Can someone explain how mixin is implemented?

[Jesse Phillips]

Matthew Ong Wrote:

> Perhaps I am missing something here. How can class level definition be 
> part of the mixin?
> 
> Does mixin generate the same binary code as #define as inline code,which 
> meant that same binary is repeated everywhere that macro is used?
> 
> Or does it make a linked to the in a centralized locations that allow 
> binary sharing when it is the same typed T??

I can see what you're trying for and it looks like you'll need string mixins to make it happen.

Mixing is similar to #define in that it does string substitution, but it is unlike #define in that valid D is required declaration and call. You'll have to modify this with string  mixins (I'm surprised it compiles excluding the non-existence of ClassB):

mixin template AType(alias T, U, alias V){class T : ClassC {
private:
    U value;
public:
    this(){}
    void print(){}
        mixin V;
}
}

class ClassC {}

mixin template btype() {
    void someFunction() {};
}

mixin AType!("ClassB", string, btype);

void main() {
    ClassC r = new ClassB();
}