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Home/ Questions/Q 166433
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Asked: May 11, 20262026-05-11T12:05:49+00:00 2026-05-11T12:05:49+00:00

Is there a simple way to convert a bitmask in to an array index?

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Is there a simple way to convert a bitmask in to an array index?

ie. If i’ve got an enum

a = 0x01, b = 0x02, c = 0x04, d = 0x08, e = 0x10,  etc 

and I want to store releated data in an array, is there a simple way such that i can convert a to 0, b to 1, c to 2. etc?

Many thanks

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  1. 2026-05-11T12:05:50+00:00Added an answer on May 11, 2026 at 12:05 pm
    r =   ln base 2  and programmatically,  unsigned int v=yourEnumValue; unsigned r = 0;  while (v >>= 1)  {    r++; }  r is your answer 
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