package de.unisiegen.tpml.core.interpreters ;


import de.unisiegen.tpml.core.ExpressionProofModel ;


/**
 * Base interface for the big and small step interpreter proof models. It
 * extends the {@link de.unisiegen.tpml.core.ExpressionProofModel} interface
 * with functionality to query whether memory operations are enabled during the
 * evaluation of the expression.
 * 
 * @author Benedikt Meurer
 * @version $Rev$
 * @see de.unisiegen.tpml.core.interpreters.InterpreterProofNode
 * @see de.unisiegen.tpml.core.ExpressionProofModel
 */
public interface InterpreterProofModel extends ExpressionProofModel
{
  //
  // Accessors
  //
  /**
   * Returns <code>true</code> if memory operations, as part of the imperative
   * concepts, are used while proving properties of a program. If memory is
   * enabled, the {@link InterpreterProofNode#getStore()} method returns the
   * {@link Store} at the given node. Otherwise an invalid - usually empty -
   * store will be returned.
   * 
   * @return <code>true</code> if memory operations are used while evaluating
   *         the expression.
   * @see Store
   * @see InterpreterProofNode#getStore()
   */
  public boolean isMemoryEnabled ( ) ;
}