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way to get size of an array using something like sizeof?

General and Gameplay Programming Programming

Started by johnnyBravo January 16, 2004 02:08 AM

6 comments, last by johnnyBravo 20 years, 4 months ago

johnnyBravo

100

Author

January 16, 2004 02:08 AM

say ive got an array eg int abc[10]; is there someway i can use a function on it, to determine the size of the array. eg getsize(abc) would equal 10 thanks,

SiCrane

11,840

January 16, 2004 02:11 AM

Did you try sizeof(abc)?

jacksaccountongamedev

552

January 16, 2004 02:12 AM

Why not use sizeof and then divide the result by the size of the array datatype (ie int in the example you provided)?

[edited by - jack_1313 on January 16, 2004 3:14:01 AM]

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johnnyBravo

100

Author

January 16, 2004 02:12 AM

returns 40

SiCrane

11,840

January 16, 2004 02:14 AM

Which is the size of the array in bytes. If you want the number of elements then try sizeof(abc)/sizeof(int).

johnnyBravo

100

Author

January 16, 2004 02:17 AM

cool thanks

Alimonster

185

January 16, 2004 10:23 AM

Watch out though -- if you pass arrays to functions as pointers, this trick won''t work inside the functions (it''ll give you 4 bytes for the array size as it will just be a pointer). It''s best to either keep a note of the array size in a variable and pass it around or to use a genuine container class (e.g. std::vector) which will keep an internal note of the size.