Consumes data from the buffer; writes to the controlled sequence.
Synopsis
Declared in <bslstl_syncbuf.h>
virtual
int_type
overflow(int_type __c = traits_type::eof());Description
Informally, this function is called when the output buffer is full (or does not exist, as buffering need not actually be done). If a buffer exists, it is consumed, with some effect on the controlled sequence. (Typically, the buffer is written out to the sequence verbatim.) In either case, the character c is also written out, if __c is not eof().
For a formal definition of this function, see a good text such as Langer & Kreft, or [27.5.2.4.5]/3‐7.
A functioning output streambuf can be created by overriding only this function (no buffer area will be used).
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Note
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Base class version does nothing, returns eof(). |
Return Value
eof() to indicate failure, something else (usually __c, or not_eof())
Parameters
Name |
Description |
__c |
An additional character to consume. |
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