RE: [boost] Re: Math Constants Formal Review - does static_cast merely select?

From: Paul A Bristow (boost_at_[hidden])
Date: 2003-06-18 16:27:27

|  -----Original Message-----
|  From: boost-bounces_at_[hidden] 
|  [mailto:boost-bounces_at_[hidden]] On Behalf Of Gennaro Prota
|  Sent: 18 June 2003 15:45
|  To: boost_at_[hidden]
|  Subject: [boost] Re: Math Constants Formal Review - accuracy 
|  is vital too
|  
 | > the proposed code uses namespaces 
|  >to allow selection of the FP size either individually:
|  
|  In Daniel's solution static_cast<type>(x) simply "selects" 
|  the corresponding specialization of x_value. So
|  
|    static_cast<float>(pi)
|  
|  is fundamentally different from, say,
|  
|    double pi = ...;
|    static_cast<float>(pi)

Perhaps naively, I find this surprising - but I am not a language guru.

Can you/anyone confirm that this is required by the Standard
 - and is in fact what happens when compilers process this?

If it walks like a duck and quacks like a duck ...

Paul