std::basic_ios<CharT,Traits>::rdbuf
From cppreference.com
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std::basic_streambuf
<CharT, Traits>
* rdbuf(
)
const
;
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(1) | |
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std::basic_streambuf
<CharT, Traits>
* rdbuf(
std::basic_streambuf
<CharT, Traits>
* sb )
;
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(2) | |
Manages the associated stream buffer.
1) Returns the associated stream buffer. If there is no associated stream buffer, returns a null pointer.
Parameters
| sb | - | Stream buffer to associate to. |
Return value
The associated stream buffer, or a null pointer if there was no associated stream buffer.
Exceptions
May throw implementation-defined exceptions.
Example
Run this code
#include <iostream> #include <sstream> int main() { std::ostringstream local; auto cout_buff = std::cout.rdbuf(); // save pointer to std::cout buffer std::cout.rdbuf(local.rdbuf()); // substitute internal std::cout buffer with // buffer of 'local' object // now std::cout work with 'local' buffer // you don't see this message std::cout << "some message"; // go back to old buffer std::cout.rdbuf(cout_buff); // you will see this message std::cout << "back to default buffer\n"; // print 'local' content std::cout << "local content: " << local.str() << "\n"; }
Output:
back to default buffer local content: some message
See also
replaces the rdbuf without clearing its error state (protected member function) |