count

Counts no. of true values. 📰 📘

Can be used to implement one-hot / one-cold detector.

count(a, b, ...)
# a: 1st boolean
# b: 2nd boolean

from extra_boolean import count


count(True, True)
# 2

count(True, False)
# 1

count(True, True, True, False)
# 3           ^     ^     ^

count(False, True, False, False)
# 1                  ^

References

• Parallel method: Bit Twiddling Hacks
• bit-twiddle: @mikolalysenko
• count-bits: @DenQ
• popcnt32: @emilbayes