code: function (member, memberValue, visibility) {
          if (undefined === visibility) {
              visibility = _GPF_VISIBILITY_PUBLIC;
          } else {
              visibility = _gpfVisibilityKeywords.indexOf(visibility);
              if (-1 === visibility) {
                  gpf.Error.classInvalidVisibility();
              }
          }
          this._addMember(member, memberValue, visibility);
      }
docs: Adds a member to the class definition.
  
  @param {String} member
  @param {*} memberValue
  @param {String|number} [visibility=_GPF_VISIBILITY_PUBLIC] visibility