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Added <, >, <= and >= operators to Set #59

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Added <, >, <= and >= operators to Set #59

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Added <, >, <= and >= operators as alternative to the subset? and sup… 
…erset? method family
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@aef
aef committed Nov 17, 2011
commit a775f9711e2666b9f28b5087a20fd6ab4cbf6f6f
13 changes: 13 additions & 0 deletions lib/set.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,15 @@
# Enumerable objects besides sets and arrays. An Enumerable object
# can be converted to Set using the +to_set+ method.
#
# == Comparison
#
# Although <, >, <= and >= are implemented as alternative for the
# superset? and subset? method family neither the Comparable mixin
# nor <=> is implemented by intention, because a comparison with a
# completely disjunct other set would result in an undefined
# result, which then would cause exceptions when sorting an array of
# sets for example.
#
# == Example
#
# require 'set'
Expand Down Expand Up @@ -192,27 +201,31 @@ def superset?(set)
return false if size < set.size
set.all? { |o| include?(o) }
end
alias >= superset?

# Returns true if the set is a proper superset of the given set.
def proper_superset?(set)
set.is_a?(Set) or raise ArgumentError, "value must be a set"
return false if size <= set.size
set.all? { |o| include?(o) }
end
alias > proper_superset?

# Returns true if the set is a subset of the given set.
def subset?(set)
set.is_a?(Set) or raise ArgumentError, "value must be a set"
return false if set.size < size
all? { |o| set.include?(o) }
end
alias <= subset?

# Returns true if the set is a proper subset of the given set.
def proper_subset?(set)
set.is_a?(Set) or raise ArgumentError, "value must be a set"
return false if set.size <= size
all? { |o| set.include?(o) }
end
alias < proper_subset?

# Calls the given block once for each element in the set, passing
# the element as parameter. Returns an enumerator if no block is
Expand Down