limiting class template parameters

[Kartsev]

hello!

how to limit class template parameter T in



template <class T> SomeClass { /*.... */ }



to integral numeric types?



thanx a lot

hello!

how to limit class template parameter T in



template <class T> SomeClass { /*.... */ }



to integral numeric types?

 

[Alf P. Steinbach]

how to limit class template parameter T in
template <class T> SomeClass { /*.... */ }
to integral numeric types?

#define STATIC_ASSERT( expr ) ... // Your favorite STATIC_ASSERT.

template< typename T >
struct IsIntegralType
{
enum{ yes = (static_cast<T>(1)/2 == 0) };
};

template< typename T >
class SomeClass
{
private:
STATIC_ASSERT( IsIntegralType<T>::yes );
public:
...
};

 

[Mike Wahler]

hello!

how to limit class template parameter T in



template <class T> SomeClass { /*.... */ }



to integral numeric types?

if(!std::numeric_limits<T>::is_integer)
throw("no no!");

I'm not sure if this restriction can be
imposed at compile time (I can't think
of a way right now.)


-Mike