Re: [Dev-C++] Character variables

[Per W. <pw...@ia...>]

One more thing. I haven't a standard available right now, and a preliminar
google only picked up an old -97 preliminary C++ standard.

There you have your multicharacter literals in chapter 2 lexical
conventions.

http://anubis.dkuug.dk/jtc1/sc22/open/n2356/

/Per W

On Wed, 5 Mar 2003, Per Westermark wrote:

> The next step of from the 32-bit case statement below would be to use a
> hash table.
>
> However, how would you replace the switch statement with std::bitset?
>
> /Per W
>
> On Wed, 5 Mar 2003, Ioannis Vranos wrote:
>
> > -------Original Message-------
> >
> > From: Per Westermark
> > Date: =D4=E5=F4=DC=F1=F4=E7, 5 =CC=DC=F1=F4=E9=EF=F2 2003 12:26:51 =F0=
=EC
> > To: Giligun
> > Cc: C++
> > Subject: Re: [Dev-C++] Character variables
> >
> > short s =3D 'ab';
> > int i =3D 'abcd';
> >
> > given that int is 4 byte.
> >
> >
> > =3D=3D> That isn't valid C++. And where it gets compiled you can't cons=
ider it
> > as safe.
> >
> >
> >
> > But a lot of compilers will give you warnings, since it you can't be su=
re
> > if memcpy(buf,&s,sizeof(s)) will give you
> > buf[0] =3D 'a', buf[1] =3D 'b';
> > or
> > buf[0] =3D 'b', buf[1] =3D 'a';
> >
> > In short - be very careful about using this feature. One place where it=
's
> > elegant to use is if you are reading a tagged file, where each tag is
> > 4-byte long:
> > char *buf;
> >
> > int tag =3D 0;
> > for (i =3D 0; i < 4; i++) {
> > tag =3D (tag << 8) | *buf++;
> > }
> >
> >
> > =3D=3D> Too system dependent. Why don't you use wchar_t instead? But si=
nce he
> > wants to store characters (assuming in the range 0-127) he can use a ch=
ar
> > sequence nicely and easily.
> >
> > switch (tag) {
> > case 'STRT': ...; break;
> > case 'HEDR': ...; break;
> > case 'DATA': ...; break;
> > case 'ENDF': ...; break;
> > }
> >
> > If there are a lot of tags, the result is a very fast matching of the
> > tags.
> >
> >
> > =3D=3D> By the way i would do something like the above using std::bitse=
t.
> >
> >
> >
> > Ioannis Vranos
> >
> > * Programming pages: http://www.noicys.freeurl.com
> > * Alternative URL: http://run.to/noicys
>
>
>
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