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// explicit basic_fstream(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// XFAIL: FROZEN-CXX03-HEADERS-FIXME
22
23#include <fstream>
24#include <cassert>
25
26#include "test_macros.h"
27#include "platform_support.h"
28#include "operator_hijacker.h"
29
30int main(int, char**)
31{
32 std::string temp = get_temp_file_name();
33 {
34 std::fstream fs(temp.c_str(), std::ios_base::in | std::ios_base::out
35 | std::ios_base::trunc);
36 double x = 0;
37 fs << 3.25;
38 fs.seekg(0);
39 fs >> x;
40 assert(x == 3.25);
41 }
42 std::remove(filename: temp.c_str());
43
44 {
45 std::basic_fstream<char, operator_hijacker_char_traits<char> > fs(
46 temp.c_str(), std::ios_base::in | std::ios_base::out | std::ios_base::trunc);
47 std::basic_string<char, operator_hijacker_char_traits<char> > x;
48 fs << "3.25";
49 fs.seekg(0);
50 fs >> x;
51 assert(x == "3.25");
52 }
53 std::remove(filename: temp.c_str());
54
55#ifndef TEST_HAS_NO_WIDE_CHARACTERS
56 {
57 std::wfstream fs(temp.c_str(), std::ios_base::in | std::ios_base::out
58 | std::ios_base::trunc);
59 double x = 0;
60 fs << 3.25;
61 fs.seekg(0);
62 fs >> x;
63 assert(x == 3.25);
64 }
65 std::remove(filename: temp.c_str());
66
67 {
68 std::basic_fstream<wchar_t, operator_hijacker_char_traits<wchar_t> > fs(
69 temp.c_str(), std::ios_base::in | std::ios_base::out | std::ios_base::trunc);
70 std::basic_string<wchar_t, operator_hijacker_char_traits<wchar_t> > x;
71 fs << L"3.25";
72 fs.seekg(0);
73 fs >> x;
74 assert(x == L"3.25");
75 }
76 std::remove(filename: temp.c_str());
77#endif
78
79#if TEST_STD_VER >= 23
80 // Test all the noreplace flag combinations
81 {
82 std::ios_base::openmode modes[] = {
83 std::ios_base::out | std::ios_base::noreplace,
84 std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace,
85 std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace,
86 std::ios_base::out | std::ios_base::noreplace | std::ios_base::binary,
87 std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace | std::ios_base::binary,
88 std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace |
89 std::ios_base::binary,
90 };
91 for (auto mode : modes) {
92 std::string tmp = get_temp_file_name(); // also creates the file
93
94 {
95 std::fstream f(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::fstream f(tmp.c_str(), mode);
103 assert(f.is_open()); // since it doesn't exist
104 }
105 }
106
107# ifndef TEST_HAS_NO_WIDE_CHARACTERS
108 for (auto mode : modes) {
109 std::string tmp = get_temp_file_name(); // also creates the file
110
111 {
112 std::wfstream f(tmp.c_str(), mode);
113 assert(!f.is_open()); // since it already exists
114 }
115
116 {
117 std::remove(tmp.c_str());
118
119 std::wfstream f(tmp.c_str(), mode);
120 assert(f.is_open()); // since it doesn't exist
121 }
122 }
123# endif
124 }
125#endif // TEST_STD_VER >= 23
126
127 return 0;
128}
129

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