How to new a class object in a struct

[zhang]

Here are some codes:

class AClass
{
    int a = 10;
}

struct AStruct
{
    AClass aclass;

//    this()  // can't do this in a struct
//    {
//        aclass = new AClass()
//    }

    this(AClass aclass_)
    {
        aclass = aclass_;
    }
}


int main(string[] args)
{
    AStruct astruct;
    int a = astruct.aclass.a;
    writefln("%d", a);
    return 0;
}


In D, this() is prohibited in a struct. So
   AStruct astruct
will leave the aclass object to be null. It's not like the way in C++, the 
aclass object will be created automatically.

It always leads some problems when doing porting from C++ to D.

My solution is to use class instead of struct. Then I can create the aclass 
object in this() when I new an AStruct.

Any suggestion? 
Thanks.

----------
Zhang <bitwo...@qq.com>