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1.3 KiB
1.3 KiB
nlohmann::basic_json::is_number
constexpr bool is_number() const noexcept;
This function returns #!cpp true if and only if the JSON value is a number. This includes both integer (signed and
unsigned) and floating-point values.
Return value
#!cpp true if type is number (regardless whether integer, unsigned integer or floating-type), #!cpp false otherwise.
Exception safety
No-throw guarantee: this member function never throws exceptions.
Complexity
Constant.
Possible implementation
constexpr bool is_number() const noexcept
{
return is_number_integer() || is_number_float();
}
Examples
??? example
The following code exemplifies `is_number()` for all JSON types.
```cpp
--8<-- "examples/is_number.cpp"
```
Output:
```json
--8<-- "examples/is_number.output"
```
See also
- is_number_integer() check if value is an integer or unsigned integer number
- is_number_unsigned() check if value is an unsigned integer number
- is_number_float() check if value is a floating-point number
Version history
- Added in version 1.0.0.
- Extended to also return
#!cpp truefor unsigned integers in 2.0.0.