std::basic_ofstream<CharT,Traits>::swap - cppreference.com (original) (raw)

| void swap( basic_ofstream& other ); | | (since C++11) | | ------------------------------------ | | ------------- |

Exchanges the state of the stream with those of other.

This is done by calling basic_ostream<CharT, Traits>::swap(other) and rdbuf()->swap(other.rdbuf()).

[edit] Parameters

[edit] Return value

(none)

[edit] Exceptions

May throw implementation-defined exceptions.

[edit] Example

#include #include #include #include   bool create_stream(std::fstream& fs, const std::string& path) { try { std::fstream ts{path, ts.trunc | ts.in | ts.out}; if (ts.is_open()) { ts.swap(fs); // stream objects are not copyable return true; } } catch (...) { std::cout << "Exception!\n"; } return false; }   void use_stream(std::fstream& fs) { fs.seekg(0); std::string data; fs >> data; std::cout << "data: " << std::quoted(data) << '\n'; }   int main() { std::fstream fs; std::string path = "/tmp/test_file.txt"; if (create_stream(fs, path)) { fs.write(path.c_str(), path.length()); use_stream(fs); } }

Possible output:

data: "/tmp/test_file.txt"

[edit] See also

| | moves the file stream (public member function) [edit] | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | swaps two basic_filebuf objects (public member function of std::basic_filebuf<CharT,Traits>) [edit] |