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DarkBASIC Professional Discussion / parameters

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Viper
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Posted: 12th Jun 2003 11:50
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I seem to be having strange problems with passing perameters between
functions. even with using global variables and error occurs.
This is basically the format:




Do I just not see anything or am I going it at the wrong way all
together?
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IanM
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Posted: 12th Jun 2003 13:05
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Function arguments are passed by *value*. ie, they are copies of the original value. So, changing their value only changes the local copy.

If you want to change a global, change it directly:

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Shadow Robert
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Posted: 12th Jun 2003 13:06
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erm... you create an integer you don't give it a value you then pass it to another value that does nothing...

what exactly do you expect to happen?

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Rob K
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Posted: 12th Jun 2003 18:00
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You can use pointers though.

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MrTAToad
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Posted: 12th Jun 2003 19:35
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But not in functions, or has that been fixed ?

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IanM
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Posted: 12th Jun 2003 22:03
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Yep. I use them all the time:



... and before you say it, yes, I know we've already got these in a plugin - I'm just proving the point . Interestingly though, these are just as fast as the plugin versions.
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MrTAToad
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Posted: 12th Jun 2003 22:08 Edited at: 12th Jun 2003 22:09
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Really - I would have expected the C code to be slightly quicker (due to the need for less type checking etc).

Must admit, I haven't done any speed checking at all - I was going on knowledge of previous BASIC's & other languages.

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IanM
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Posted: 12th Jun 2003 22:57
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DBPro does its type checking at compile time, like C does, so there is no performance hit there.

The whole function in either language (excluding the stack stuff) just boils down to something like this:



... except that I think DBPro uses the 'bl' register instead. There's not much room there for a C optimiser to speed things up
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MrTAToad
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Posted: 13th Jun 2003 12:19
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Logical really - should be able to get pretty near C speeds then.

Good news everyone! I really am THAT good...
http://www.nickk.nildram.co.uk/ for great plug-ins - oh my, yes!
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