Implementing isInstanceOf(...) in c, any ideas

[dwaach]

Hi,

I am thinking about implementing isInstanceOf() in c.
Any ideas ???

Ex.

int findType(struct x)
{
struct X orgX;
if (isInstanceOf(x, orgX))
return 1;
else
return 0;
}

main()
{
struct Y x;
int val=0;
val=findType(x);
}



Regards,
Abhishek

 

[Protoman]

Hi,

I am thinking about implementing isInstanceOf() in c.
Any ideas ???

Ex.

int findType(struct x)
{
struct X orgX;
if (isInstanceOf(x, orgX))
return 1;
else
return 0;
}

main()
{
struct Y x;
int val=0;
val=findType(x);
}



Regards,
Abhishek

Well, there's always RTTI...

 

[Kufa]

I am thinking about implementing isInstanceOf() in c.

Any ideas ???

Post in comp.lang.c instead of c++ ?

 

[Ivan Vecerina]

: I am thinking about implementing isInstanceOf() in c.
: Any ideas ???
C has no built-in concept of classes or instances,
so the answer would depend on how you choose to emulate
that feature.
In C++, dynamic_cast can be used to find if an object
is of a given subclass. You could write isInstanceOf
as follows:
template<class D, class B>
bool isInstanceOf(const B& b)
{ return !! dynamic_cast<const D*>(&b); }

Usage example (using <fstream>):

bool isFileOutput(std:stream& o)
{
return isInstanceOf<std:fstream>(o);
}