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Diffstat (limited to 'gcc/ada/g-bubsor.ads')
| -rw-r--r-- | gcc/ada/g-bubsor.ads | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/gcc/ada/g-bubsor.ads b/gcc/ada/g-bubsor.ads new file mode 100644 index 00000000000..2294e009286 --- /dev/null +++ b/gcc/ada/g-bubsor.ads @@ -0,0 +1,68 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUNTIME COMPONENTS -- +-- -- +-- G N A T . B U B B L E _ S O R T -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1995-2002 Ada Core Technologies, Inc. -- +-- -- +-- GNAT is free software; you can redistribute it and/or modify it under -- +-- terms of the GNU General Public License as published by the Free Soft- -- +-- ware Foundation; either version 2, or (at your option) any later ver- -- +-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- +-- OUT 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 distributed with GNAT; see file COPYING. If not, write -- +-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- +-- MA 02111-1307, USA. -- +-- -- +-- As a special exception, if other files instantiate generics from this -- +-- unit, or you link this unit with other files to produce an executable, -- +-- this unit does not by itself cause the resulting executable to be -- +-- covered by the GNU General Public License. This exception does not -- +-- however invalidate any other reasons why the executable file might be -- +-- covered by the GNU Public License. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- Sort Utility (Using Bubblesort Algorithm) + +-- This package provides a bubblesort routine that works with access to +-- subprogram parameters, so that it can be used with different types with +-- shared sorting code. + +-- See also GNAT.Bubble_Sort_G and GNAT.Bubble_Sort_A. These are older +-- versions of this routine. In some cases GNAT.Bubble_Sort_G may be a +-- little faster than GNAT.Bubble_Sort, at the expense of generic code +-- duplication and a less convenient interface. The generic version also +-- has the advantage of being Pure, while this unit can only be Preelaborate. + +package GNAT.Bubble_Sort is +pragma Preelaborate (Bubble_Sort); + + -- The data to be sorted is assumed to be indexed by integer values from + -- 1 to N, where N is the number of items to be sorted. + + type Xchg_Procedure is access procedure (Op1, Op2 : Natural); + -- A pointer to a procedure that exchanges the two data items whose + -- index values are Op1 and Op2. + + type Lt_Function is access function (Op1, Op2 : Natural) return Boolean; + -- A pointer to a function that compares two items and returns True if + -- the item with index value Op1 is less than the item with Index value + -- Op2, and False if the Op1 item is greater than or equal to the Op2 + -- item. + + procedure Sort (N : Natural; Xchg : Xchg_Procedure; Lt : Lt_Function); + -- This procedures sorts items in the range from 1 to N into ascending + -- order making calls to Lt to do required comparisons, and calls to + -- Xchg to exchange items. The sort is stable, that is the order of + -- equal items in the input is preserved. + +end GNAT.Bubble_Sort; |