Re: Namespaces and pre-processing directives

["Andrea 'fwyzard' Bocci" <fwyzard-gcc at libero dot it>]

At 15.49 04/04/2003 +0530, Megha Murarka wrote:
> Hi All,
>
> The program given below compiles fine.
> but if we use the statement ,
> int x = MYSPACE::VALUE +1;
>  It gives an error. Why is it so ? (when the #define is present inside the
> scope of the namespace ) ????
> ****************************************************************************
> **
> namespace MYSPACE{
>     #define VALUE 50;
> };
> int main(){
>     int x = VALUE + 1;
>     return 1;
> }
>
> Regards,
> Megha

#define's are handled by the preprocessor, and like macros are unaffected 
by namespaces, classes, etc.
If you try to use them, the compilersees:

> namespace MYSPACE{
> };
> int main(){
>     int x = MYSPACE::50 + 1;
>     return 1;
> }

which has not much sense...

If you need to use namespaces for constants, use enumes instead:

namespace MYSPACE{
    enum {
        VALUE = 50
    };
};
int main(){
    int x = MYSPACE::VALUE + 1;
    return 1;
}

works.

fwyzard