Semantics of ^^, Version 3 (Final?)

Rainer Deyke rainerd at eldwood.com
Wed Dec 9 01:11:50 PST 2009


Don wrote:
> Note that by definining the 0,1, -1 cases as "rewriting" rules rather
> than return values, it should be clearer that they don't apply to
> variables having those values.

I don't care if x^^y with y < 0 is 0, a runtime error, or even undefined
behavior.  However, having different behavior if x is a compile-time
constant than if x is a variable is unacceptable because it silently
changes the (defined) behavior of a function when a runtime parameter is
changed to a template parameter or vice versa, or even when the compiler
becomes a bit more clever about CTFE.


-- 
Rainer Deyke - rainerd at eldwood.com



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