On Thu, Aug 6, 2009 at 12:04 AM, Hezekiah M.
Carty<[email protected]> wrote:
> Second, the void* approach may not translate well to other languages.
> I'm not sure if there is a way to do this in C that would translate
> well to the other PLplot-supported languages though.
I want to contribute a couple of points:
void* is not really great even for C because of type safety. The
compiler cannot check that when you request a double you don't pass a
pointer to an int.
Even if you go with void* for C, you still aren't tied to any approach
for other languages. For example, for dynamic languages a function
that returns a value (instead of passing a variable by reference)
would better fit into their programming paradigm. You can:
1. Create wrapper functions for each gettable variable.
2. Create a single wrapper function for all gettable values of a
single type. Each function will take an enum member and return a
value of some type.
Structs do map to other languages (unlike void*). But other problems
arise instead. For example, think about Perl. Is it Perl-ish to pass
a reference to a hash and get a single value into it? I don't think
so. This is just an example, but I guess that same reasoning applies
to other languages.
Dmitri Gribenko
--
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <[email protected]>*/
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