std::basic_stringbuf<CharT,Traits,Allocator>:: pbackfail
|
protected
:
virtual int_type pbackfail ( int_type c = Traits :: eof ( ) ) |
||
This protected virtual function is called by the public functions basic_streambuf::sungetc and basic_streambuf::sputbackc (which, in turn, are called by basic_istream::unget and basic_istream::putback ).
pbackfail()
is called with no arguments or with
Traits
::
eof
(
)
as the argument)
pbackfail()
is called with the character that needs to be put back), in which case
c
, as determined by
Traits
::
eq
(
to_char_type
(
c
)
, gptr
(
)
[
-
1
]
)
, then simply decrements
basic_streambuf::gptr()
.
c
to the location pointed to gptr() after adjustment.
Parameters
| c | - | the character to put back, or Traits::eof() to indicate that backing up of the get area is requested |
Return value
c
on success except if
c
was
Traits
::
eof
(
)
, in which case
Traits
::
not_eof
(
c
)
is returned.
Traits :: eof ( ) on failure.
Example
|
This section is incomplete
Reason: no example |
See also
|
[virtual]
|
puts a character back into the input sequence, possibly modifying the input sequence
(virtual protected member function of
std::basic_streambuf<CharT,Traits>
)
|
|
moves the next pointer in the input sequence back by one
(public member function of
std::basic_streambuf<CharT,Traits>
)
|
|
|
puts one character back in the input sequence
(public member function of
std::basic_streambuf<CharT,Traits>
)
|
|
|
unextracts a character
(public member function of
std::basic_istream<CharT,Traits>
)
|
|
|
puts a character into input stream
(public member function of
std::basic_istream<CharT,Traits>
)
|