Checking runtime object type

Johannes Pfau nospam at example.com
Wed Feb 8 11:21:45 PST 2012


Am Wed, 8 Feb 2012 11:20:39 -0800
schrieb "H. S. Teoh" <hsteoh at quickfur.ath.cx>:

> 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
> 

I think using casts is the only way:

Base f() { return new Derived(); }
Base b = f();
auto c = cast(Derived)b;
assert(c !is null);


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