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##############################################################################
##
#W iterator.gd GAP4 package `Utils' Chris Wensley
##
#Y Copyright (C) 2015-2025, The GAP Group
#############################################################################
## These functions complement AllHomomorphisms, AllEndomorphisms, and
## AllAutomorphisms in the main library.
## The code gives an example of an iterator preferrred to a list.
##
#O AllIsomorphismsIterator( <G>, <H> )
#F DoAllIsomorphismsIterator
#O AllIsomorphismsNumber( <G>, <H> )
#O AllIsomorphisms( <G>, <H> )
##
DeclareOperation( "AllIsomorphismsIterator", [ IsGroup, IsGroup ] );
DeclareGlobalName( "DoAllIsomorphismsIterator" );
DeclareOperation( "AllIsomorphismsNumber", [ IsGroup, IsGroup ] );
DeclareOperation( "AllIsomorphisms", [ IsGroup, IsGroup ] );
#############################################################################
## These functions provide an iterator for all subgroups of a group.
##
#O AllSubgroupsIterator( <G> )
#F DoAllSubgroupsIterator
##
DeclareOperation( "AllSubgroupsIterator", [ IsGroup ] );
DeclareGlobalName( "DoAllSubgroupsIterator" );
#############################################################################
## These functions provide ways of combining two iterators into one
##
#O CartesianIterator( <it1> <it2> )
#F DoCartesianIterator
#O UnorderedPairsIterator( <it> )
#F DoUnorderedPairsIterator
##
DeclareOperation( "CartesianIterator", [ IsIterator, IsIterator ] );
DeclareGlobalName( "DoCartesianIterator" );
DeclareOperation( "UnorderedPairsIterator", [ IsIterator ] );
DeclareGlobalName( "DoUnorderedPairsIterator" );
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