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Subject: RE: ctype index?
Date: Thu, 5 Apr 2007 09:27:09 -0600
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Thread-Topic: ctype index?
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From: "Scott Zhong" <scottz@roguewave.com>
To: <stdcxx-dev@incubator.apache.org>
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Right now it is comparing pointer addresses?  __lo and __hi are pointers
and the operation <  for(; __lo < __hi; ++__lo; ++__hi)  > would step
through until the memory address __lo is greater than or equal to __hi?

Yu (Scott) Zhong
Consulting Engineer
Rogue Wave Software, a Quovadxtm division
scottz@roguewave.com
ph: 303 545 3182
=20

-----Original Message-----
From: Martin Sebor [mailto:sebor@roguewave.com]=20
Sent: Wednesday, April 04, 2007 5:29 PM
To: stdcxx-dev@incubator.apache.org
Subject: Re: ctype index?

Scott Zhong wrote:
> in the for loop, why __lo char_type length isn't being tested?

I'm not sure what you mean. What length isn't being tested
and why should it be?

Martin

>=20
> in _ctype.cc line 141:
>=20
> template <class _CharT>
> /* virtual */ const _TYPENAME ctype<_CharT>::char_type*
> ctype<_CharT>::
> do_narrow (const char_type *__lo, const char_type *__hi,
>            char __dfault, char *__dest) const
> {
>     _RWSTD_ASSERT (__lo <=3D __hi);
>     _RWSTD_ASSERT (!__lo || __dest);
>=20
>     for (; __lo < __hi; ++__lo, ++__dest)
>         *__dest =3D narrow (*__lo, __dfault);
>=20
>     return __hi;
> }
>=20
>=20
> Yu (Scott) Zhong
>=20
>=20