Helpers.hh

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#ifndef __NCPP_INTERNAL_HELPERS_HH
#define __NCPP_INTERNAL_HELPERS_HH
 
#include <functional>
#include <map>
#include <mutex>
 
namespace ncpp::internal
{
    class Helpers
    {
    public:
        template<typename TKey, typename TValue>
        static TValue lookup_map_entry (std::map<TKey,TValue> *&_map, std::mutex &_mutex, TKey _key, std::function<TValue (TKey)> create_value)
        {
            std::lock_guard<std::mutex> lock (_mutex);
            if (_map == nullptr) {
                _map = new std::map<TKey,TValue> ();
            }
 
            TValue ret;
            auto entry = _map->find (_key);
            if (entry == _map->end ()) {
                ret = create_value (_key);
            } else {
                ret = entry->second;
            }
 
            return ret;
        }
 
        template<typename TKey, typename TValue>
        static void remove_map_entry (std::map<TKey,TValue> *&_map, std::mutex &_mutex, TKey _key)
        {
            std::lock_guard<std::mutex> lock (_mutex);
            if (_map == nullptr)
                return;
 
            auto entry = _map->find (_key);
            if (entry == _map->end ())
                return;
 
            _map->erase (entry);
        }
    };
}
#endif