stack.sa


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------------------------->  GNU Sather - sourcefile  <-------------------------
-- Copyright (C) 2000 by K Hopper, University of Waikato, New Zealand        --
-- This file is part of the GNU Sather library. It is free software; you may --
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abstract class $STACK{ETP} < $REENTRANT, $ELT{ETP}, $COPY

abstract class $STACK{ETP} < $REENTRANT, $ELT{ETP}, $COPY is -- This abstract class specifies an abstract stack -- Version 1.3 Dec 2000. Copyright K Hopper, U of Waikato -- Development History -- ------------------- -- Date Who By Detail -- ---- ------ ------ -- 9 Apr 96 bg Original -- 16 Jul 96 hk Modified for Sather 1.1 -- 4 Apr 97 kh Changed for INT to CARD -- 5 Dec 00 kh Simplfied inheritance is_empty : BOOL ; -- This routine returns true if and only if there are no elements on -- the stack. push( elem : ETP ) ; -- This routine pushes the given element on the top of the stack. pop : ETP ; -- This routine removes the element from the top of the stack and -- returns it. top : ETP ; -- This routine returns the value at the top of the stack without -- removing it. end ; -- $STACK{ETP}