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+--  Generic algorithms
+--  Copyright (C) 2016 Tristan Gingold
+--
+--  GHDL 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, or (at your option) any later
+--  version.
+--
+--  GHDL 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 GHDL; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+
+package Algos is
+   --  Heap sort the N elements.
+   generic
+      --  Compare two elements, return true iff OP1 < OP2.
+      with function Lt (Op1, Op2 : Natural) return Boolean;
+
+      --  Swap two elements.
+      with procedure Swap (From : Natural; To : Natural);
+   procedure Heap_Sort (N : Natural);
+end Algos;