nlohmann::basic_json::is_number_integer

constexpr bool is_number_integer() const noexcept;

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

Return value

#!cpp true if type is an integer or 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_integer()` for all JSON types.

```cpp
--8<-- "examples/is_number_integer.cpp"
```

Output:

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

See also

• is_number() check if the value is a number
• is_number_unsigned() check if the value is an unsigned integer number
• is_number_float() check if the value is a floating-point number

Version history

• Added in version 1.0.0.
• Extended to also return #!cpp true for unsigned integers in 2.0.0.