weakptr.tst

#############################################################################
##
#W  weakptr.tst                GAP Library                       Steve Linton
##
##
#Y  Copyright (C)  1997, 
##
##  Exclude from testinstall.g: too sensitive to compiler idiosyncracies SL
##
gap> START_TEST("weakptr.tst");

#
# Low level access functions
#
gap> w := WeakPointerObj([1,,2^40*10^10,Z(17),[2,3,4],fail,SymmetricGroup(5),]);;
gap> Print(w,"\n");
WeakPointerObj( [ 1, , 10995116277760000000000, Z(17), 
[ 2, 3, 4 ], fail, SymmetricGroup( [ 1 .. 5 ] ) ] )
gap> LengthWPObj(w);
7
gap> List([1..7],x->IsBoundElmWPObj(w,x));
[ true, false, true, true, true, true, true ]
gap> List([1..7],x->ElmWPObj(w,x)); 
[ 1, fail, 10995116277760000000000, Z(17), [ 2, 3, 4 ], fail, 
  Sym( [ 1 .. 5 ] ) ]
gap> SetElmWPObj(w,9,[]);
gap> Print(w,"\n");
WeakPointerObj( [ 1, , 10995116277760000000000, Z(17), 
[ 2, 3, 4 ], fail, SymmetricGroup( [ 1 .. 5 ] ), , [  ] ] )
gap> UnbindElmWPObj(w,4);
gap> Print(w,"\n");
WeakPointerObj( [ 1, , 10995116277760000000000, , 
[ 2, 3, 4 ], fail, SymmetricGroup( [ 1 .. 5 ] ), , [  ] ] )
gap> UnbindElmWPObj(w,9); LengthWPObj(w);
7
gap> 1;;2;;3;;
gap> GASMAN("collect");
gap> Print(w,"\n");
WeakPointerObj( [ 1, , , , , fail ] )
gap> LengthWPObj(w);
6
gap> Print(ShallowCopy(w),"\n");
WeakPointerObj( [ 1, , , , , fail ] )

#
# Access as lists
#
gap> w[1];
1
gap> w{[2..4]} := [[1,2],E(5),311]; 
[ [ 1, 2 ], E(5), 311 ]
gap> Print(w,"\n");
WeakPointerObj( [ 1, [ 1, 2 ], E(5), 311, , fail ] )
gap> Print(StructuralCopy(w),"\n");
WeakPointerObj( [ 1, [ 1, 2 ], E(5), 311, , fail ] )
gap> Immutable(w);
[ 1, [ 1, 2 ], E(5), 311,, fail ]
gap> IsBound(w[2]);
true
gap> GASMAN("collect");
gap> IsBound(w[5]);   
false
gap> Unbind(w[2]);
gap> Print(w,"\n");
WeakPointerObj( [ 1, , E(5), 311, , fail ] )
gap> STOP_TEST( "weakptr.tst", 950000);