Hooks

Special macros exist that are invoked in some situations, as hooks: inherited, included and method_missing.

• inherited will be invoked at compile-time when a subclass is defined. @type becomes the inherited type.
• included will be invoked at compile-time when a module is included. @type becomes the including type.
• extended will be invoked at compile-time when a module is extended. @type becomes the extending type.
• method_missing will be invoked at compile-time when a method is not found.

Example of inherited:

class Parent
  macro inherited
    def {{@type.name.downcase.id}}
      1
    end
  end
end

class Child < Parent
end

Child.new.child #=> 1

Example of method_missing:

macro method_missing(name, args, block)
  print "Got ", {{name.id.stringify}}, " with ", {{args.size}}, " arguments", '\n'
end

foo          # Prints: Got foo with 0 arguments
bar 'a', 'b' # Prints: Got bar with 2 arguments