Casting Structs

[Timon Gehr via Digitalmars-d-learn]

On 06/01/2014 12:25 AM, Ali Çehreli wrote:
>>
>> dec10 little = cast(dec10(bingo));
>
> You meant cast(dec10)(bingo).
>
>> assert(little == dec10("123.45"));
>>
>> Is this expected behavior?
>>
>> Paul
>>
>
> That is surprising. I've discovered that if the template has members
> that depend on a template parameter than the code fails to compile. I
> think it should fail to compile in other cases as well because a
> separate instantiation of a template is a separate type potentially with
> completely different invariants.

This behaviour is independent of templates. Struct values of the same 
size can be reinterpret-cast to each other this way even if their types 
are completely unrelated.


struct A{
     int a,b;
}
struct B{
     long x;
}

void main(){
     auto a=A();
     auto b=cast(B)a;
}