based on Bounded Spec InstanceExec (Mauricio Fernandez) eigenclass.org/hiki/bounded+space+instance_exec
uses singleton_class instead of global InstanceExecHelper module
this keeps it scoped to classes/modules that include this module
only necessary for ruby 1.8.6
# File lib/rspec/matchers/extensions/instance_eval_with_args.rb, line 10 10: def instance_eval_with_args(*args, &block) 11: return instance_exec(*args, &block) if respond_to?(:instance_exec) 12: 13: # If there are no args and the block doesn't expect any, there's no 14: # need to fake instance_exec with our hack below. 15: # Notes: 16: # * lambda { }.arity # => -1 17: # * lambda { || }.arity # => 0 18: # * lambda { |*a| }.arity # -1 19: return instance_eval(&block) if block.arity < 1 && args.empty? 20: 21: singleton_class = (class << self; self; end) 22: begin 23: orig_critical, Thread.critical = Thread.critical, true 24: n = 0 25: n += 1 while respond_to?(method_name="__instance_exec#{n}") 26: singleton_class.module_eval{ define_method(method_name, &block) } 27: ensure 28: Thread.critical = orig_critical 29: end 30: begin 31: return send(method_name, *args) 32: ensure 33: singleton_class.module_eval{ remove_method(method_name) } rescue nil 34: end 35: end
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