From: "Tim \"Zastai\" Van Holder" <zastai AT hotmail DOT com>
Newsgroups: comp.os.msdos.djgpp
References: <393c50ca DOT 34140115 AT news DOT tesco DOT net>
Subject: Re: Problem with DJGPP implementation of namespaces?
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Date: Wed, 28 Jun 2000 18:21:48 GMT
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To: djgpp AT delorie DOT com
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Paul Bibbings <paul DOT bibbings AT tesco DOT net> wrote in message
news:<393c50ca DOT 34140115 AT news DOT tesco DOT net>...
> I have used the following short program to investigate in a simple
> form a problem I've been having with calling isdigit() from the std
> namespace in DJGPP. Okay, I am not a seasoned C++ programmer, but
> there seems to be an inconsistency in the way in which DJGPP will
> accept use of isdigit().

You're right, there is some inconsistency in which GCC handles the 'std'
namespace. In fact, by default, it doesn't handle the 'std' namespace at
all; only if the -fhonor-std flag is given will 'std' actually be used (and
if you use -fhonor-std, you must also have used that flag for EVRY library
used by gcc, including libgcc). I suspect there is a bug in gcc relating to
this (it translates std::foo to ::foo, and using ::isdigit also fails, which
it certainly shouldn't).
As to why strlen DOES work, I believe strlen is a builtin for gcc 2.95 (and
possibly 2.8.1 as well); see gcc/c-decl.c in the gcc sources. As such, gcc
would probably ignore the namespace prefix and use its builtin instead.
In any case, the usual behaviour in regular sources using C++ is to put a
'using namespace std;' after all includes, and overriding scoping when
required (ie rarely). The only exception would pobably be if you have a
namespace replacing may symbols from namespace std.

Zastai