Function is_structured

dependencies/json/json.hpp:18953–18956

! @brief return whether type is structured This function returns true if and only if the JSON type is structured (array or object). @return `true` if type is structured (array or object), `false` otherwise. @complexity Constant. @exceptionsafety No-throw guarantee: this member function never throws exceptions. @liveexample{The following code exemplifies `is_str

    @since version 1.0.0
    */
    constexpr bool is_structured() const noexcept
    {
        return is_array() || is_object();
    }

    /*!
    @brief return whether value is null