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10416681
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2012-05-02T15:18:47.333
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2012-05-02T15:25:19.887
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2012-05-02T15:25:19.887
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I'd like to add something about their keyword-like behavior, because the answers have been more about where than how; the answer lies in the complex metaprogramming capabilities of Ruby. It is possible to use them as keywords making use of the <code>method_added</code> hook; an hook in Ruby is a function that is called when a specific event (i.e. the hook's name) occurs. What's important is that the <code>method_added</code> hook receives as his argument the name of the method that has been defined: this way, it's possible to modify it's behavior. For example, you could use this hook to define a behavior similar to Python's decorators; the important part is that, differently from the <code>private</code> and <code>protected</code> methods, this decorator-like method should define a <code>method_added</code> that undefines itself: <pre><code>class Module def simple_decorator eigenclass = class << self; self; end eigenclass.class_eval do define_method :method_added do |name| eigenclass.class_eval { remove_method :method_added } old_name = 'old_' + name.to_s alias_method old_name, name class_eval %Q{ def #{name}(*args, &block) p 'Do something before call...' #{old_name}(*args, &block) p '... and something after call.' end } end end end end class UsefulClass simple_decorator def print_something p "I'm a decorated method :)" end def print_something_else p "I'm not decorated :(" end end a = UsefulClass.new a.print_something a.print_something_else </code></pre> <code>simple_decorator</code> looks like a language keyword and behaves like <code>private</code>; however, because it removes the <code>method_added</code> hook, it only applies to the immediately following method definition.
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1. POWhat actually occurs when stating "private"/"protected" in Ruby?
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1. PTAnswer
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1. USAlberto Moriconi
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1. USAlberto Moriconi
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