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Text File  |  1993-08-08  |  263b  |  15 lines
  1. * Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
  2. * The C++ Answer Book */
  3. * Tony Hansen */
  4. * All rights reserved. */
  5. / Evaluate the expression
  6. nt expr:: eval()
  7.  
  8.    if (!evaluated)
  9. {
  10. value = head->eval();
  11. evaluated++;
  12. }
  13.    return value;
  14.  
  15.