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std::basic_filebuf::swap

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< cpp‎ | io‎ | basic filebuf
Revision as of 10:03, 27 June 2013 by SuperBoi45 (Talk | contribs)

void swap( std::basic_filebuf& rhs )
(since C++11)

Swaps the state and the contents of *this and rhs.

Contents

Parameters

rhs - another basic_filebuf

Return value

(none)

Notes

This function is called automatically when swapping std::fstream objects, it is rarely necessary to call it directly.

Example

#include <fstream>
#include <string>
#include <iostream>
 
int main()
{
    std::ifstream fin("test.in"); // read-only
    std::ofstream fout("test.out"); // write-only
 
    std::string s;
    getline(fin, s);
    std::cout << s << '\n'; // outputs the first line of test.in
 
    fin.rdbuf()->swap(*fout.rdbuf()); //swap the underlying buffers
 
    getline(fin, s); // fails: cannot read from a write-only filebuf
    std::cout << s << '\n'; // prints empty line
}


See also

(C++11)
assigns a basic_filebuf object
(public member function) [edit]
specializes the std::swap algorithm
(function template) [edit]
(C++11)
swaps two file streams
(public member function of std::basic_fstream) [edit]