| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <fstream> |
| |
| // template <class charT, class traits = char_traits<charT> > |
| // class basic_ofstream |
| |
| // void swap(basic_ofstream& rhs); |
| |
| #include <fstream> |
| #include <utility> |
| #include <cassert> |
| #include "platform_support.h" |
| |
| std::pair<std::string, std::string> get_temp_file_names() { |
| std::pair<std::string, std::string> names; |
| names.first = get_temp_file_name(); |
| |
| // Create the file so the next call to `get_temp_file_name()` doesn't |
| // return the same file. |
| std::FILE *fd1 = std::fopen(names.first.c_str(), "w"); |
| |
| names.second = get_temp_file_name(); |
| assert(names.first != names.second); |
| |
| std::fclose(fd1); |
| std::remove(names.first.c_str()); |
| |
| return names; |
| } |
| |
| int main() |
| { |
| std::pair<std::string, std::string> temp_files = get_temp_file_names(); |
| std::string& temp1 = temp_files.first; |
| std::string& temp2 = temp_files.second; |
| assert(temp1 != temp2); |
| { |
| std::ofstream fs1(temp1.c_str()); |
| std::ofstream fs2(temp2.c_str()); |
| fs1 << 3.25; |
| fs2 << 4.5; |
| fs1.swap(fs2); |
| fs1 << ' ' << 3.25; |
| fs2 << ' ' << 4.5; |
| } |
| { |
| std::ifstream fs(temp1.c_str()); |
| double x = 0; |
| fs >> x; |
| assert(x == 3.25); |
| fs >> x; |
| assert(x == 4.5); |
| } |
| std::remove(temp1.c_str()); |
| { |
| std::ifstream fs(temp2.c_str()); |
| double x = 0; |
| fs >> x; |
| assert(x == 4.5); |
| fs >> x; |
| assert(x == 3.25); |
| } |
| std::remove(temp2.c_str()); |
| { |
| std::wofstream fs1(temp1.c_str()); |
| std::wofstream fs2(temp2.c_str()); |
| fs1 << 3.25; |
| fs2 << 4.5; |
| fs1.swap(fs2); |
| fs1 << ' ' << 3.25; |
| fs2 << ' ' << 4.5; |
| } |
| { |
| std::wifstream fs(temp1.c_str()); |
| double x = 0; |
| fs >> x; |
| assert(x == 3.25); |
| fs >> x; |
| assert(x == 4.5); |
| } |
| std::remove(temp1.c_str()); |
| { |
| std::wifstream fs(temp2.c_str()); |
| double x = 0; |
| fs >> x; |
| assert(x == 4.5); |
| fs >> x; |
| assert(x == 3.25); |
| } |
| std::remove(temp2.c_str()); |
| } |