FW: Special functions in TR1

[Stephen M. Webb]

On 01/12/05 13:10, Smith-Rowland, Edward M (Contractor) wrote:
>
> Here's a schematic:
>
> template< typename Numeric >
> Numeric __func( Numeric x )
> {
>   if ( ! std::tr1::is_floating_point< Numeric >::value )
>     {
>       throw std::domain_error;
>     }
>
>   if ( sizeof( Numeric ) == sizeof( double )
>     {
>       //  Initialize for double algorithm.
>     }
>
>   ...
> }

I would suggest that a compile-time error be produced instead of a runtime 
error for invalid template parameters.  Something like the following.

 typedef typename __enable_if<result_type,
                              is_floating_point<result_type>::value
			     >::__type is_valid_type;

Just, you know, in case you're serious about implementing these.

--
Stephen M. Webb
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