why not consfold sin(const)

[Luchezar Belev]

Robert Dewar wrote:

> Luchezar Belev wrote:
> ... 
> Second, surely in any reasonably written program you would expect such
> constants to only be defined once, so I wonder how useful this would
> be in practice.
>...

Here is one example of how this could be useful:
Imagine you have some defined floating point const MY_CONST in your program and you use it in
various floating point expressions in different ways. Say somewhere you use the expression
x+MY_CONST, somewhere else you use the expression log(x)/log(MY_CONST), and somewhere else
exp(2-x*(MY_CONST + sqrt(MY_CONST))) and so on.

Of course you could define different consts for 1/log(MY_CONST) and MY_CONST+sqrt(MY_CONST), but
that's not very beautifuf, especially if you would like to change the value of MY_CONST from time
to time - then you would have to recalculate all of it's derivated consts too.

Lucho



		
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