Assignments do an implicit type conversion. In this case, the
conversion is from a string ('now') to a date or timestamp. The string
to date conversion code that handles 'Oct 14, 2009' can also handle 'now".
If you need to assign 'now' to a string, simply cast 'now' to a date,
and the ordinary conversions will generate a canonical date string of
appropriate format and content.
I've been using the hack since 1976, so I'm reasonably sure that it works.
Brian Aker wrote:
Hi!
That will only work until someone asks for a function on a differt
type :)
Flexibility is a win. For instance a user may want to write their own
type.
Cheers,
--Brian
On Oct 14, 2009, at 1:37 PM, Jim Starkey <[email protected]> wrote:
Brian Aker wrote:
Hi!
On Oct 14, 2009, at 1:09 PM, Jim Starkey wrote:
Implementing 'now' as a manifest constant rather (or in addition
to) a pseudo function has much going for it. You can also do
'today', 'tomorrow', 'yesterday', and 'Ann\'s birthday', though the
latter is probably less general.
If you did it as a constant, every time you wanted to add a new
function you would be modifying an enum. Removing a function? Still
sounds bad.
Using a string to match with knowledge that it was a function that
was asked for works. One further step might be to identify the
version of the function that existed during the creation just to be
on the safe side. Or hell... implement COM :)
No, just extend the string to date conversion function. Highly
localized, fast, and completely general.
--
Jim Starkey
Founder, NimbusDB, Inc.
978 526-1376
--
Jim Starkey
Founder, NimbusDB, Inc.
978 526-1376
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