Missing cast to array type

[roniinterconetica]

Hi I'm not sure if is missing or just not clear, I need to ger from redis, the result of "LARANGE key 0 -1" redis command. But I can not make any cast as_array() or just response.as<std::vevtor std::string >();

How should I parse the result of a LRANGE command ?
Thanks !

[tdv]

Hi.

Sorry,I've just seen your message.

Taking an array from the response is not so easy at first glance. The array is a complex structure and --according to the gist of the library-- in order to get items of the complex structure there is a way through the visiting types of the response. Why so? The common idea was to provide the most common approach to work with a set of the different responses.

Considering, combining, and playing with the examples you could do something like I've made below

// STD
#include <cstdlib>
#include <iostream>

#include <redis-cpp/stream.h>
#include <redis-cpp/execute.h>

namespace respds = rediscpp::resp::deserialization;

void print_value(respds::array::item_type const &value, std::ostream &stream)
{
    std::visit(rediscpp::resp::detail::overloaded{
            [&stream] (respds::simple_string const &val)
            { stream << "Simple string: " << val.get() << std::endl; },
            [&stream] (respds::error_message const &val)
            { stream << "Error message: " << val.get() << std::endl; },
            [&stream] (respds::bulk_string const &val)
            { stream << "Bulk string: " << val.get() << std::endl; },
            [&stream] (respds::integer const &val)
            { stream << "Integer: " << val.get() << std::endl; },
            [&stream] (respds::array const &val)
            {
                stream << "----- Array -----" << std::endl;
                for (auto const &i : val.get())
                    print_value(i, stream);
                stream << "-----------------" << std::endl;
            },
            [&stream] (auto const &)
            { stream << "Unexpected value type." << std::endl; }
        }, value);
}

int main()
{
    try
    {
        auto stream = rediscpp::make_stream("localhost", "6379");

        auto const key = "mylist";

        for (int i = 0 ; i < 10 ; ++i)
        {
            auto response = rediscpp::execute(*stream, "RPUSH",
                key, "Value " + std::to_string(i));

            std::cout << "Set key '" << key << "': " << response.as<std::int32_t>() << std::endl;
        }

        auto response = rediscpp::execute(*stream, "LRANGE", key, "-100", "100");
        print_value(response.get(), std::cout);
    }
    catch (std::exception const &e)
    {
        std::cerr << "Error: " << e.what() << std::endl;
        return EXIT_FAILURE;
    }
    return EXIT_SUCCESS;
}

Regards

[tdv]

I've just added a couple of functions in order to provide convenient casting for the plain arrays (as_string_array and as_integer_array). Hopefully, that'll make easier array type casting.

[roniinterconetica]

Thank you for your response. I have implemented a function similar print_value and worked.
For me is OK
Best regards and very good job