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 30 int 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(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(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(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(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