Why aren't static const floats allowed?

Question

I have a class which is essentially just holds a bunch of constant definitions used through my application. For some reason though, longs compile but floa

Answer 1

The rationale under the standard wording that others have given is the same for which template arguments can't be floating point number. To get consistent result you'll need the compiler implement the same evaluation as the one done at compile time, and that can be complicated for cross-compiler and in the case where the program plays with rounding mode.

From memory, in C++0X, the notion of constant expression has been extended and so your code would be valid (but it is unspecified in the result of floating point constant expressions are the same when evaluated at run-time or at compile time).