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.
#!cpp true
if type is number (regardless whether integer, unsigned integer or floating-type), #!cpp false
otherwise.
No-throw guarantee: this member function never throws exceptions.
Constant.
constexpr bool is_number() const noexcept { return is_number_integer() || is_number_float(); }
??? example
The following code exemplifies `is_number()` for all JSON types. ```cpp --8<-- "examples/is_number.cpp" ``` Output: ```json --8<-- "examples/is_number.output" ```
#!cpp true
for unsigned integers in 2.0.0.