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std::basic_filebuf<CharT,Traits>::operator=

From cppreference.com
< cpp‎ | io‎ | basic filebuf
 
C++
 
Input/output library
 
std::basic_filebuf
 
(1) (since C++11)
std::basic_filebuf& operator=( const std::basic_filebuf& rhs ) = delete;
 (2)

Assigns another basic_filebuf object.

1) First calls close() to close the associated file, then moves the contents of rhs into *this: the put and get buffers, the associated file, the locale, the openmode, the is_open flag, and any other state. After the move, rhs is not associated with a file and rhs.is_open() == false.
2) The copy assignment operator is deleted; basic_filebuf is not CopyAssignable.

Contents

[edit] Parameters

rhs - another basic_filebuf that will be moved from

[edit] Return value

*this

[edit] Example

Run this code
#include <cassert>
#include <fstream>
#include <iostream>
#include <string>
 
int main()
{
    std::ofstream{"test.in"} << "test\n"; / writes via a temporary object
    std::ifstream fin("test.in"); / read-only stream
    std::ofstream fout("test.out"); / write-only stream
 
    std::string s;
    std::getline(fin, s);
    std::cout << "s = [" << s << "]\n"; / s contains "test"
 
    assert(fout.is_open();
    *fin.rdbuf() = std::move(*fout.rdbuf();
    assert(!fout.is_open();
 
    std::getline(fin, s);
    std::cout << "s = [" << s << "]\n"; / s is empty input
}

Output: 

s = [test]
s = []

[edit] See also

 constructs a basic_filebuf object
(public member function) [edit]
(C++11)
 swaps two basic_filebuf objects
(public member function) [edit]
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