json/api/json_pointer/empty.md

nlohmann::json_pointer::empty

bool empty() const noexcept;

Return whether the pointer points to the root document.

Return value

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

Exception safety

No-throw guarantee: this function never throws exceptions.

Complexity

Constant.

Examples

??? 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"
```

See also

• front return first reference token
• back return last reference token
• to_string return a string representation of the JSON pointer

Version history

Added in version 3.6.0.