Module: Aws::Templates::Utils::Guarded

Included in:
Default::Definition::Calculable, Parametrized
Defined in:
lib/aws/templates/utils/guarded.rb

Overview

Remember Alan Turing’s halting problem and don’t believe in miracles. The method will only work with parameters because they are supposed to be pure unmodifying functions. Hence we can terminate if a parameter method was invoked twice in the stack with the same context.

Defined Under Namespace

Classes: Call

Instance Method Summary collapse

Instance Method Details

#guarded_for(instance, entity) ⇒ Object 



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# File 'lib/aws/templates/utils/guarded.rb', line 14

def guarded_for(instance, entity)
  current_call = Call.new(instance, entity)
  return unless trace.add?(current_call)
  ret = yield
  trace.delete(current_call)
  ret
end