disabling unary "-" for unsigned types

[Michel Fortin]

On 2010-02-15 17:21:09 -0500, Walter Bright <newshound1 at digitalmars.com> said:

> Or:
> 
>     -cast(int)x
> 
> That blows when x happens to be a ulong. Whoops. It blows even worse if 
> x turns out to be a struct with overloaded opNeg and opCast, suddenly 
> the opCast gets selected. Oops.

That one is easy to fix. Add a "signed(x)" template function returning 
the signed counterpart of x. You could even insert a runtime range 
check if you really wanted to.


-- 
Michel Fortin
michel.fortin at michelf.com
http://michelf.com/