'How to fast get an array of the bit positions within a bit array(or bitmap、bit vector)？

How to fast get an array of the bit positions within a bit array(or bitmap、bit vector) ？example: the bitmap or bit array(only have 0 or 1) is [0,0,0,1,1,0,1,0,0], I want to get the bit positions array: [3,4,6].

c++bitmapbitarraybitvector


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