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bin/gems/concurrent-ruby-1.3.5/lib/concurrent-ruby/concurrent/immutable_struct.rb

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+require 'concurrent/synchronization/abstract_struct'
+require 'concurrent/synchronization/lockable_object'
+
+module Concurrent
+
+  # A thread-safe, immutable variation of Ruby's standard `Struct`.
+  #
+  # @see http://ruby-doc.org/core/Struct.html Ruby standard library `Struct`
+  module ImmutableStruct
+    include Synchronization::AbstractStruct
+
+    def self.included(base)
+      base.safe_initialization!
+    end
+
+    # @!macro struct_values
+    def values
+      ns_values
+    end
+
+    alias_method :to_a, :values
+
+    # @!macro struct_values_at
+    def values_at(*indexes)
+      ns_values_at(indexes)
+    end
+
+    # @!macro struct_inspect
+    def inspect
+      ns_inspect
+    end
+
+    alias_method :to_s, :inspect
+
+    # @!macro struct_merge
+    def merge(other, &block)
+      ns_merge(other, &block)
+    end
+
+    # @!macro struct_to_h
+    def to_h
+      ns_to_h
+    end
+
+    # @!macro struct_get
+    def [](member)
+      ns_get(member)
+    end
+
+    # @!macro struct_equality
+    def ==(other)
+      ns_equality(other)
+    end
+
+    # @!macro struct_each
+    def each(&block)
+      return enum_for(:each) unless block_given?
+      ns_each(&block)
+    end
+
+    # @!macro struct_each_pair
+    def each_pair(&block)
+      return enum_for(:each_pair) unless block_given?
+      ns_each_pair(&block)
+    end
+
+    # @!macro struct_select
+    def select(&block)
+      return enum_for(:select) unless block_given?
+      ns_select(&block)
+    end
+
+    private
+
+    # @!visibility private
+    def initialize_copy(original)
+      super(original)
+      ns_initialize_copy
+    end
+
+    # @!macro struct_new
+    def self.new(*args, &block)
+      clazz_name = nil
+      if args.length == 0
+        raise ArgumentError.new('wrong number of arguments (0 for 1+)')
+      elsif args.length > 0 && args.first.is_a?(String)
+        clazz_name = args.shift
+      end
+      FACTORY.define_struct(clazz_name, args, &block)
+    end
+
+    FACTORY = Class.new(Synchronization::LockableObject) do
+      def define_struct(name, members, &block)
+        synchronize do
+          Synchronization::AbstractStruct.define_struct_class(ImmutableStruct, Synchronization::Object, name, members, &block)
+        end
+      end
+    end.new
+    private_constant :FACTORY
+  end
+end