content: /* 
   * Kodkod -- Copyright (c) 2005-present, Emina Torlak
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  package kodkod.engine.bool;
  
  /** 
   * Visits {@link kodkod.engine.bool.BooleanFormula boolean formulas}.
   * In addition to passing themselves as the argument to the visitor,
   * the boolean values also pass along satelite information of type A.
   *
   * @author Emina Torlak 
   */
  public interface BooleanVisitor<T, A> {
  
  	/**
  	 * Visits the multigate and returns the result.
  	 * @return the result of visiting the given multigate
  	 */
      public T visit(MultiGate multigate, A arg);
      
      /**
       * Visits the if-then-else gate and returns the result.
       * @return the result of visiting the given ITEGate
       */
      public T visit(ITEGate ite, A arg);
      
      /**
  	 * Visits the inverter and returns the result.
  	 * @return the result of visiting the given inverter
  	 */
      public T visit(NotGate negation, A arg);
      
      /**
  	 * Visits the variable and returns the result.
  	 * @return the result of visiting the given variable
  	 */
      public T visit(BooleanVariable variable, A arg);
        
  }
  