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annotate ThreadSafeLookup.hpp @ 115:404795616b1e default tip

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Added a lot of common files to ignore
author Tom Fredrik Blenning Klaussen <bfg@bfgconsult.no>
date Sat, 25 Mar 2017 17:43:57 +0100
parents 60c1e0a2cacf
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1 #ifndef THREADSAFELOOKUP_HPP
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2 #define THREADSAFELOOKUP_HPP
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4 #include <QtCore/QHash>
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5 #include <QtCore/QMutex>
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6
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7 #include <boost/optional.hpp>
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8
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9 struct Nothing {
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10 Nothing() {}
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11 Nothing(const Nothing&) {}
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12 Nothing(const Nothing*) {}
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13 };
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15 template <bool Locks>
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16 struct Locking {
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17 typedef QMutex Lock_t;
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18 typedef QMutexLocker Locker_t;
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19 };
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21 template <>
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22 struct Locking<false> {
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23 typedef Nothing Lock_t;
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24 typedef Nothing Locker_t;
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25 };
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27 template <typename Key_t, typename Value_t, bool isLocking = true>
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28 class ThreadSafeLookup {
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30 private:
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31 typedef QHash<Key_t, Value_t> map_t;
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32 map_t map;
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34 mutable typename Locking<isLocking>::Lock_t masterLock;
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35 public:
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37 boost::optional<Value_t> value(const Key_t& key) const
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38 {
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39 boost::optional<Value_t> retVal;
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40 typename Locking<isLocking>::Locker_t lock(&masterLock);
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41 typename map_t::const_iterator c = map.find(key);
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42 if (c != map.end()) {
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43 retVal = c.value();
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44 }
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45 return retVal;
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46 }
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47
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48 bool insert(const Key_t& key, const Value_t& value, bool forceInsert = false)
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49 {
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50 typename Locking<isLocking>::Locker_t lock(&masterLock);
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51 typename map_t::iterator c = map.find(key);
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52 bool exists = (c != map.end());
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54 if (exists) {
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55 c.value() = value;
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56 }
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57 else {
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58 map.insert(key, value);
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59 }
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60 return exists;
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61 }
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62 };
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64 #endif //THREADSAFELOOKUP_HPP