Re: try and catch

Rolf Magnus <>
Sat, 03 Mar 2007 16:56:53 +0100
Alf P. Steinbach wrote:

But if you have that low-level pattern occurring more than one place in
your code, consider abstracting it using the template pattern (nothing
to do with templates), like

Well, it could be combined with templates. I don't really see a need for
runtime polymorphism here.

   const unsigned untilDoomsday = unsigned(-1);

   struct Retry
       bool operator( unsigned maxTries ) const


         bool operator()( unsigned maxTries ) const

           while( maxTries > 0 )
                   return true;
               catch( std::exception const& x )
                   onException( x );
               if( maxTries != untilDoomsday ) { --maxTries; }
           return false;

       virtual void doIt() const = 0;
       virtual void onException( std::exception const& x ) const {}

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