# <small>nlohmann::basic_json::</small>is_number_unsigned

```cpp
constexpr bool is_number_unsigned() const noexcept;
```

This function returns `#!cpp true` if and only if the JSON value is an unsigned integer number. This excludes
floating-point and signed integer values.

If [`number_unsigned_t`](number_unsigned_t.md) is the same type as [`number_integer_t`](number_integer_t.md), every
integer is stored as `number_integer_t`, and this function always returns `#!cpp false`.
    
## Return value

`#!cpp true` if type is an unsigned integer number, `#!cpp false` otherwise.

## Exception safety

No-throw guarantee: this member function never throws exceptions.

## Complexity

Constant.

## Examples

??? example

    The following code exemplifies `is_number_unsigned()` for all JSON types.
    
    ```cpp
    --8<-- "examples/is_number_unsigned.cpp"
    ```
    
    Output:
    
    ```json
    --8<-- "examples/is_number_unsigned.output"
    ```

## See also

- [`is_number()`](is_number.md) - check if the value is a number
- [`is_number_integer()`](is_number_integer.md) - check if the value is an integer or unsigned integer number
- [`is_number_float()`](is_number_float.md) - check if the value is a floating-point number
- [`basic_json_view::is_number_unsigned`](../basic_json_view/is_number_unsigned.md) - the same check on a zero-copy view
- [Types](../../features/types/index.md) - the JSON value types and how they are stored
- [Number Handling](../../features/types/number_handling.md) - how numbers are stored and converted

## Version history

- Added in version 2.0.0.