I created a struct, call it "S", and some functions that operate on S. But I'm
confused about when const is useful.
Being an old Java programmer, I use 'const' the same as I used 'final' in Java.
So most of my functions look like this:
S for(const S a, const S b) {
S x = a;
S y = b;
// do some stuff
return a;
}
I declare the parameters const and then copy them to work on them.
I get error messages about not implicitly casting const S to S. So I can make
an explicit cast:
S x = cast(S) a;
S y = cast(S) b;
and the error messages go away.
But I think I must have gone off the rails somewhere -- all I want is for the
caller to be sure the function doesn't alter a and b. But I end up with lots of
casts to/from const. What am I missing??
Paul
