class Integer def abs Primitive.attr! 'inline' Primitive.cexpr! 'rb_int_abs(self)' end # call-seq: # int.bit_length -> integer # # Returns the number of bits of the value of +int+. # # "Number of bits" means the bit position of the highest bit # which is different from the sign bit # (where the least significant bit has bit position 1). # If there is no such bit (zero or minus one), zero is returned. # # I.e. this method returns ceil(log2(int < 0 ? -int : int+1)). # # (-2**1000-1).bit_length #=> 1001 # (-2**1000).bit_length #=> 1000 # (-2**1000+1).bit_length #=> 1000 # (-2**12-1).bit_length #=> 13 # (-2**12).bit_length #=> 12 # (-2**12+1).bit_length #=> 12 # -0x101.bit_length #=> 9 # -0x100.bit_length #=> 8 # -0xff.bit_length #=> 8 # -2.bit_length #=> 1 # -1.bit_length #=> 0 # 0.bit_length #=> 0 # 1.bit_length #=> 1 # 0xff.bit_length #=> 8 # 0x100.bit_length #=> 9 # (2**12-1).bit_length #=> 12 # (2**12).bit_length #=> 13 # (2**12+1).bit_length #=> 13 # (2**1000-1).bit_length #=> 1000 # (2**1000).bit_length #=> 1001 # (2**1000+1).bit_length #=> 1001 # # This method can be used to detect overflow in Array#pack as follows: # # if n.bit_length < 32 # [n].pack("l") # no overflow # else # raise "overflow" # end def bit_length Primitive.attr! 'inline' Primitive.cexpr! 'rb_int_bit_length(self)' end # call-seq: # int.even? -> true or false # # Returns +true+ if +int+ is an even number. def even? Primitive.attr! 'inline' Primitive.cexpr! 'rb_int_even_p(self)' end # call-seq: # int.integer? -> true # # Since +int+ is already an Integer, this always returns +true+. def integer? return true end def magnitude Primitive.attr! 'inline' Primitive.cexpr! 'rb_int_abs(self)' end # call-seq: # int.odd? -> true or false # # Returns +true+ if +int+ is an odd number. def odd? Primitive.attr! 'inline' Primitive.cexpr! 'rb_int_odd_p(self)' end # call-seq: # int.ord -> self # # Returns the +int+ itself. # # 97.ord #=> 97 # # This method is intended for compatibility to character literals # in Ruby 1.9. # # For example, ?a.ord returns 97 both in 1.8 and 1.9. def ord return self end # call-seq: # int.to_i -> integer # # Since +int+ is already an Integer, returns +self+. # # #to_int is an alias for #to_i. def to_i return self end # call-seq: # int.to_int -> integer # # Since +int+ is already an Integer, returns +self+. def to_int return self end # call-seq: # int.zero? -> true or false # # Returns +true+ if +int+ has a zero value. def zero? Primitive.attr! 'inline' Primitive.cexpr! 'rb_int_zero_p(self)' end end