Re: 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;
}