• Enjoys Math (15/15) Feb 03 2016 Consider:
• Rikki Cattermole (9/9) Feb 03 2016 T[] list;
• Gary Willoughby (5/20) Feb 04 2016 if (cast(B)objLis[k])

Enjoys Math <enjoysmath gmail.com> writes:

Consider:

class C {

}

class B : C {

}

class A : B {

}

class D : C {

}

C[] objList;

how do we test if objLis[k] is of base type "B"?

Ie for [new A(), new B(), new D(), new C()] would give output 
[true, true, false, false].

?

Thank you! :D

Rikki Cattermole <alphaglosined gmail.com> writes:

T[] list;

foreach(v; list) {
	if (SpecialT v2 = cast(SpecialT)v) {
		writeln(v2);
	} else {
		writeln("err");
	}
}

That should work.

Gary Willoughby <dev nomad.so> writes:

On Thursday, 4 February 2016 at 05:51:22 UTC, Enjoys Math wrote:
 Consider:

 class C {

 }

 class B : C {

 }

 class A : B {

 }

 class D : C {

 }

 C[] objList;

 how do we test if objLis[k] is of base type "B"?

 Ie for [new A(), new B(), new D(), new C()] would give output 
 [true, true, false, false].

 ?

 Thank you! :D

if (cast(B)objLis[k])
{
     // It's an instance.
}