---
name: "delbddnode"
section: "3"
platform: "linux"
package: "alliance"
version: "5.1.1-3"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/delbddnode"
---

# delbddnode(3)

deletes an unused bdd node.

## NAME

delbddnode - deletes an unused **bdd** node.

## SYNOPSYS

```
#include "bdd101.h"
void delbddnode( BddSystem, BddNode )
  bddsystem ∗BddSystem;
  bddnode   ∗BddNode;
```

## PARAMETERS

- *BddSystem*

  The **bdd** system.

- *BddNode*

  The **bdd** node.

## DESCRIPTION

**delbddnode** tries to delete the **bdd** node *BddNode* and its children, if they have not external reference, in the **bdd** system *BddSystem*. If a null pointer is given, the default **bdd** system is used. The use of this function is not recommended because, it takes time. It is better to call the *decbddrefext* function, and do a garbage collection with the *garbagebddsystem* function.\

## RETURN VALUE

**delbddnode** returns nothing.

## 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 );
   delbddnode( (bddsystem ∗)0, decbddrefext( BddNode ) );
   /* displays (not i0) */
   viewablexpr( Expr, ABL_VIEW_VHDL );
   freeablexpr( Expr );
   destroybddsystem( (bddsystem ∗)0 );
   destroybddcircuit( (bddcircuit ∗)0 );
```

## SEE ALSO

[**bdd**(1)](/bdd/1.md)