I have this in a class:

enum ActorType:ubyte
{Unit=0, Building=1, Other=2
}

then,
class Actor
{
this()
{
assert(this.getType()<5); //THIS FAILS
}
(...)
public final ActorType type=ActorType.Other;
protected ubyte getType()
{
return cast(ubyte)type;
}

}

In a static constructor, an Actor is created to test another class, and the program ends in an assert error.

orgoton Wrote:

> I have this in a class:
> 
> enum ActorType:ubyte
> {Unit=0, Building=1, Other=2
> }
> 
> then,
> class Actor
> {
> this()
> {
> assert(this.getType()<5); //THIS FAILS
> }
> (...)
> public final ActorType type=ActorType.Other;
> protected ubyte getType()
> {
> return cast(ubyte)type;
> }
> 
> }
> 
> In a static constructor, an Actor is created to test another class, and the program ends in an assert error.

In Java, one declare constants with final. In D we use the const keyword. Note that this has nothing to do with C++ const type qualifier. There is a certainly a bunch of code in your program that assign a new value to your Actor.type variable. Using const, you'll get a compile time error. final is use to explicitly ask the D compiler to make a non polymorphic method (C++ virtual function): by default the D compiler calculate what should be polymorphic or not and optimises in consequences.

I hope this information helps,


import std.stdio ;

class ConsoleOutput
{
    this () {}

    ConsoleOutput opShl (T) ( T something )
    {
        writef ( something );
        return this ;
    }
}

ConsoleOutput cout ;

static this ()
{
    cout = new ConsoleOutput ;
}

enum ActorType : ubyte
{
    Unit = 0,
    Building = 1,
    Other = 2
}

class Actor
{
    this ()
    {
        cout << "constructor " << \n ;
        cout << this.getType () << \n ;

        this.type = cast ( ActorType ) 10 ; // without const Ok, with const: compile time error.
        assert ( this.getType () < 5, "problem" ); //THIS FAILS
    }
    //public final ActorType type = ActorType.Other ;
    public const ActorType type = ActorType.Other ;

    protected ubyte getType()
    {
        cout << "getType ()" \n ;
        return cast(ubyte)type;
    }

}

void main ()
{
    cout << "main" \n ;
    auto actor = new Actor ;
}