Re: dummy question : runtime type testing...
on a related not.
in the (templated) function taking a variant, I use the coerce() method
which does some conversion (byte to int, for example)
the suggested code (while excellent, much thanks again!) is very stringent,
doesn't allow for such implicit conversion
i.e. with
bool isTypeOf(TypeInfo ti1, TypeInfo ti2) { return ( ti1 is ti2 ); }
isTypeOf(typeid(byte), typeid(int)) will return false.
is there (I might be pushing it here, I know :P) a way to make it return
true in such case??
"Mike Wey" wrote in message news:ithv61$2j5t$1...@digitalmars.com...
On 06/18/2011 05:28 AM, Lloyd Dupont wrote:
ho... easy hey!
but how about the other 2 test I'd like be able to run?
bool isTypeOf(T)(TypeInfo ti) { "return T is ti" }
bool isTypeOf(TypeInfo ti1, TypeInfo ti2) { "return ti1 is ti2" }
bool isTypeOf(T)(TypeInfo ti)
{
return ( typeid(T) is ti );
}
bool isTypeOf(TypeInfo ti1, TypeInfo ti2)
{
return ( ti1 is ti2 );
}
--
Mike Wey
Re: dummy question : runtime type testing...
That simple hey?!?
Awesome!
You are a week-end saver! :)
"Mike Wey" wrote in message news:ithv61$2j5t$1...@digitalmars.com...
bool isTypeOf(T)(TypeInfo ti)
{
return ( typeid(T) is ti );
}
bool isTypeOf(TypeInfo ti1, TypeInfo ti2)
{
return ( ti1 is ti2 );
}
--
Mike Wey
Re: dummy question : runtime type testing...
On 06/18/2011 05:28 AM, Lloyd Dupont wrote:
ho... easy hey!
but how about the other 2 test I'd like be able to run?
bool isTypeOf(T)(TypeInfo ti) { "return T is ti" }
bool isTypeOf(TypeInfo ti1, TypeInfo ti2) { "return ti1 is ti2" }
bool isTypeOf(T)(TypeInfo ti)
{
return ( typeid(T) is ti );
}
bool isTypeOf(TypeInfo ti1, TypeInfo ti2)
{
return ( ti1 is ti2 );
}
--
Mike Wey
Re: dummy question : runtime type testing...
On 2011-06-17 20:28, Lloyd Dupont wrote:
> ho... easy hey!
> but how about the other 2 test I'd like be able to run?
>
> bool isTypeOf(T)(TypeInfo ti) { "return T is ti" }
> bool isTypeOf(TypeInfo ti1, TypeInfo ti2) { "return ti1 is ti2" }
I'm afraid that I don't know much about TypeInfo. In my experience, compile-
time reflection is more than enough. So, I've never attempted any kind of
runtime reflection in D, and I've never found any use for TypeInfo. So, I'm
not particular well-informed on what information TypeInfo has in it.
- Jonathan M Davis
Re: dummy question : runtime type testing...
ho... easy hey!
but how about the other 2 test I'd like be able to run?
bool isTypeOf(T)(TypeInfo ti) { "return T is ti" }
bool isTypeOf(TypeInfo ti1, TypeInfo ti2) { "return ti1 is ti2" }
"Jonathan M Davis" wrote in message
news:mailman.988.1308367581.14074.digitalmars-d-le...@puremagic.com...
On 2011-06-17 19:58, Lloyd Dupont wrote:
given
A a =
class A {}
class B : A {}
how could I test, at runtime, if "a" is just a "A" or is a "B"?
Cast it. The result will be null if the cast fails.
if(cast(B)a)
//it's a B
else
//it's an A but not a B
- Jonathan M Davis
Re: dummy question : runtime type testing...
On 2011-06-17 19:58, Lloyd Dupont wrote:
> given
>
> A a =
> class A {}
> class B : A {}
>
> how could I test, at runtime, if "a" is just a "A" or is a "B"?
Cast it. The result will be null if the cast fails.
if(cast(B)a)
//it's a B
else
//it's an A but not a B
- Jonathan M Davis
dummy question : runtime type testing...
given
A a =
class A {}
class B : A {}
how could I test, at runtime, if "a" is just a "A" or is a "B"?
also, give a type T and a TypeInfo variable, how can I know if a variable of
type T is attributable to a variable of type described by TypeInfo?
i.e. how could I implement the method below?
bool isTypeOf(T)(TypeInfo ti) { /* how to check and return whether T is a
ti or a subclass */ }
