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std::basic_filebuf::operator=(3) | C++ Standard Libary | std::basic_filebuf::operator=(3) |
NAME¶
std::basic_filebuf::operator= - std::basic_filebuf::operator=
Synopsis¶
std::basic_filebuf& operator=( std::basic_filebuf&&
rhs ); (1) (since C++11)
std::basic_filebuf& operator=( const std::basic_filebuf& rhs ) =
(2)
delete;
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.
Parameters¶
rhs - another basic_filebuf that will be moved from
Return value¶
*this
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 = []
See also¶
constructor constructs a basic_filebuf object
(public member function)
swap swaps two basic_filebuf objects
(C++11) (public member function)
2024.06.10 | http://cppreference.com |