(x == 3.25);
55 }
56 std::remove(filename: temp.c_str());
57#endif
58
59#if TEST_STD_VER >= 23
60 // Test all the noreplace flag combinations
61 {
62 std::ios_base::openmode modes[] = {
63 std::ios_base::out | std::ios_base::noreplace,
64 std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace,
65 std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace,
66 std::ios_base::out | std::ios_base::noreplace | std::ios_base::binary,
67 std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace | std::ios_base::binary,
68 std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace |
69 std::ios_base::binary,
70 };
71 for (auto mode : modes) {
72 std::string tmp = get_temp_file_name(); // also creates the file
73
74 {
75 std::fstream f;
76 f.open(tmp.c_str(), mode);
77 assert(!f.is_open()); // since it already exists
78 }
79
80 {
81 std::remove(tmp.c_str());
82
83 std::fstream f;
84 f.open(tmp.c_str(), mode);
85 assert(f.is_open()); // since it doesn't exist
86 }
87 }
88
89# ifndef TEST_HAS_NO_WIDE_CHARACTERS
90 for (auto mode : modes) {
91 std::string tmp = get_temp_file_name(); // also creates the file
92
93 {
94 std::wfstream f;
95 f.open(tmp.c_str(), mode);
96 assert(!f.is_open()); // since it already exists
97 }
98
99 {
100 std::remove(tmp.c_str());
101
102 std::wfstream f;
103 f.open(tmp.c_str(), mode);
104 assert(f.is_open()); // since it doesn't exist
105 }
106 }
107# endif
108 }
109#endif // TEST_STD_VER >= 23
110
111 return 0;
112}
113

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