js/libs/ember-1.5.1.js
function(from, flag) {
    var C = this, binding = new C(null, from);
    return binding.oneWay(flag);
  }
function(from, flag) {
    var C = this, binding = new C(null, from);
    return binding.oneWay(flag);
  }
Creates a new Binding instance and makes it apply in a single direction.
A one-way binding will relay changes on the `from` side object (supplied
as the `from` argument) the `to` side, but not the other way around.
This means that if you change the "to" side directly, the "from" side may have
a different value.

See `Binding.oneWay`.

@method oneWay
@param {String} from from path.
@param {Boolean} [flag] (Optional) passing nothing here will make the
binding `oneWay`. You can instead pass `false` to disable `oneWay`, making the
binding two way again.
@return {Ember.Binding} `this`