Extending MdSnackBar service

cc_snack_bar.service.ts

import { Injectable } from '@angular/core';
import { MdSnackBar, MdSnackBarRef, MdSnackBarContainer, Overlay, LiveAnnouncer, ComponentPortal, ComponentRef, OverlayRef, OverlayState } from '@angular/material';
import { SnackbarContainerComponent } from './snackbar-container/snackbar-container.component';
import { SnackbarComponent} from './snackbar/snackbar.component';

@Injectable()
export class CcSnackBarService extends MdSnackBar {

  constructor(
        private _overlay : Overlay,
        private liveAnnouncer : LiveAnnouncer,
        private mdSnackBar : MdSnackBar) {
          
        super(_overlay, liveAnnouncer, mdSnackBar)
  }
}