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unsetbddrefext

NAME

unsetbddrefext - increments the internal reference, and decrements the external reference of a bdd node.

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SYNOPSYS

 #include "bdd101.h"
 bddnode *unsetbddrefext( BddNode )
   bddnode *BddNode;
 

PARAMETERS

BddNode

The bdd node.

DESCRIPTION

unsetbddrefext increments the number of internal reference of the bdd node BddNode and decrements its number of external reference.

RETURN VALUE

unsetbddrefext returns the BddNode pointer.

ERRORS

"negative reference, index xxx error !"

The BddNode must have a postive number of external reference.

EXAMPLE

 #include "bdd101.h"
    bddsystem  *BddSystem;
    bddcircuit *BddCircuit;
    bddnode    *BddNode;
    chain_list *Expr;
    BddSystem  = createbddsystem( 100, 1000, 100, 50000 );
    BddCircuit = createbddcircuit( "hello_world", 10, 10, BddSystem );
    BddNode = addbddcircuitin( (bddcircuit *)0, "i0", 0, BDD_IN_MODE_FIRST );
    BddNode = addbddnode( (bddsystem *)0, BddNode->INDEX, BddNode->LOW, BddNode->HIGH );
    Expr = convertbddcircuitabl( (bddcircuit *)0, BddNode );
    incbddrefext( BddNode );
    unsetbddrefext( BddNode );
    /* displays Node VAR: 0  INDEX: 2  MARK: 0  REF_EXT: 0  REF_INT: 1 */
    viewbddnode( (bddsystem *)0, BddNode );
    /* displays (not i0) */
    viewablexpr( Expr, ABL_VIEW_VHDL );
    freeablexpr( Expr );
    destroybddsystem( (bddsystem *)0 );
    destroybddcircuit( (bddcircuit *)0 );
 

SEE ALSO

bdd(1)

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