1# basic_json::is_number_integer 2 3```cpp 4constexpr bool is_number_integer() const noexcept; 5``` 6 7This function returns `#!cpp true` if and only if the JSON value is a signed or unsigned integer number. This excludes 8floating-point values. 9 10## Return value 11 12`#!cpp true` if type is an integer or unsigned integer number, `#!cpp false` otherwise. 13 14## Exception safety 15 16No-throw guarantee: this member function never throws exceptions. 17 18## Complexity 19 20Constant. 21 22## Example 23 24??? example 25 26 The following code exemplifies `is_number_integer()` for all JSON types. 27 28 ```cpp 29 --8<-- "examples/is_number_integer.cpp" 30 ``` 31 32 Output: 33 34 ```json 35 --8<-- "examples/is_number_integer.output" 36 ``` 37 38## Version history 39 40- Added in version 1.0.0. 41- Extended to also return `#!cpp true` for unsigned integers in 2.0.0. 42