From: akr@... Date: 2017-10-19T06:49:25+00:00 Subject: [ruby-core:83375] [Ruby trunk Feature#12753] Useful operator to check bit-flag is true or false Issue #12753 has been updated by akr (Akira Tanaka). How about Integer#has_allbits?(n), Integer#has_somebits?(n) and Integer#has_nobits?(n) ? ``` class Integer def has_allbits?(n) self & n == n end def has_somebits?(n) self & n != 0 end def has_nobits?(n) self & n == 0 end end ``` ---------------------------------------- Feature #12753: Useful operator to check bit-flag is true or false https://bugs.ruby-lang.org/issues/12753#change-67336 * Author: tagomoris (Satoshi TAGOMORI) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- Ruby's 0 is truthy value. It's useful for many cases, but it's confusing and I made many bugs when I'm writing code to handle binary data, because my thought is almost same with one to write C code in such situation. ```ruby n = get_integer_value if n & 0b10100000 # code for the case when flag is true else # never comes here :( end ``` IMO it's very useful to have methods for such use-cases, like `#and?` and `#xor?` (`#or?` looks not so useful... I can't imagine the use case of this operator, but it's better to have for consistency). ```ruby n = get_integer_value case when n.and?(0b10000000) # negative signed char when n.and?(0b01110000) # large positive else # small positive end ``` -- https://bugs.ruby-lang.org/ Unsubscribe: