Classes new'd inside for loop are all the same instance?
drug via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Thu Sep 8 05:36:29 PDT 2016
08.09.2016 15:24, lobo пишет:
> I am confused, which is normal, but I'd appreciate some help :-)
>
> If I create N classes in a for loop they are all the same instance. I
> would expect each to be a unique instance of the class. See the code below
>
> ---
>
> class C {}
> void main() {
> import std.stdio;
>
> auto c1 = new C();
> writefln("c1:%s", &c1); // OK, instance c1 is unique
>
> auto c2 = new C(); // OK, instance c2 is unqiue
> writefln("c2:%s", &c2);
>
> foreach(a; 0..10) {
>
> C c = new C(); // All instances are the same object with the
> same address?
> writefln("c:%s", &c);
>
> }
> }
> ---
>
> This isn't what I expected. What could I be doing wrong?
>
> Thanks,
> lobo
>
>
&c is address of the variable c, that is allocated on the stack and has
the same address on every iteration
cast(void*)c return the value of variable c that is address of a class
instance and is different for every iteration
in other words
&c is address of pointer
cast(void*)c is the pointer itself
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