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Is it possible and resonable to use Boost ICL instead of for_each in case of selecting a service for request?
#include <boost/range/numeric.hpp>
#include <boost/range/algorithm.hpp>
#include <boost/range/adaptors.hpp>

typedef std::vector<std::string> args_t;
typedef std::map<std::string, args_t> service_map;

struct applicable
{
    template <typename T>
        applicable(const T& args) : _args(args) { }

    bool operator()(const service_map::value_type& svc) const
    {
        for (auto& a:_args)
            if (svc.second.end() == boost::find(svc.second, a))
                return false;
        return true;
    }
  private: args_t _args;
};

int main(int argc, const char *argv[])
{
    using namespace boost::adaptors;
    static const service_map services {
        { "A", { "1","2","3" } },
        { "B", { "2","3","4" } },
        { "C", { "3","4","5" } },
        { "D", { "4","5","6" } }
    };

    const std::string label = "request: ";

    for (const auto& req : std::list<args_t> { {"5"}, {"4","3"}, {"1","3"} })
    {
        std::cout << boost::accumulate(req, label) << std::endl;

        for (auto& svc : services | filtered(applicable(req)))
            std::cout << "applicable: " << svc.first << std::endl;
    }
}

request: 5
applicable: C
applicable: D
request: 43
applicable: B
applicable: C
request: 13
applicable: A