105 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// <fstream>10 11// template <class charT, class traits = char_traits<charT> >12// class basic_ofstream13 14// void swap(basic_ofstream& rhs);15 16#include <fstream>17#include <utility>18#include <cassert>19#include "test_macros.h"20#include "platform_support.h"21 22std::pair<std::string, std::string> get_temp_file_names() {23 std::pair<std::string, std::string> names;24 names.first = get_temp_file_name();25 26 // Create the file so the next call to `get_temp_file_name()` doesn't27 // return the same file.28 std::FILE *fd1 = std::fopen(names.first.c_str(), "w");29 30 names.second = get_temp_file_name();31 assert(names.first != names.second);32 33 std::fclose(fd1);34 std::remove(names.first.c_str());35 36 return names;37}38 39int main(int, char**)40{41 std::pair<std::string, std::string> temp_files = get_temp_file_names();42 std::string& temp1 = temp_files.first;43 std::string& temp2 = temp_files.second;44 assert(temp1 != temp2);45 {46 std::ofstream fs1(temp1.c_str());47 std::ofstream fs2(temp2.c_str());48 fs1 << 3.25;49 fs2 << 4.5;50 fs1.swap(fs2);51 fs1 << ' ' << 3.25;52 fs2 << ' ' << 4.5;53 }54 {55 std::ifstream fs(temp1.c_str());56 double x = 0;57 fs >> x;58 assert(x == 3.25);59 fs >> x;60 assert(x == 4.5);61 }62 std::remove(temp1.c_str());63 {64 std::ifstream fs(temp2.c_str());65 double x = 0;66 fs >> x;67 assert(x == 4.5);68 fs >> x;69 assert(x == 3.25);70 }71 std::remove(temp2.c_str());72 73#ifndef TEST_HAS_NO_WIDE_CHARACTERS74 {75 std::wofstream fs1(temp1.c_str());76 std::wofstream fs2(temp2.c_str());77 fs1 << 3.25;78 fs2 << 4.5;79 fs1.swap(fs2);80 fs1 << ' ' << 3.25;81 fs2 << ' ' << 4.5;82 }83 {84 std::wifstream fs(temp1.c_str());85 double x = 0;86 fs >> x;87 assert(x == 3.25);88 fs >> x;89 assert(x == 4.5);90 }91 std::remove(temp1.c_str());92 {93 std::wifstream fs(temp2.c_str());94 double x = 0;95 fs >> x;96 assert(x == 4.5);97 fs >> x;98 assert(x == 3.25);99 }100 std::remove(temp2.c_str());101#endif102 103 return 0;104}105