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m_stack.pas
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m_stack.pas
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//------------------------------------------------------------------------------
//
// FPCDoom - Port of Doom to Free Pascal Compiler
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 2004-2007 by Jim Valavanis
// Copyright (C) 2017-2022 by Jim Valavanis
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
//------------------------------------------------------------------------------
// E-Mail: jimmyvalavanis@yahoo.gr
// Site : https://sourceforge.net/projects/fpcdoom/
//------------------------------------------------------------------------------
{$I FPCDoom.inc}
unit m_stack;
interface
uses
d_fpc;
type
TIntegerStack = class(TDNumberList)
public
procedure Push(const x: integer);
function Pop(var x: integer): boolean;
end;
implementation
//==============================================================================
//
// TIntegerStack.Push
//
//==============================================================================
procedure TIntegerStack.Push(const x: integer);
begin
Add(x);
end;
//==============================================================================
//
// TIntegerStack.Pop
//
//==============================================================================
function TIntegerStack.Pop(var x: integer): boolean;
begin
result := Count > 0;
if result then
begin
x := Numbers[Count - 1];
Delete(Count - 1);
end;
end;
end.