Bypassing the const promise
div0
div0 at users.sourceforge.net
Thu Nov 19 12:01:02 PST 2009
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Tomek Sowiñski wrote:
> const on a function forbids changing members:
>
> class Wrong {
> int a;
> void foo() const {
> a = 4;
> }
> }
>
> The above rightly doesn't compile. But with a little twist...
>
> class A {
> int a;
> void foo(ref int i) const {
> i = 4;
> }
> void foo() const {
> foo(a);
> }
> }
>
> void main() {
> auto a = new A;
> a.foo;
> assert(a.a == 4);
> }
>
> ... I bypass the const promise on a function (two of them in fact). No casting, no evil stuff.
>
> Is this a compiler bug or feature?
>
> Tomek
That's definitely a bug.
Casting away const should always be explicit operation.
- --
My enormous talent is exceeded only by my outrageous laziness.
http://www.ssTk.co.uk
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