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?


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[Alf P. Steinbach]

Re: limiting class template parameters

On Thu, 16 Oct 2003 19:46:27 -0400, Kartsev <member31623@db forums.com> wrote:
[color=blue]
>how to limit class template parameter T in
>template <class T> SomeClass { /*.... */ }
>to integral numeric types?[/color]

#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]

Re: limiting class template parameters


"Kartsev" <member31623@db forums.com> wrote in message
news:3491414.10 66347987@dbforu ms.com...[color=blue]
>
> hello!
>
> how to limit class template parameter T in
>
>
>
> template <class T> SomeClass { /*.... */ }
>
>
>
> to integral numeric types?[/color]

if(!std::numeri c_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