• John C (25/25) Jan 24 2006 In the spec on mixins (http://www.digitalmars.com/d/mixin.html) it state...
• Thomas Kuehne (13/38) Jan 25 2006 -----BEGIN PGP SIGNED MESSAGE-----

"John C" <johnch_atms hotmail.com> writes:

In the spec on mixins (http://www.digitalmars.com/d/mixin.html) it states 
"Mixins can add virtual functions to a class". The following shows this to 
be true:

    template Virtuals {
        void test() { printf("Virtuals.test");
    }

    class Target {
        mixin Virtuals;
        void test() { printf("Target.test");
    }

    Target t = new Target;
    t.test(); // prints "Target.test"

However, it the virtual mechanism breaks down when using interfaces:

    interface ITarget {
        void test();
    }

    class Target : ITarget {
        mixin Virtuals;
        void test() { printf("Target.test");
    }

    ITarget t = new Target;
    t.test(); // prints "Virtuals.test"

I would expect the above line to print "Target.test" as in the first 
examples.

John. 

Thomas Kuehne <thomas-dloop kuehne.cn> writes:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

John C schrieb am 2006-01-24:
 In the spec on mixins (http://www.digitalmars.com/d/mixin.html) it states 
 "Mixins can add virtual functions to a class". The following shows this to 
 be true:

     template Virtuals {
         void test() { printf("Virtuals.test");
     }

     class Target {
         mixin Virtuals;
         void test() { printf("Target.test");
     }

     Target t = new Target;
     t.test(); // prints "Target.test"

 However, it the virtual mechanism breaks down when using interfaces:

     interface ITarget {
         void test();
     }

     class Target : ITarget {
         mixin Virtuals;
         void test() { printf("Target.test");
     }

     ITarget t = new Target;
     t.test(); // prints "Virtuals.test"

 I would expect the above line to print "Target.test" as in the first 
 examples.

 John. 

Added to DStress as
http://dstress.kuehne.cn/run/m/mixin_15_A.d
http://dstress.kuehne.cn/run/m/mixin_15_B.d
http://dstress.kuehne.cn/run/m/mixin_15_C.d

Thomas



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