std::basic_streambuf::uflow
| int_type uflow(); |
||
Ensures that at least one character is available in the input area by updating the pointers to the input area (if needed). On success returns the value of that character and advances the value of the get pointer by one character. On failure returns traits::eof().
The function may update gptr, egptr and eback pointers to define the location of newly loaded data (if any). On failure, the function ensures that either gptr() == nullptr or gptr() == egptr.
The base class version of the function calls underflow. The derived classes may override this function to allow updates to the get area in the case of exhaustion.
Contents |
[edit] Parameters
(none)
[edit] Return value
The value of the character that was pointed to by the get pointer before it was advanced by one, or traits::eof() otherwise.
The base class version of the function returns the value returned by underflow.
[edit] Note
The public functions of std::streambuf call this function only if gptr() == nullptr or gptr() >= egptr().
[edit] Example
| This section is incomplete Reason: no example |
[edit] See also
| [virtual] |
reads characters from the associated input sequence to the get area (virtual protected member function) |
| [virtual] |
writes characters to the associated output sequence from the put area (virtual protected member function) |
