Fun with numbers - dammit, but I want a cast!
Erik Max Francis
max at alcyone.com
Mon Aug 11 20:15:30 CEST 2003
Terry Reedy wrote:
> No, quite different. A C cast (at least usually) recasts a block of
> bits in a new role without changing the bits. Type constructors
> (unless redundant as in int(1)) return a different object with a
> different set of bits.
Well, the issue is that, in C, a cast can mean a lot of different
things. That's why, in C++, casts are separated into template like
syntaxes depending on their purpose. The unsafe form of C cast is a
reinterpret_cast in C++, and sometimes a const_cast (if you actually
cast away constness of a truly const object and then attempt to mutate
it). The other two -- static_cast and dynamic_cast -- are "safe" in the
sense of being well-defined when the compiler accepts them, and merely
invoke a well-defined conversion and do a runtime type cast,
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