[boost] Re: boost::any

From: Thorsten Ottosen (nesotto_at_[hidden])
Date: 2004-11-02 08:57:13

"Dirk Gregorius" <dirk_at_[hidden]> wrote in message
news:000601c4c0dd$9f8cb280$0e2a9386_at_Erft...
| Hi,
|
| I have a std::vector<boost::any> m_Processes containing several hydrological
| processes where a process is implemented like this:
|
| template<typename DerivedT>
| class Process
| {
| public:
|   DerivedT& asDerived( void )
|   {
|        return static_cast<DerivedT&>( *this );
|   }
|   void Apply( Subbasin& subbasin )
|   {
|        asDerived().Apply( subbasin );
|   }
| }
|
| Special Processes are derived from Process and pass their type as template
| argument ( Barton and Nackman Trick ).

no, you mean "the curiously recurring template idiom"

|I am writing a simulation software
| for hydrological simulation and want to test if I can get a better
| performance when getting rid of the virtual function overhead since all
| types are know at compile time.

have you measured that virtual functions are slowing the stuff down? Anyway, I
would expect boost.any + static dispatch is slower than
virtual dispatch in a class hierarchy.

br

Thorsten