HelpQuery.hpp

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#ifndef _IDENTT_UTILS_HELPQUERY_HPP_
#define _IDENTT_UTILS_HELPQUERY_HPP_

#include <string>
#include <vector>
#include <algorithm>
#include <memory>
#include <boost/thread/locks.hpp>
#include <boost/thread/shared_mutex.hpp>

namespace identt {
namespace utils {

class HelpQuery {
public:
    struct HelpT {
        const unsigned int scope;
        const std::string route;
        const std::vector<std::string> desc;
    };

    using pointer=std::shared_ptr<HelpQuery>;
    using LockT = boost::shared_mutex;
    using WriteLockT = boost::unique_lock< LockT >;
    using ReadLockT = boost::shared_lock< LockT >;
    using HelpListT = std::vector<HelpT>;

    HelpQuery(const HelpQuery&) = delete;
    HelpQuery& operator=(const HelpQuery&) = delete;


    HelpQuery() = default;

    virtual ~HelpQuery () {}

    void add(HelpT h)
    {
        WriteLockT lock (shared_lock);
        helplist.emplace_back(h);
    }

    HelpListT get(const unsigned int scope)
    {
        HelpListT hl;
        ReadLockT lock (shared_lock);
        std::copy_if( helplist.begin() , helplist.end(), std::back_inserter(hl), [scope](const HelpT& h) {
            return (h.scope & scope);
        });
        return hl;
    }

protected:
    HelpListT helplist;
    LockT shared_lock;

};

} // namespace utils
} // namespace identt
#endif /* _IDENTT_UTILS_HELPQUERY_HPP_ */