Range checked assignment
mateusz.mitaszka at gmail.com
Tue Sep 8 15:56:36 UTC 2020
On Tuesday, 8 September 2020 at 14:18:14 UTC, Cecil Ward wrote:
> What I would like to do is (in pseudo-code) :
> declare_var my_var : int range 0..7; // i.e. 0 <= val <= 7;
> my_var = 6; // ok
> my_var = 8; // bang ! static assert fail or assert fail at
> my_var = 6;
> my_var += 2; // bang ! value 8 is > 7
> So every assignment is range-checked at either compile-time if
> at all possible or else at runtime. This includes things like
> += and initialisers of course, not just straight assignment.
> I assumed I would have to create a struct type definition and
> handle various operators. How many will I have to handle? I
> would of course make it a template so I can reuse this
> otherwise horribly repetitive code.
I believe you could use Checked
custom hook or roll your own type with appropriate operator
Code for this won't be that bad, thanks to string mixins. Just
mixin("lhs" ~ op ~ "rhs") and Bob's your uncle :).
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