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Only open struct class if there is actually already a class

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1 parent a686ad6 commit 162b3625d0f7ab3cba2163544bf0a2d1256d3000 @bovi bovi committed Jun 21, 2012
Showing with 41 additions and 37 deletions.
  1. +41 −37 mrblib/struct.rb
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78 mrblib/struct.rb
@@ -2,45 +2,49 @@
# Struct
#
# ISO 15.2.18
-class Struct
- ##
- # Calls the given block for each element of +self+
- # and pass the respective element.
- #
- # ISO 15.2.18.4.4
- def each(&block)
- self.class.members.each{|field|
- block.call(self[field])
- }
- self
- end
+if Object.const_defined?(:Struct)
+ class Struct
- ##
- # Calls the given block for each element of +self+
- # and pass the name and value of the respectiev
- # element.
- #
- # ISO 15.2.18.4.5
- def each_pair(&block)
- self.class.members.each{|field|
- block.call(field.to_sym, self[field])
- }
- self
- end
+ ##
+ # Calls the given block for each element of +self+
+ # and pass the respective element.
+ #
+ # ISO 15.2.18.4.4
+ def each(&block)
+ self.class.members.each{|field|
+ block.call(self[field])
+ }
+ self
+ end
- ##
- # Calls the given block for each element of +self+
- # and returns an array with all elements of which
- # block is not false.
- #
- # ISO 15.2.18.4.7
- def select(&block)
- ary = []
- self.class.members.each{|field|
- val = self[field]
- ary.push(val) if block.call(val)
- }
- ary
+ ##
+ # Calls the given block for each element of +self+
+ # and pass the name and value of the respectiev
+ # element.
+ #
+ # ISO 15.2.18.4.5
+ def each_pair(&block)
+ self.class.members.each{|field|
+ block.call(field.to_sym, self[field])
+ }
+ self
+ end
+
+ ##
+ # Calls the given block for each element of +self+
+ # and returns an array with all elements of which
+ # block is not false.
+ #
+ # ISO 15.2.18.4.7
+ def select(&block)
+ ary = []
+ self.class.members.each{|field|
+ val = self[field]
+ ary.push(val) if block.call(val)
+ }
+ ary
+ end
end
end
+

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