Class: MethodDecorators::Precondition

Inherits:

Decorator

• Object
• Decorator
• MethodDecorators::Precondition

Defined in:

lib/method_decorators/precondition.rb

Instance Method Summary

• #call(orig, this, *args, &blk) ⇒ Object
• #initialize(&blk) ⇒ Precondition constructor

  A new instance of Precondition.

Methods inherited from Decorator

#+@, +@, current_decorators

Constructor Details

#initialize(&blk) ⇒ Precondition

# File 'lib/method_decorators/precondition.rb', line 5

def initialize(&blk)
  @block = blk
end

Instance Method Details

#call(orig, this, *args, &blk) ⇒ Object

# File 'lib/method_decorators/precondition.rb', line 9

def call(orig, this, *args, &blk)
  unless passes?(this, *args)
    raise ArgumentError, "failed precondition"
  end
  orig.call(*args, &blk)
end