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The Meaning of test_bit?


Deji
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As far as I know, the bit functions in SA simply set 1 of 32 bits for reading at a later state... Like variables, but restricted to 1 and 0.

 

Why?

 

Why did Rockstar make these and not just use variables? Was it for a case where 32 vars wasn't enough and they needed more only to set a true/false var... And as far as I know, they act like Global Variables, so any thread can read them, but these only carry 1 byte, not 4. Is it simply to save a bit of game memory?

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Why did Rockstar make these and not just use variables? Was it for a case where 32 vars wasn't enough and they needed more only to set a true/false var... And as far as I know, they act like Global Variables, so any thread can read them, but these only carry 1 byte, not 4. Is it simply to save a bit of game memory?

They only contain 1/8th byte. Also, most real-world applications use bitmasks, it's only sad to see how most people doing SA scripting don't have any idea about real software development. It's just a waste of memory to use 4 bytes for a single flag (which would be max 128 bytes for 32 flags) when you can have 32 of them in only 4 bytes.

 

In a single case it might not matter too much, but when you're making a huge table of thousands of entries you will notice the huge space differences soon enough. wink.gif Also, no, they're not just global variables, you can also use a script-local variable for them.

 

PS: Oddly, I was just thinking about the use of bitmasks and 'oh well, those SA scripters would just think "well, we just use a separate var"' an hour ago tounge.gif

SsZgxdL.png

Inactive in GTA/R* title modification indefinitely pursuant to a court order obtained by TTWO. Good job acting against modding!

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