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|
class Numeric
##
# call-seq:
# zero? -> true or false
#
# Returns +true+ if +zero+ has a zero value, +false+ otherwise.
#
# Of the Core and Standard Library classes,
# only Rational and Complex use this implementation.
#
def zero?
self == 0
end
##
# call-seq:
# nonzero? -> self or nil
#
# Returns +self+ if +self+ is not a zero value, +nil+ otherwise;
# uses method <tt>zero?</tt> for the evaluation.
#
def nonzero?
if self == 0
nil
else
self
end
end
##
# call-seq:
# positive? -> true or false
#
# Returns +true+ if +self+ is greater than 0, +false+ otherwise.
#
def positive?
self > 0
end
##
# call-seq:
# negative? -> true or false
#
# Returns +true+ if +self+ is less than 0, +false+ otherwise.
#
def negative?
self < 0
end
##
# call-seq:
# num.integer? -> true or false
#
# Returns true if num is an Integer.
#
# 1.0.integer? #=> false
# 1.integer? #=> true
#
def integer?
false
end
end
class Integer
##
# call-seq:
# int.allbits?(mask) -> true or false
#
# Returns +true+ if all bits of <code>+int+ & +mask+</code> are 1.
#
def allbits?(mask)
(self & mask) == mask
end
##
# call-seq:
# int.anybits?(mask) -> true or false
#
# Returns +true+ if any bits of <code>+int+ & +mask+</code> are 1.
#
def anybits?(mask)
(self & mask) != 0
end
##
# call-seq:
# int.nobits?(mask) -> true or false
#
# Returns +true+ if no bits of <code>+int+ & +mask+</code> are 1.
#
def nobits?(mask)
(self & mask) == 0
end
# call-seq:
# ceildiv(other) -> integer
#
# Returns the result of division +self+ by +other+. The
# result is rounded up to the nearest integer.
#
# 3.ceildiv(3) # => 1
# 4.ceildiv(3) # => 2
#
# 4.ceildiv(-3) # => -1
# -4.ceildiv(3) # => -1
# -4.ceildiv(-3) # => 2
#
# 3.ceildiv(1.2) # => 3
def ceildiv(other)
-div(-other)
end
def integer?
true
end
end
|
