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 #include <fstream> 22 #include <cassert> 23 24 #include "test_macros.h" 25 #include "platform_support.h" 26 #include "operator_hijacker.h" 27 28 int main(int, char**) 29 { 30 std::string temp = get_temp_file_name(); 31 { 32 std::fstream fs(temp.c_str(), std::ios_base::in | std::ios_base::out 33 | std::ios_base::trunc); 34 double x = 0; 35 fs << 3.25; 36 fs.seekg(0); 37 fs >> x; 38 assert(x == 3.25); 39 } 40 std::remove(temp.c_str()); 41 42 { 43 std::basic_fstream<char, operator_hijacker_char_traits<char> > fs( 44 temp.c_str(), std::ios_base::in | std::ios_base::out | std::ios_base::trunc); 45 std::basic_string<char, operator_hijacker_char_traits<char> > x; 46 fs << "3.25"; 47 fs.seekg(0); 48 fs >> x; 49 assert(x == "3.25"); 50 } 51 std::remove(temp.c_str()); 52 53 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 54 { 55 std::wfstream fs(temp.c_str(), std::ios_base::in | std::ios_base::out 56 | std::ios_base::trunc); 57 double x = 0; 58 fs << 3.25; 59 fs.seekg(0); 60 fs >> x; 61 assert(x == 3.25); 62 } 63 std::remove(temp.c_str()); 64 65 { 66 std::basic_fstream<wchar_t, operator_hijacker_char_traits<wchar_t> > fs( 67 temp.c_str(), std::ios_base::in | std::ios_base::out | std::ios_base::trunc); 68 std::basic_string<wchar_t, operator_hijacker_char_traits<wchar_t> > x; 69 fs << L"3.25"; 70 fs.seekg(0); 71 fs >> x; 72 assert(x == L"3.25"); 73 } 74 std::remove(temp.c_str()); 75 #endif 76 77 #if TEST_STD_VER >= 23 78 // Test all the noreplace flag combinations 79 { 80 std::ios_base::openmode modes[] = { 81 std::ios_base::out | std::ios_base::noreplace, 82 std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace, 83 std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace, 84 std::ios_base::out | std::ios_base::noreplace | std::ios_base::binary, 85 std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace | std::ios_base::binary, 86 std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::noreplace | 87 std::ios_base::binary, 88 }; 89 for (auto mode : modes) { 90 std::string tmp = get_temp_file_name(); // also creates the file 91 92 { 93 std::fstream f(tmp.c_str(), mode); 94 assert(!f.is_open()); // since it already exists 95 } 96 97 { 98 std::remove(tmp.c_str()); 99 100 std::fstream f(tmp.c_str(), mode); 101 assert(f.is_open()); // since it doesn't exist 102 } 103 } 104 105 # ifndef TEST_HAS_NO_WIDE_CHARACTERS 106 for (auto mode : modes) { 107 std::string tmp = get_temp_file_name(); // also creates the file 108 109 { 110 std::wfstream f(tmp.c_str(), mode); 111 assert(!f.is_open()); // since it already exists 112 } 113 114 { 115 std::remove(tmp.c_str()); 116 117 std::wfstream f(tmp.c_str(), mode); 118 assert(f.is_open()); // since it doesn't exist 119 } 120 } 121 # endif 122 } 123 #endif // TEST_STD_VER >= 23 124 125 return 0; 126 } 127