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129 lines
2.6 KiB
Plaintext
129 lines
2.6 KiB
Plaintext
/*
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* Harbour Project source code:
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* example/test code for object destructors
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*
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* Copyright 2006 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
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* www - http://harbour-project.org
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*
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*/
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#include "hbclass.ch"
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MEMVAR P
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PROCEDURE Main()
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LOCAL bError
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PUBLIC P := NIL
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bError := ErrorBlock( {| oErr | myErrorHandler( oErr ) } )
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? "First simple tests when object is not destroyed by GC"
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? "====================================================="
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SIMPLETEST( 0 )
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SIMPLETEST( 1 )
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SIMPLETEST( 2 )
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SIMPLETEST( 3 )
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?
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? "Now object will be destroyed by GC"
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? "=================================="
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GCFREETEST( 0 )
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GCFREETEST( 1 )
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GCFREETEST( 2 )
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GCFREETEST( 3 )
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ErrorBlock( bError )
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?
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? "*** END OF TEST ***"
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RETURN
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STATIC PROCEDURE SIMPLETEST( type )
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LOCAL o
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?
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? "=> o := myClass():new( " + hb_ntos( type ) + " )"
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o := myClass():new( type )
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? "=> o:className() ->", o:className()
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? "=> o := NIL"
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BEGIN SEQUENCE
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o := NIL
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END SEQUENCE
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RETURN
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STATIC PROCEDURE GCFREETEST( type )
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LOCAL o, a
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?
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? "=> o := myClass():new( " + hb_ntos( type ) + " )"
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o := myClass():new( type )
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? "=> o:className() ->", o:className()
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? "=> create corss reference: a := { o, NIL }; a[ 2 ] := a; a := NIL"
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a := { o, NIL }; a[ 2 ] := a; a := NIL
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? "=> o := NIL"
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BEGIN SEQUENCE
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o := NIL
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END SEQUENCE
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? "=> hb_gcAll()"
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BEGIN SEQUENCE
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hb_gcAll()
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END SEQUENCE
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RETURN
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STATIC FUNCTION myErrorHandler( oErr )
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? "Error ->", hb_ntos( oErr:gencode ), ;
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oErr:description + ":", oErr:operation
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BREAK oErr
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RETURN NIL
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CREATE CLASS myClass
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VAR TYPE
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VAR var1
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CLASS VAR var2
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METHOD INIT
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DESTRUCTOR dtor
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END CLASS
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METHOD INIT( type ) CLASS myClass
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? "Hi, I'm INIT method of class:", self:classname()
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::type := type
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RETURN self
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PROCEDURE DTOR CLASS myClass
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? " Hi, I'm desturctor of class: ", self:classname()
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IF ::type == 1
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? " I'm storing reference to self in instance variable."
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? " Bad practice but safe in Harbour because it will be destroyed."
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::var1 := self
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ELSEIF ::Type == 2
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? " I'm storing reference to self in class variable."
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? " It's programmer bug which should cause RT error."
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::var2 := self
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ELSEIF ::Type == 3
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? " I'm storing reference to self in public variable."
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? " It's programmer bug which should cause RT error."
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P := self
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ELSE
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? " I do not store any references to self."
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? " It's a safe destructor."
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ENDIF
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RETURN
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