On 6/25/06, Eric Sumner <[EMAIL PROTECTED]> wrote:
> On 6/25/06, Guido van Rossum <[EMAIL PROTECTED]> wrote:
> > Unfortunately, a mechanism that would let you register a callback for
> > when a particular variable or attribute used in a cached expression is
> > used, is pretty hard to implement wit
On 6/25/06, Guido van Rossum <[EMAIL PROTECTED]> wrote:
> Unfortunately, a mechanism that would let you register a callback for
> when a particular variable or attribute used in a cached expression is
> used, is pretty hard to implement without affecting the performance of
> code that doesn't use i
On 6/25/06, Eric Sumner <[EMAIL PROTECTED]> wrote:
> It seems to me that the main reason to provide constantification (in a
> switch statement or anywhere else) is to be able to optimize execution
> by caching the result locally for later use. The problem comes from
> trying to determine exactly w
On Sun, Jun 25, 2006, Eric Sumner wrote:
>
> In general, a cached value can be used (rather than re-evaluating the
> expression) if:
> - The expression has no side effects,
> - The result of all operations is deterministic, and
> - None of the expression parameters have changed since the cach
