app.directive('toggle', function(){

  return {

    restrict: 'A',

    template: '<a ng-click="f()">Click Me</a>',

    replace: true,

    scope: {
toggle: '&'

    },

    controller: function($scope) {

      $scope.toggleValue = false;

      $scope.f = function() {

        $scope.toggleValue = !$scope.toggleValue;

        $scope.toggle({message: $scope.toggleValue});

      };

    }

  };

});

You can use like this:

<div toggle="parentToggle(message)"></div>