how to write a template converts vector to Json::Value (jsoncpp)

Question

i wrote a template(like below) but it fails to compile

template class iterable>
Json::Value iterable2json(const itera         


        

Answer 1

The problem is that compiler can't deduce the type t as it is indirectly determined through the template template parameter. However, there is actually no need to do anything like that in the first place! The following works just fine:

template <typename Iterable>
Json::Value iterable2json(Iterable const& cont) {
    Json::Value v;
    for (auto&& element: cont) {
        v.append(element);
     }
     return v;
}

(well, since I don't have the Json library you are using I havn't tried to compile it but I'd think it should be fine).