std::basic_filebuf<CharT,Traits>:: operator=
From cppreference.com
<
cpp
|
io
|
basic filebuf
|
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
.
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
constructs a
basic_filebuf
object
(public member function) |
|
|
(C++11)
|
swaps two
basic_filebuf
objects
(public member function) |