Function is_number

3rd/nlohmann_json/single_include/nlohmann/json.hpp:20104–20107

! @brief return whether value is a number This function returns true if and only if the JSON value is a number. This includes both integer (signed and unsigned) and floating-point values. @return `true` if type is number (regardless whether integer, unsigned integer or floating-type), `false` otherwise. @complexity Constant. @exceptionsafety No-throw guarantee: this

    @since version 1.0.0
    */
    constexpr bool is_number() const noexcept
    {
        return is_number_integer() || is_number_float();
    }

    /*!
    @brief return whether value is an integer number