• Mf_Gh (15/15) Nov 22 2013 hi, i started to play a round with D and try to do something like:
• Jonathan M Davis (19/39) Nov 22 2013 Because there's no virtual function involved. There's nothing virtal abo...
• Mf_Gh (1/1) Nov 22 2013 thx

"Mf_Gh" <Mf_Gh trash-mail.com> writes:

hi, i started to play a round with D and try to do something like:

class A{
	string a = "alias A";
	alias a this;
}

class B:A{
	string b = "alias B";
	alias b this;
}


void main() {
	A b = new B();
	writeln(b); //outputs alias A
}

i thought the output would be "alias B". why isn't the alias 
taken from the runtimetype?

Jonathan M Davis <jmdavisProg gmx.com> writes:

On Friday, November 22, 2013 11:21:35 Mf_Gh wrote:
 hi, i started to play a round with D and try to do something like:
 
 class A{
 	string a = "alias A";
 	alias a this;
 }
 
 class B:A{
 	string b = "alias B";
 	alias b this;
 }
 
 
 void main() {
 	A b = new B();
 	writeln(b); //outputs alias A
 }
 
 i thought the output would be "alias B". why isn't the alias
 taken from the runtimetype?

Because there's no virtual function involved. There's nothing virtal about 
either a or b. They're just variables. You'd need to alias to a virtual 
function if you wanted polymorphic behavior. e.g. something like

class A{
        string a = "alias A";
        string get() { return a; }
        alias get this;
}

class B:A{
        string b = "alias B";
        override string get() { return b; }
        alias get this;
}


void main() {
        A b = new B();
        writeln(b); //outputs alias A
}


- Jonathan M Davis

"Mf_Gh" <Mf_Gh trash-mail.com> writes:

thx