From:	"Lawrence Rust" <lvr AT softsystem DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
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Subject:	Re: scan() in c++
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Date:	Mon, 10 Feb 2003 11:17:56 -0000
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

"yc" wrote...
> I find the following sentence in fstream.h
>     class fstream : public fstreambase, public iostream {
>
> and
>
>     class iostream : public istream, public ostream
>     istream& scan(const char *format ...);
> in iostream.h,
>
>
> and
> TIOBase::TIOBase() {
>   pFile = new fstream();
> }
> in IOBase.cpp.
>
> The scan method seems existing. How to implement it? And need I
> include IOBase.cpp when compiling LSTM.cpp?

The C++ I/O stream library was extensively modified during the ANSI
standards process with the result that functions like istream::scan were not
included.  Most compilers, including gcc, offer some form of backwards
compatibility but there are significant limitations.  NB you should not use
old .h C++ library headers in new programs as these were deprecated with the
release of ISO 14882.

Consequently you will need to implement your own function that replaces
istream::scan.  Typically this can be done with the standard formatted input
operations like >>, get and getline.

HTH

-- Lawrence Rust, Software Systems, www.softsystem.co.uk
The problem with Windows XP: http://www.arachnoid.com/boycott

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