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std::basic_streambuf::showmanyc

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< cpp‎ | io‎ | basic streambuf
Revision as of 08:59, 15 August 2013 by P12 (Talk | contribs)

 
 
 
 
protected:
virtual std::streamsize showmanyc();

Estimates the number of characters available for input in the associated character sequence. underflow() is guaranteed not to return Traits::eof() until at least that many characters are extracted.

Contents

Parameters

(none)

Return value

The number of characters that are certainly available in the associated character sequence, or -1 if showmanyc can determine, without blocking, that no characters are available. If showmanyc returns -1, underflow() and uflow() will definitely return Traits::eof.

The base class version returns 0, which has the meaning of "unsure if there are characters available in the associated sequence".

Example

See also

obtains the number of characters immediately available in the get area
(public member function) [edit]
[virtual]
optionally provides the number of characters available for input from the file
(virtual protected member function of std::basic_filebuf) [edit]