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-# Copyright 2001, 2002 Dave Abrahams
-# Copyright 2003 Vladimir Prus
-# Distributed under the Boost Software License, Version 1.0.
-# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
-
-class set
-{
- rule __init__ ( )
- {
- }
-
- rule add ( elements * )
- {
- for local e in $(elements)
- {
- if ! $($(e))
- {
- $(e) = 1 ;
- self.result += $(e) ;
- }
- }
- }
-
- rule contains ( element )
- {
- return $($(element)) ;
- }
-
- rule list ( )
- {
- return $(self.result) ;
- }
-}
-
-
-
-# Returns the elements of set1 that are not in set2.
-#
-rule difference ( set1 * : set2 * )
-{
- local result = ;
- for local element in $(set1)
- {
- if ! ( $(element) in $(set2) )
- {
- result += $(element) ;
- }
- }
- return $(result) ;
-}
-
-NATIVE_RULE set : difference ;
-
-
-# Removes all the items appearing in both set1 & set2.
-#
-rule intersection ( set1 * : set2 * )
-{
- local result ;
- for local v in $(set1)
- {
- if $(v) in $(set2)
- {
- result += $(v) ;
- }
- }
- return $(result) ;
-}
-
-
-# Returns whether set1 & set2 contain the same elements. Note that this ignores
-# any element ordering differences as well as any element duplication.
-#
-rule equal ( set1 * : set2 * )
-{
- if $(set1) in $(set2) && ( $(set2) in $(set1) )
- {
- return true ;
- }
-}
-
-
-rule __test__ ( )
-{
- import assert ;
-
- assert.result 0 1 4 6 8 9 : difference 0 1 2 3 4 5 6 7 8 9 : 2 3 5 7 ;
- assert.result 2 5 7 : intersection 0 1 2 4 5 6 7 8 9 : 2 3 5 7 ;
-
- assert.true equal : ;
- assert.true equal 1 1 2 3 : 3 2 2 1 ;
- assert.false equal 2 3 : 3 2 2 1 ;
-}