p.location-badge.
  exported from <a href='../forms'>angular2/forms</a>
  defined in <a href="https://github.com/angular/angular/tree/3a0410a/modules/angular2/src/forms/directives/checkbox_value_accessor.ts#L4-L51">angular2/src/forms/directives/checkbox_value_accessor.ts (line 4)</a>

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  The accessor for writing a value and listening to changes on a checkbox input element.
  
   # Example
   ```
   <input type="checkbox" [ng-control]="rememberLogin">
   ```
  
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    h3 registerOnTouched

    
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        registerOnTouched(fn)
    
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