# libpointer\_isNull

Checks if libpointer handle points on NULL pointer.

## 📝 Syntax

* tf = isNull(h)
* tf = h.isNull()

## 📥 Input argument

* h - a libpointer handle.

## 📤 Output argument

* tf - a logical.

## 📄 Description

Checks if libpointer handle points on NULL pointer.

## 💡 Example

```matlab
p = libpointer('int8Ptr', int8([3 4]));
p.isNull()
p2 = libpointer()
p2.isNull()
isNull(p2)
```

## 🔗 See also

[libpointer](https://nelson-9.gitbook.io/nelson/markdown/en/dynamic_link/libpointer).

## 🕔 History

| Version | 📄 Description  |
| ------- | --------------- |
| 1.0.0   | initial version |