bool empty() const noexcept;

Return whether pointer points to the root document.

#!cpp true iff the JSON pointer points to the root document.

No-throw guarantee: this function never throws exceptions.

Constant.

??? example

The example shows the result of `empty` for different JSON Pointers.
 
```cpp
--8<-- "examples/json_pointer__empty.cpp"
```

Output:

```json
--8<-- "examples/json_pointer__empty.output"
```

Added in version 3.6.0.