[Boost-users] [Numeric Conversion] numeric_cast and UDTs

From: Scott Meyers (usenet_at_[hidden])
Date: 2006-03-07 00:18:16

 From a cursory look through the library doc, it appears that it's possible to 
create a UDT such that numeric_cast will work with it.  For example,

   class int24 { ... };     // for 24-bit ints;  must also specialize
                            // std::numeric_limits, create a range
                            // checking policy, etc.

   int i;
   ...
   int24 myInt = numeric_cast<int24>(i);    // throws if i's value won't
                                            // fit in an int24

   short s = numeric_cast<short>(myInt);    // throws if myInt's value won't
                                            // fit in a short

Can somebody who knows this library please tell me if my understanding is 
correct -- that numeric_cast can be made to work with integral UDTs?

Thanks,

Scott