[boost] Re: Avoiding warning on the do{...}while(0) macroimplementation trick

21 Sep 2004

      Ben Hutchings <ben.hutchings <at> businesswebsoftware.com> writes:
...
...
I think I have found a better 'always-false' condition which
does not trigger a warning, and works at least in VC7.1:
    do{ }while(__LINE__==-1)
Do you see a problem with this approach?
<snip>
It works in VC++ 7.1 if you enable "edit and continue", because
this results in non-standard expansion of the __LINE__ macro to
an expression that isn't a compile-time constant.
In general it doesn't work.
Why not something like:

class aa {
public:
    operator bool() const {
        return false;
    }
};

do {} while(aa());

Optimizing this shouldn't be a problem for most compilers...

[boost] Re: Avoiding warning on the do{...}while(0) macroimplementation trick

Goran Mitrovic