FW: Special functions in TR1

[Ed Smith-Rowland]

| 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.
| 


Right... I was brain dead there for a moment.
The run-time domain_error is for input variables out of range.

The argument types checking would be compile time of course.

--
Stephen M. Webb

**