Re^3: Most effective way to dynamically load a module?

Define expensive.

eval isn't free, but it doesn't cost that much. In any case this is all micro-optimization that is unlikely to matter much.

Comment on Re^3: Most effective way to dynamically load a module?

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Re^4: Most effective way to dynamically load a module? by BerntB (Deacon) on Aug 22, 2006 at 05:47 UTC
"expensive" here means that I am nervous about this part of the code. :-) I think this bit of code (together with unpacking of objects) are in the critical path. Hmmm... to compile a single statement with one parameter shouldn't be much more than lex:ing a couple of strings and doing a jump in a parser's jump table, then mallocing a bit memory for the minimal parse tree and probably copying the parameter. OK, my instinctive fear of `eval` might be wrong, here. (-: You can take the compiler from the old C programmer but you can never stop him doing premature optimizations? :-)	[reply] [d/l]

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Re^4: Most effective way to dynamically load a module?
by BerntB (Deacon) on Aug 22, 2006 at 05:47 UTC

I think this bit of code (together with unpacking of objects) are in the critical path.

Hmmm... to compile a single statement with one parameter shouldn't be much more than lex:ing a couple of strings and doing a jump in a parser's jump table, then mallocing a bit memory for the minimal parse tree and probably copying the parameter.

OK, my instinctive fear of eval might be wrong, here. (-: You can take the compiler from the old C programmer but you can never stop him doing premature optimizations? :-)

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