std::swap(std::basic_ofstream)
From cppreference.com
< cpp | io | basic ofstream
template<class CharT, class Traits > void swap( basic_ofstream<CharT, Traits>& lhs, basic_ofstream<CharT, Traits>& rhs ); | ||
Specializes the std::swap algorithm for std::basic_ofstream. Exchanges the state of lhs with that of rhs. Effectively calls lhs.swap(rhs).
Contents |
[edit]Parameters
| lhs, rhs | - | streams whose state to swap |
[edit]Return value
(none)
[edit]Exceptions
May throw implementation-defined exceptions.
[edit]Example
Run this code
#include <fstream>#include <iostream>#include <string> bool create_stream(std::ofstream& fs){try{std::string some_name ="/tmp/test_file.txt";std::ios_base::openmode some_flags = fs.trunc;// | other flags if(std::ofstream ts{some_name, some_flags}; ts.is_open()){std::swap(ts, fs);// stream objects are not copyable => swapreturntrue;}}catch(...){std::cout<<"Exception!\n";}returnfalse;} int main(){if(std::ofstream fs; create_stream(fs)){// use fs stream}}
[edit]See also
(C++11) | swaps two file streams (public member function) |
