std::basic_filebuf<CharT,Traits>::operator=
From cppreference.com
< cpp | io | basic filebuf
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Input/output library
Print functions (C++23)
Buffers
(C++23)
(C++98/26*)
(C++20)
Streams
Abstractions
File I/O
String I/O
Array I/O
(C++23)
(C++23)
(C++23)
(C++98/26*)
(C++98/26*)
(C++98/26*)
Synchronized Output
(C++20)
Types
Error category interface
(C++11)
(C++11)
std::basic_filebuf
Public member functions
basic_filebuf::operator=
(C++11)
(C++11)
(C++26)
Protected member functions
Non-member functions
(C++11)
std::basic_filebuf & operator=( std::basic_filebuf && rhs );
(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.
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 = []