Checking runtime object type

[Justin Whear]

On Wed, 08 Feb 2012 11:20:39 -0800, H. S. Teoh wrote:

> What's the correct syntax for checking the runtime type of a derived
> object given its base class pointer? I tried:
> 
> 	Base f() { return new Derived(); }
> 	Base b = f();
> 	assert(is(typeof(b)==Derived));
> 
> but it throws an error. Apparently typeof(b)==Base; so typeof returns
> only compile-time information? How do I get at the runtime type?
> 
> 
> T

Yeah, is() and typeof() are purely compile-time. You'll want the typeid 
expression (http://d-programming-language.org/
expression.html#typeidexpression) which returns an instance of TypeInfo 
(http://d-programming-language.org/phobos/object.html#TypeInfo).