First attempt to make RAII cursors, no tests yet

CHANGELOG.md

@@ -1,9 +1,13 @@
 # Changelog
 
+## LMDBAL 0.5.2 (October 21, 2023)
+### Improvements
+- RAII cursors
+
 ## LMDBAL 0.5.1 (October 21, 2023)
 ### Improvements
 - RAII transactions
-- reduced overhead for private transaction finctions
+- reduced overhead for private transaction functions
 
 ### Bug fixes
 - bug fix with cache fallthough

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.16)
 
 project(LMDBAL
-  VERSION 0.5.1
+  VERSION 0.5.2
   DESCRIPTION "LMDB (Lightning Memory-Mapped Database Manager) Abstraction Layer"
   LANGUAGES CXX
 )

packaging/Archlinux/PKGBUILD

@@ -1,6 +1,6 @@
 # Maintainer: Yury Gubich <blue@macaw.me>
 pkgname=lmdbal
-pkgver=0.5.1
+pkgver=0.5.2
 pkgrel=1
 pkgdesc="LMDB Abstraction Layer, qt5 version"
 arch=('i686' 'x86_64')

src/cursor.h

@@ -38,37 +38,49 @@ private:
         openedPrivate       /**<    - opened with private transaction, only current storage will be notified when cursor is closed*/
     };
 
+public:
+    Cursor();
     Cursor(Storage<K, V>* parent);
+    Cursor(const Cursor& other) = delete;
+    Cursor(Cursor&& other);
     ~Cursor();
 
-public:
+    Cursor& operator = (const Cursor& other) = delete;
-    void open() const;
+    Cursor& operator = (Cursor&& other);
-    void open(const Transaction& transaction) const;
+
-    void renew() const;
+    void open();
-    void renew(const Transaction& transaction) const;
+    void open(const Transaction& transaction);
-    void close() const;
+    void renew();
+    void renew(const Transaction& transaction);
+    void close();
     bool opened() const;
+    bool empty() const;
 
-    std::pair<K, V> first() const;
+    void drop();
-    std::pair<K, V> last() const;
+
-    std::pair<K, V> next() const;
+    std::pair<K, V> first();
-    std::pair<K, V> prev() const;
+    std::pair<K, V> last();
+    std::pair<K, V> next();
+    std::pair<K, V> prev();
     std::pair<K, V> current() const;
+    bool set(const K& target);
 
-    void first(K& key, V& value) const;
+    void first(K& key, V& value);
-    void last(K& key, V& value) const;
+    void last(K& key, V& value);
-    void next(K& key, V& value) const;
+    void next(K& key, V& value);
-    void prev(K& key, V& value) const;
+    void prev(K& key, V& value);
     void current(K& key, V& value) const;
 
 private:
-    void terminated() const;
+    void dropped();
+    void terminated();
     void operateCursorRead(K& key, V& value, MDB_cursor_op operation, const std::string& methodName, const std::string& operationName) const;
 
 private:
     Storage<K, V>* storage;
-    mutable MDB_cursor* cursor;
+    MDB_cursor* cursor;
-    mutable State state;
+    State state;
+    uint32_t id;
 
     inline static const std::string openCursorMethodName = "Cursor::open";      /**<\brief member function name, just for exceptions*/
     inline static const std::string closeCursorMethodName = "Cursor::close";    /**<\brief member function name, just for exceptions*/

src/cursor.hpp

@@ -41,6 +41,8 @@
  * You are not supposed to instantiate or destory instances of this class yourself!
  */
 
+static uint32_t idCounter = 0;
+
 /**
  * \brief Creates a cursor
  *
@@ -50,9 +52,74 @@ template<class K, class V>
 LMDBAL::Cursor<K, V>::Cursor(Storage<K, V>* parent):
     storage(parent),
     cursor(nullptr),
-    state(closed)
+    state(closed),
+    id(++idCounter)
+{
+    storage->cursors[id] = this;
+}
+
+/**
+ * \brief Creates an empty cursor.
+ *
+ * It's not usable, but can exist just to be a target of moves
+ */
+template<class K, class V>
+LMDBAL::Cursor<K, V>::Cursor():
+    storage(nullptr),
+    cursor(nullptr),
+    state(closed),
+    id(0)
 {}
 
+/**
+ * \brief Moves from another cursor
+ */
+template<class K, class V>
+LMDBAL::Cursor<K, V>::Cursor(Cursor&& other):
+    storage(other.storage),
+    cursor(other.cursor),
+    state(other.state),
+    id(other.id)
+{
+    if (id != 0)
+        storage->cursors[id] = this;
+
+    other.cursor = nullptr;
+    other.storage = nullptr;
+    other.id = 0;
+    other.state = closed;
+}
+
+/**
+ * \brief A private function that turns cursor into an empty one
+ *
+ * This function is called from LMDBAL::Storage, when it gets destroyed, but still has some valid.
+ * Those cursors will become empty, and can't be used anymore
+ */
+template<class K, class V>
+LMDBAL::Cursor<K, V>& LMDBAL::Cursor<K, V>::operator = (Cursor&& other) {
+    terminated();
+
+    if (id != 0)
+        storage->cursors.erase(id);
+
+    storage = other.storage;
+    cursor = other.cursor;
+    state = other.state;
+    id = other.id;
+
+    if (id != 0) {
+        other.cursor = nullptr;
+        other.storage = nullptr;
+        other.id = 0;
+        other.state = closed;
+
+        storage->cursors[id] = this;
+    }
+
+    return *this;
+}
+
 /**
  * \brief Destroys a cursor
  *
@@ -61,13 +128,58 @@ LMDBAL::Cursor<K, V>::Cursor(Storage<K, V>* parent):
 template<class K, class V>
 LMDBAL::Cursor<K, V>::~Cursor () {
     close();
+
+    if (id != 0)
+        storage->cursors.erase(id);
+}
+
+/**
+ * \brief Turns cursor into an empty one, releasing resources
+ *
+ * This function is called from LMDBAL::Storage, when it gets destroyed, but still has some valid.
+ * Those cursors will become empty, and can't be used anymore
+ */
+template<class K, class V>
+void LMDBAL::Cursor<K, V>::drop () {
+    close();
+
+    if (id != 0)
+        storage->cursors.erase(id);
+
+    cursor = nullptr;
+    storage = nullptr;
+    id = 0;
+}
+
+/**
+ * \brief A private method that turns cursor into an empty one
+ *
+ * This function is called from LMDBAL::Storage, when it gets destroyed, but still has some valid.
+ * Those cursors will become empty, and can't be used anymore
+ */
+template<class K, class V>
+void LMDBAL::Cursor<K, V>::dropped () {
+    terminated();
+    cursor = nullptr;
+    storage = nullptr;
+    id = 0;
+}
+
+/**
+ * \brief Returns true if the cursor is empty
+ *
+ * Empty cursors can't be used, they can be only targets of move operations
+ */
+template<class K, class V>
+bool LMDBAL::Cursor<K, V>::empty () const {
+    return id == 0;
 }
 
 /**
  * \brief A private function the storage owning this cursor will call to inform this cursor that the thansaction needs to be aborted
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::terminated () const {
+void LMDBAL::Cursor<K, V>::terminated () {
     close();        //for now it's the same, but if I ever going to make writable cursor - here is where it's gonna be different
 }
 
@@ -82,9 +194,13 @@ void LMDBAL::Cursor<K, V>::terminated () const {
  *
  * \exception LMDBAL::Closed        thrown if you try to open the cursor on a closed database
  * \exception LMDBAL::Unknown       thrown if there was a problem opening the cursor by the lmdb, or to begin a transaction
+ * \exception LMDBAL::CursorEmpty   thrown if the cursor was empty
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::open () const {
+void LMDBAL::Cursor<K, V>::open () {
+    if (empty())
+        throw CursorEmpty(openCursorMethodName);
+
     storage->ensureOpened(openCursorMethodName);
     switch (state) {
         case closed: {
@@ -115,9 +231,13 @@ void LMDBAL::Cursor<K, V>::open () const {
  * \exception LMDBAL::Closed                thrown if you try to open the cursor on a closed database
  * \exception LMDBAL::Unknown               thrown if there was a problem opening the cursor by the lmdb
  * \exception LMDBAL::TransactionTerminated thrown if the passed transaction not active, any action with it's inner ID is an error
+ * \exception LMDBAL::CursorEmpty           thrown if the cursor was empty
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::open (const Transaction& transaction) const {
+void LMDBAL::Cursor<K, V>::open (const Transaction& transaction) {
+    if (empty())
+        throw CursorEmpty(openCursorMethodName);
+
     storage->ensureOpened(openCursorMethodName);
     TransactionID txn = storage->extractTransactionId(transaction, openCursorMethodName);
     switch (state) {
@@ -148,9 +268,13 @@ void LMDBAL::Cursor<K, V>::open (const Transaction& transaction) const {
  *
  * \exception LMDBAL::Closed        thrown if you try to renew the cursor on a closed database
  * \exception LMDBAL::Unknown       thrown if there was a problem beginning new transaction or if there was a problem renewing the cursor by lmdb
+ * \exception LMDBAL::CursorEmpty   thrown if the cursor was empty
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::renew () const {
+void LMDBAL::Cursor<K, V>::renew () {
+    if (empty())
+        throw CursorEmpty(openCursorMethodName);
+
     storage->ensureOpened(renewCursorMethodName);
     switch (state) {
         case openedPrivate: {
@@ -191,9 +315,13 @@ void LMDBAL::Cursor<K, V>::renew () const {
  * \exception LMDBAL::Closed                thrown if you try to renew the cursor on a closed database
  * \exception LMDBAL::Unknown               thrown if there was a problem renewing the cursor by lmdb
  * \exception LMDBAL::TransactionTerminated thrown if the passed transaction not active, any action with it's inner ID is an error
+ * \exception LMDBAL::CursorEmpty           thrown if the cursor was empty
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::renew (const Transaction& transaction) const {
+void LMDBAL::Cursor<K, V>::renew (const Transaction& transaction) {
+    if (empty())
+        throw CursorEmpty(openCursorMethodName);
+
     storage->ensureOpened(renewCursorMethodName);
     TransactionID txn = storage->extractTransactionId(transaction, renewCursorMethodName);
     switch (state) {
@@ -226,7 +354,7 @@ void LMDBAL::Cursor<K, V>::renew (const Transaction& transaction) const {
  * This function does nothing on a closed cursor.
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::close () const {
+void LMDBAL::Cursor<K, V>::close () {
     switch (state) {
         case openedPublic: {
             mdb_cursor_close(cursor);
@@ -267,7 +395,7 @@ bool LMDBAL::Cursor<K, V>::opened () const {
  * \exception LMDBAL::Unknown          thrown if there was some unexpected problem with lmdb
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::first (K& key, V& value) const {
+void LMDBAL::Cursor<K, V>::first (K& key, V& value) {
     operateCursorRead(key, value, MDB_FIRST, firstMethodName, firstOperationName);
 }
 
@@ -284,7 +412,7 @@ void LMDBAL::Cursor<K, V>::first (K& key, V& value) const {
  * \exception LMDBAL::Unknown          thrown if there was some unexpected problem with lmdb
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::last (K& key, V& value) const {
+void LMDBAL::Cursor<K, V>::last (K& key, V& value) {
     operateCursorRead(key, value, MDB_LAST, lastMethodName, lastOperationName);
 }
 
@@ -307,7 +435,7 @@ void LMDBAL::Cursor<K, V>::last (K& key, V& value) const {
  * \exception LMDBAL::Unknown          thrown if there was some unexpected problem with lmdb
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::next (K& key, V& value) const {
+void LMDBAL::Cursor<K, V>::next (K& key, V& value) {
     operateCursorRead(key, value, MDB_NEXT, nextMethodName, nextOperationName);
 }
 
@@ -330,7 +458,7 @@ void LMDBAL::Cursor<K, V>::next (K& key, V& value) const {
  * \exception LMDBAL::Unknown          thrown if there was some unexpected problem with lmdb
  */
 template<class K, class V>
-void LMDBAL::Cursor<K, V>::prev (K& key, V& value) const {
+void LMDBAL::Cursor<K, V>::prev (K& key, V& value) {
     operateCursorRead(key, value, MDB_PREV, prevMethodName, prevOperationName);
 }
 
@@ -365,7 +493,7 @@ void LMDBAL::Cursor<K, V>::current (K& key, V& value) const {
  * \exception LMDBAL::Unknown          thrown if there was some unexpected problem with lmdb
  */
 template<class K, class V>
-std::pair<K, V> LMDBAL::Cursor<K, V>::first () const {
+std::pair<K, V> LMDBAL::Cursor<K, V>::first () {
     std::pair<K, V> result;
     operateCursorRead(result.first, result.second, MDB_FIRST, firstMethodName, firstOperationName);
     return result;
@@ -383,7 +511,7 @@ std::pair<K, V> LMDBAL::Cursor<K, V>::first () const {
  * \exception LMDBAL::Unknown          thrown if there was some unexpected problem with lmdb
  */
 template<class K, class V>
-std::pair<K, V> LMDBAL::Cursor<K, V>::last () const {
+std::pair<K, V> LMDBAL::Cursor<K, V>::last () {
     std::pair<K, V> result;
     operateCursorRead(result.first, result.second, MDB_LAST, lastMethodName, lastOperationName);
     return result;
@@ -407,7 +535,7 @@ std::pair<K, V> LMDBAL::Cursor<K, V>::last () const {
  * \exception LMDBAL::Unknown          thrown if there was some unexpected problem with lmdb
  */
 template<class K, class V>
-std::pair<K, V> LMDBAL::Cursor<K, V>::next () const {
+std::pair<K, V> LMDBAL::Cursor<K, V>::next () {
     std::pair<K, V> result;
     operateCursorRead(result.first, result.second, MDB_NEXT, nextMethodName, nextOperationName);
     return result;
@@ -431,7 +559,7 @@ std::pair<K, V> LMDBAL::Cursor<K, V>::next () const {
  * \exception LMDBAL::Unknown          thrown if there was some unexpected problem with lmdb
  */
 template<class K, class V>
-std::pair<K, V> LMDBAL::Cursor<K, V>::prev () const {
+std::pair<K, V> LMDBAL::Cursor<K, V>::prev () {
     std::pair<K, V> result;
     operateCursorRead(result.first, result.second, MDB_PREV, prevMethodName, prevOperationName);
     return result;

src/exceptions.cpp

@@ -72,6 +72,14 @@ std::string LMDBAL::CursorNotReady::getMessage() const {
     return msg;
 }
 
+LMDBAL::CursorEmpty::CursorEmpty(const std::string & operation):
+    Exception(),
+    operation(operation) {}
+
+std::string LMDBAL::CursorEmpty::getMessage() const {
+    return "An attempt to perform an operation \"" + operation + "\" on an empty cursor";
+}
+
 LMDBAL::Opened::Opened(const std::string& p_dbName, const std::string& p_action):
     Exception(),
     dbName(p_dbName),

src/exceptions.h

@@ -97,6 +97,23 @@ private:
     std::string tableName;
 };
 
+/**
+ * \brief Thrown if an empty cursor was somehow operated
+ */
+class CursorEmpty : public Exception {
+public:
+    /**
+     * \brief Creates exception
+     *
+     * \param operation - text name of the method that was called on an empty cursor
+     */
+    CursorEmpty(const std::string& operation);
+
+    std::string getMessage() const;
+private:
+    std::string operation;
+};
+
 /**
  * \brief Thrown if something in the database was called on opened state and it is not supported
  */

src/storage.h

@@ -29,6 +29,8 @@
 
 class BaseTest;
 class DuplicatesTest;
+class CacheCursorTest;
+class StorageCursorTest;
 
 namespace LMDBAL {
 
@@ -113,6 +115,8 @@ template <class K, class V>
 class Storage : public iStorage {
     friend class ::BaseTest;
     friend class ::DuplicatesTest;
+    friend class ::CacheCursorTest;
+    friend class ::StorageCursorTest;
     friend class Base;
     friend class Cursor<K, V>;
 protected:
@@ -160,13 +164,13 @@ public:
     virtual uint32_t addRecords(const std::map<K, V>& data, bool overwrite = false);
     virtual uint32_t addRecords(const std::map<K, V>& data, const WriteTransaction& txn, bool overwrite = false);
 
-    Cursor<K, V>* createCursor();
+    Cursor<K, V> createCursor();
-    void destroyCursor(Cursor<K, V>* cursor);
+    void destroyCursor(Cursor<K, V>& cursor);
 
 protected:
     mutable Serializer<K> keySerializer;        /**<\brief internal object that would serialize and deserialize keys*/
     mutable Serializer<V> valueSerializer;      /**<\brief internal object that would serialize and deserialize values*/
-    std::set<Cursor<K, V>*> cursors;            /**<\brief a set of cursors that has been created under this storage*/
+    std::map<uint32_t, Cursor<K, V>*> cursors;  /**<\brief a set of cursors that has been created under this storage*/
 
     int open(MDB_txn* transaction) override;
     void close() override;

src/storage.hpp

@@ -58,8 +58,8 @@ LMDBAL::Storage<K, V>::Storage(Base* parent, const std::string& name, bool dupli
  */
 template<class K, class V>
 LMDBAL::Storage<K, V>::~Storage() {
-    for (Cursor<K, V>* cursor : cursors)
+    for (const std::pair<const uint32_t, Cursor<K, V>*>& pair : cursors)
-        delete cursor;
+        pair.second->dropped();
 }
 
 /**
@@ -1013,8 +1013,8 @@ int LMDBAL::Storage<K, V>::open(MDB_txn* transaction) {
  */
 template<class K, class V>
 void LMDBAL::Storage<K, V>::close() {
-    for (Cursor<K, V>* cursor : cursors)
+    for (const std::pair<const uint32_t, Cursor<K, V>*>& pair : cursors)
-        cursor->terminated();
+        pair.second->terminated();
 
     iStorage::close();
 }
@@ -1025,11 +1025,8 @@ void LMDBAL::Storage<K, V>::close() {
  * \returns LMDBAL::Cursor for this storage and returs you a pointer to a created cursor
  */
 template<class K, class V>
-LMDBAL::Cursor<K, V>* LMDBAL::Storage<K, V>::createCursor() {
+LMDBAL::Cursor<K, V> LMDBAL::Storage<K, V>::createCursor() {
-    Cursor<K, V>* cursor = new Cursor<K, V>(this);
+    return Cursor<K, V>(this);
-    cursors.insert(cursor);
-
-    return cursor;
 }
 
 /**
@@ -1056,25 +1053,6 @@ uint32_t LMDBAL::Storage<K, V>::flags() const {
     return result;
 }
 
-/**
- * \brief Destroys cursor
- *
- * This a normal way to discard a cursor you don't need anymore
- *
- * \param[in] cursor    a pointer to a cursor you want to destroy
- *
- * \exception LMDBAL::Unknown  thrown if you try to destroy something that this storage didn't create
- */
-template<class K, class V>
-void LMDBAL::Storage<K, V>::destroyCursor(Cursor<K, V>* cursor) {
-    typename std::set<Cursor<K, V>*>::const_iterator itr = cursors.find(cursor);
-    if (itr == cursors.end())
-        throwUnknown("An attempt to destroy a cursor the storage doesn't own");
-
-    cursors.erase(itr);
-    delete cursor;
-}
-
 /**
  * \brief A private virtual method that cursor calls when he reads a record, does nothing here but populates the LMDBAL::Cache
  *

test/cachecursor.cpp

@@ -29,13 +29,10 @@ protected:
         db->removeDirectory();
         delete db;
         db = nullptr;
-        cursor = nullptr;
-        emptyCursor = nullptr;
     }
 
     static LMDBAL::Base* db;
-    static LMDBAL::Cursor<uint64_t, std::string>* cursor;
+    static LMDBAL::Cursor<uint64_t, std::string> cursor;
-    static LMDBAL::Cursor<uint64_t, std::string>* emptyCursor;
     static LMDBAL::Transaction transaction;
 
     LMDBAL::Cache<uint64_t, std::string>* cache;
@@ -43,8 +40,7 @@ protected:
 };
 
 LMDBAL::Base* CacheCursorTest::db = nullptr;
-LMDBAL::Cursor<uint64_t, std::string>* CacheCursorTest::cursor = nullptr;
+LMDBAL::Cursor<uint64_t, std::string> CacheCursorTest::cursor;
-LMDBAL::Cursor<uint64_t, std::string>* CacheCursorTest::emptyCursor = nullptr;
 LMDBAL::Transaction CacheCursorTest::transaction;
 
 static const std::map<uint64_t, std::string> data({
@@ -67,21 +63,20 @@ TEST_F(CacheCursorTest, PopulatingTheTable) {
 
 TEST_F(CacheCursorTest, Creation) {
     cursor = cache->createCursor();
-    emptyCursor = emptyCache->createCursor();
 
-    EXPECT_THROW(cursor->first(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.first(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->last(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.last(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->next(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.next(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->prev(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.prev(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->current(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.current(), LMDBAL::CursorNotReady);
 
-    cursor->open();
+    cursor.open();
 }
 
 TEST_F(CacheCursorTest, FirstPrivate) {
     EXPECT_EQ(cache->count(), data.size());
 
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -94,16 +89,16 @@ TEST_F(CacheCursorTest, NextPrivate) {
 
     reference++;
     for (; reference != data.end(); ++reference) {
-        std::pair<uint64_t, std::string> element = cursor->next();
+        std::pair<uint64_t, std::string> element = cursor.next();
         EXPECT_EQ(element.first, reference->first);
         EXPECT_EQ(element.second, reference->second);
         EXPECT_EQ(cache->count(), data.size());
     }
 
-    EXPECT_THROW(cursor->next(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.next(), LMDBAL::NotFound);
     EXPECT_EQ(cache->count(), data.size());
 
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -114,7 +109,7 @@ TEST_F(CacheCursorTest, NextPrivate) {
 TEST_F(CacheCursorTest, LastPrivate) {
     EXPECT_EQ(cache->count(), data.size());
 
-    std::pair<uint64_t, std::string> element = cursor->last();
+    std::pair<uint64_t, std::string> element = cursor.last();
     std::map<uint64_t, std::string>::const_reverse_iterator reference = data.rbegin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -127,16 +122,16 @@ TEST_F(CacheCursorTest, PrevPrivate) {
 
     reference++;
     for (; reference != data.rend(); ++reference) {
-        std::pair<uint64_t, std::string> element = cursor->prev();
+        std::pair<uint64_t, std::string> element = cursor.prev();
         EXPECT_EQ(element.first, reference->first);
         EXPECT_EQ(element.second, reference->second);
         EXPECT_EQ(cache->count(), data.size());
     }
 
-    EXPECT_THROW(cursor->prev(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.prev(), LMDBAL::NotFound);
     EXPECT_EQ(cache->count(), data.size());
 
-    std::pair<uint64_t, std::string> element = cursor->last();
+    std::pair<uint64_t, std::string> element = cursor.last();
     reference = data.rbegin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -145,29 +140,29 @@ TEST_F(CacheCursorTest, PrevPrivate) {
 }
 
 TEST_F(CacheCursorTest, CurrentPrivate) {
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    element = cursor->current();
+    element = cursor.current();
     EXPECT_EQ(cache->count(), data.size());
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    cursor->next();
+    cursor.next();
-    element = cursor->current();
+    element = cursor.current();
     ++reference;
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    cursor->next();
+    cursor.next();
-    cursor->next();
+    cursor.next();
-    cursor->prev();
+    cursor.prev();
-    element = cursor->current();
+    element = cursor.current();
     ++reference;
     ++reference;
     --reference;
@@ -178,16 +173,15 @@ TEST_F(CacheCursorTest, CurrentPrivate) {
 }
 
 TEST_F(CacheCursorTest, Destruction) {
-    cursor->close();
+    cursor.close();
 
-    EXPECT_THROW(cursor->first(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.first(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->last(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.last(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->next(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.next(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->prev(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.prev(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->current(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.current(), LMDBAL::CursorNotReady);
 
-    EXPECT_THROW(emptyCache->destroyCursor(cursor), LMDBAL::Unknown);
+    cursor = LMDBAL::Cursor<uint64_t, std::string>();
-    cache->destroyCursor(cursor);
 
     cursor = cache->createCursor();
 }
@@ -195,8 +189,8 @@ TEST_F(CacheCursorTest, Destruction) {
 TEST_F(CacheCursorTest, FirstPublic) {
     transaction = db->beginTransaction();
 
-    cursor->open(transaction);
+    cursor.open(transaction);
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -209,16 +203,16 @@ TEST_F(CacheCursorTest, NextPublic) {
 
     reference++;
     for (; reference != data.end(); ++reference) {
-        std::pair<uint64_t, std::string> element = cursor->next();
+        std::pair<uint64_t, std::string> element = cursor.next();
         EXPECT_EQ(element.first, reference->first);
         EXPECT_EQ(element.second, reference->second);
     EXPECT_EQ(cache->count(), data.size());
     }
 
-    EXPECT_THROW(cursor->next(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.next(), LMDBAL::NotFound);
     EXPECT_EQ(cache->count(), data.size());
 
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -226,7 +220,7 @@ TEST_F(CacheCursorTest, NextPublic) {
 }
 
 TEST_F(CacheCursorTest, LastPublic) {
-    std::pair<uint64_t, std::string> element = cursor->last();
+    std::pair<uint64_t, std::string> element = cursor.last();
     std::map<uint64_t, std::string>::const_reverse_iterator reference = data.rbegin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -239,15 +233,15 @@ TEST_F(CacheCursorTest, PrevPublic) {
 
     reference++;
     for (; reference != data.rend(); ++reference) {
-        std::pair<uint64_t, std::string> element = cursor->prev();
+        std::pair<uint64_t, std::string> element = cursor.prev();
         EXPECT_EQ(element.first, reference->first);
         EXPECT_EQ(element.second, reference->second);
     EXPECT_EQ(cache->count(), data.size());
     }
 
-    EXPECT_THROW(cursor->prev(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.prev(), LMDBAL::NotFound);
 
-    std::pair<uint64_t, std::string> element = cursor->last();
+    std::pair<uint64_t, std::string> element = cursor.last();
     reference = data.rbegin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -256,29 +250,29 @@ TEST_F(CacheCursorTest, PrevPublic) {
 }
 
 TEST_F(CacheCursorTest, CurrentPublic) {
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    element = cursor->current();
+    element = cursor.current();
     EXPECT_EQ(cache->count(), data.size());
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    cursor->next();
+    cursor.next();
-    element = cursor->current();
+    element = cursor.current();
     ++reference;
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    cursor->next();
+    cursor.next();
-    cursor->next();
+    cursor.next();
-    cursor->prev();
+    cursor.prev();
-    element = cursor->current();
+    element = cursor.current();
     ++reference;
     ++reference;
     --reference;
@@ -290,38 +284,39 @@ TEST_F(CacheCursorTest, CurrentPublic) {
 
 TEST_F(CacheCursorTest, CornerCases) {
     transaction.terminate();
-    EXPECT_THROW(cursor->current(), LMDBAL::Unknown);
+    EXPECT_THROW(cursor.current(), LMDBAL::Unknown);
-    cursor->close();
+    cursor.close();
 
-    emptyCursor->open();
+    LMDBAL::Cursor<uint64_t, std::string> emptyCursor = emptyCache->createCursor();
-    EXPECT_THROW(emptyCursor->first(), LMDBAL::NotFound);
+    emptyCursor.open();
-    EXPECT_THROW(emptyCursor->last(), LMDBAL::NotFound);
+    EXPECT_THROW(emptyCursor.first(), LMDBAL::NotFound);
-    EXPECT_THROW(emptyCursor->next(), LMDBAL::NotFound);
+    EXPECT_THROW(emptyCursor.last(), LMDBAL::NotFound);
-    EXPECT_THROW(emptyCursor->prev(), LMDBAL::NotFound);
+    EXPECT_THROW(emptyCursor.next(), LMDBAL::NotFound);
-    EXPECT_THROW(emptyCursor->current(), LMDBAL::Unknown);
+    EXPECT_THROW(emptyCursor.prev(), LMDBAL::NotFound);
-    emptyCursor->close();
+    EXPECT_THROW(emptyCursor.current(), LMDBAL::Unknown);
+    emptyCursor.close();
 
-    cursor->open();
+    cursor.open();
-    EXPECT_THROW(cursor->current(), LMDBAL::Unknown);       //yeah, nice thing to write in the doc
+    EXPECT_THROW(cursor.current(), LMDBAL::Unknown);       //yeah, nice thing to write in the doc
 
     std::map<uint64_t, std::string>::const_reverse_iterator breference = data.rbegin();
-    std::pair<uint64_t, std::string> element(cursor->prev());
+    std::pair<uint64_t, std::string> element(cursor.prev());
     EXPECT_EQ(element.first, breference->first);            //nice thing to write in the doc, again!
     EXPECT_EQ(element.second, breference->second);
-    element = cursor->current();
+    element = cursor.current();
     EXPECT_EQ(element.first, breference->first);
     EXPECT_EQ(element.second, breference->second);
-    EXPECT_THROW(cursor->next(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.next(), LMDBAL::NotFound);
-    cursor->close();
+    cursor.close();
 
-    cursor->open();
+    cursor.open();
-    element = cursor->next();
+    element = cursor.next();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
-    element = cursor->current();
+    element = cursor.current();
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
-    EXPECT_THROW(cursor->prev(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.prev(), LMDBAL::NotFound);
 }
 

test/duplicates.cpp

@@ -337,15 +337,15 @@ TEST_F(DuplicatesTest, GettingAllRecords) {
 
     std::map<int16_t, uint16_t> m1;
     std::set<int16_t> k1;
-    LMDBAL::Cursor<int16_t, uint16_t>* c1 = tu1->createCursor();
+    LMDBAL::Cursor<int16_t, uint16_t> c1 = tu1->createCursor();
     tu1->readAll(m1, txn);
-    c1->open(txn);
+    c1.open(txn);
 
     cycle = false;
     iterations = 0;
     do {
         try {
-            std::pair<int16_t, uint16_t> pair = c1->next();
+            std::pair<int16_t, uint16_t> pair = c1.next();
             cycle = true;
             std::pair<std::set<int16_t>::const_iterator, bool> probe = k1.insert(pair.first);
             if (probe.second) {
@@ -359,25 +359,25 @@ TEST_F(DuplicatesTest, GettingAllRecords) {
             cycle = false;
         }
     } while (cycle);
-    tu1->destroyCursor(c1);
 
     EXPECT_EQ(iterations, tu1->count(txn));
     EXPECT_EQ(k1.size(), m1.size());
     EXPECT_NE(iterations, 0);
     EXPECT_NE(k1.size(), 0);
+    c1.drop();
 
 
     std::map<std::string, int8_t> m2;
     std::set<std::string> k2;
-    LMDBAL::Cursor<std::string, int8_t>* c2 = tu2->createCursor();
+    LMDBAL::Cursor<std::string, int8_t> c2 = tu2->createCursor();
     tu2->readAll(m2, txn);
-    c2->open(txn);
+    c2.open(txn);
 
     cycle = false;
     iterations = 0;
     do {
         try {
-            std::pair<std::string, int8_t> pair = c2->next();
+            std::pair<std::string, int8_t> pair = c2.next();
             cycle = true;
             std::pair<std::set<std::string>::const_iterator, bool> probe = k2.insert(pair.first);
             if (probe.second) {
@@ -391,25 +391,25 @@ TEST_F(DuplicatesTest, GettingAllRecords) {
             cycle = false;
         }
     } while (cycle);
-    tu2->destroyCursor(c2);
 
     EXPECT_EQ(iterations, tu2->count(txn));
     EXPECT_EQ(k2.size(), m2.size());
     EXPECT_NE(iterations, 0);
     EXPECT_NE(k2.size(), 0);
+    c2.drop();
 
 
     std::map<float, float> m3;
     std::set<float> k3;
-    LMDBAL::Cursor<float, float>* c3 = tu3->createCursor();
+    LMDBAL::Cursor<float, float> c3 = tu3->createCursor();
     tu3->readAll(m3, txn);
-    c3->open(txn);
+    c3.open(txn);
 
     cycle = false;
     iterations = 0;
     do {
         try {
-            std::pair<float, float> pair = c3->next();
+            std::pair<float, float> pair = c3.next();
             cycle = true;
             std::pair<std::set<float>::const_iterator, bool> probe = k3.insert(pair.first);
             if (probe.second) {
@@ -423,25 +423,25 @@ TEST_F(DuplicatesTest, GettingAllRecords) {
             cycle = false;
         }
     } while (cycle);
-    tu3->destroyCursor(c3);
 
     EXPECT_EQ(iterations, tu3->count(txn));
     EXPECT_EQ(k3.size(), m3.size());
     EXPECT_NE(iterations, 0);
     EXPECT_NE(k3.size(), 0);
+    c3.drop();
 
 
     std::map<uint16_t, double> m4;
     std::set<uint16_t> k4;
-    LMDBAL::Cursor<uint16_t, double>* c4 = tu4->createCursor();
+    LMDBAL::Cursor<uint16_t, double> c4 = tu4->createCursor();
     tu4->readAll(m4, txn);
-    c4->open(txn);
+    c4.open(txn);
 
     cycle = false;
     iterations = 0;
     do {
         try {
-            std::pair<uint16_t, double> pair = c4->next();
+            std::pair<uint16_t, double> pair = c4.next();
             cycle = true;
             std::pair<std::set<uint16_t>::const_iterator, bool> probe = k4.insert(pair.first);
             if (probe.second) {
@@ -455,7 +455,7 @@ TEST_F(DuplicatesTest, GettingAllRecords) {
             cycle = false;
         }
     } while (cycle);
-    tu4->destroyCursor(c4);
+    c4.drop();
 
     EXPECT_EQ(iterations, tu4->count(txn));
     EXPECT_EQ(k4.size(), m4.size());

test/storagecursor.cpp

@@ -28,13 +28,10 @@ protected:
         db->removeDirectory();
         delete db;
         db = nullptr;
-        cursor = nullptr;
-        emptyCursor = nullptr;
     }
 
     static LMDBAL::Base* db;
-    static LMDBAL::Cursor<uint64_t, std::string>* cursor;
+    static LMDBAL::Cursor<uint64_t, std::string> cursor;
-    static LMDBAL::Cursor<uint64_t, std::string>* emptyCursor;
     static LMDBAL::Transaction transaction;
 
     LMDBAL::Storage<uint64_t, std::string>* table;
@@ -42,8 +39,7 @@ protected:
 };
 
 LMDBAL::Base* StorageCursorTest::db = nullptr;
-LMDBAL::Cursor<uint64_t, std::string>* StorageCursorTest::cursor = nullptr;
+LMDBAL::Cursor<uint64_t, std::string> StorageCursorTest::cursor;
-LMDBAL::Cursor<uint64_t, std::string>* StorageCursorTest::emptyCursor = nullptr;
 LMDBAL::Transaction StorageCursorTest::transaction = LMDBAL::Transaction();
 
 static const std::map<uint64_t, std::string> data({
@@ -66,19 +62,18 @@ TEST_F(StorageCursorTest, PopulatingTheTable) {
 
 TEST_F(StorageCursorTest, Creation) {
     cursor = table->createCursor();
-    emptyCursor = emptyTable->createCursor();
 
-    EXPECT_THROW(cursor->first(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.first(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->last(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.last(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->next(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.next(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->prev(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.prev(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->current(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.current(), LMDBAL::CursorNotReady);
 
-    cursor->open();
+    cursor.open();
 }
 
 TEST_F(StorageCursorTest, FirstPrivate) {
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -90,14 +85,14 @@ TEST_F(StorageCursorTest, NextPrivate) {
 
     reference++;
     for (; reference != data.end(); ++reference) {
-        std::pair<uint64_t, std::string> element = cursor->next();
+        std::pair<uint64_t, std::string> element = cursor.next();
         EXPECT_EQ(element.first, reference->first);
         EXPECT_EQ(element.second, reference->second);
     }
 
-    EXPECT_THROW(cursor->next(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.next(), LMDBAL::NotFound);
 
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -105,7 +100,7 @@ TEST_F(StorageCursorTest, NextPrivate) {
 }
 
 TEST_F(StorageCursorTest, LastPrivate) {
-    std::pair<uint64_t, std::string> element = cursor->last();
+    std::pair<uint64_t, std::string> element = cursor.last();
     std::map<uint64_t, std::string>::const_reverse_iterator reference = data.rbegin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -117,14 +112,14 @@ TEST_F(StorageCursorTest, PrevPrivate) {
 
     reference++;
     for (; reference != data.rend(); ++reference) {
-        std::pair<uint64_t, std::string> element = cursor->prev();
+        std::pair<uint64_t, std::string> element = cursor.prev();
         EXPECT_EQ(element.first, reference->first);
         EXPECT_EQ(element.second, reference->second);
     }
 
-    EXPECT_THROW(cursor->prev(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.prev(), LMDBAL::NotFound);
 
-    std::pair<uint64_t, std::string> element = cursor->last();
+    std::pair<uint64_t, std::string> element = cursor.last();
     reference = data.rbegin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -132,28 +127,28 @@ TEST_F(StorageCursorTest, PrevPrivate) {
 }
 
 TEST_F(StorageCursorTest, CurrentPrivate) {
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    element = cursor->current();
+    element = cursor.current();
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    cursor->next();
+    cursor.next();
-    element = cursor->current();
+    element = cursor.current();
     ++reference;
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    cursor->next();
+    cursor.next();
-    cursor->next();
+    cursor.next();
-    cursor->prev();
+    cursor.prev();
-    element = cursor->current();
+    element = cursor.current();
     ++reference;
     ++reference;
     --reference;
@@ -163,16 +158,15 @@ TEST_F(StorageCursorTest, CurrentPrivate) {
 }
 
 TEST_F(StorageCursorTest, Destruction) {
-    cursor->close();
+    cursor.close();
 
-    EXPECT_THROW(cursor->first(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.first(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->last(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.last(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->next(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.next(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->prev(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.prev(), LMDBAL::CursorNotReady);
-    EXPECT_THROW(cursor->current(), LMDBAL::CursorNotReady);
+    EXPECT_THROW(cursor.current(), LMDBAL::CursorNotReady);
 
-    EXPECT_THROW(emptyTable->destroyCursor(cursor), LMDBAL::Unknown);
+    cursor = LMDBAL::Cursor<uint64_t, std::string>();
-    table->destroyCursor(cursor);
 
     cursor = table->createCursor();
 }
@@ -180,8 +174,8 @@ TEST_F(StorageCursorTest, Destruction) {
 TEST_F(StorageCursorTest, FirstPublic) {
     transaction = db->beginReadOnlyTransaction();
 
-    cursor->open(transaction);
+    cursor.open(transaction);
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -193,14 +187,14 @@ TEST_F(StorageCursorTest, NextPublic) {
 
     reference++;
     for (; reference != data.end(); ++reference) {
-        std::pair<uint64_t, std::string> element = cursor->next();
+        std::pair<uint64_t, std::string> element = cursor.next();
         EXPECT_EQ(element.first, reference->first);
         EXPECT_EQ(element.second, reference->second);
     }
 
-    EXPECT_THROW(cursor->next(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.next(), LMDBAL::NotFound);
 
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -208,7 +202,7 @@ TEST_F(StorageCursorTest, NextPublic) {
 }
 
 TEST_F(StorageCursorTest, LastPublic) {
-    std::pair<uint64_t, std::string> element = cursor->last();
+    std::pair<uint64_t, std::string> element = cursor.last();
     std::map<uint64_t, std::string>::const_reverse_iterator reference = data.rbegin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -220,14 +214,14 @@ TEST_F(StorageCursorTest, PrevPublic) {
 
     reference++;
     for (; reference != data.rend(); ++reference) {
-        std::pair<uint64_t, std::string> element = cursor->prev();
+        std::pair<uint64_t, std::string> element = cursor.prev();
         EXPECT_EQ(element.first, reference->first);
         EXPECT_EQ(element.second, reference->second);
     }
 
-    EXPECT_THROW(cursor->prev(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.prev(), LMDBAL::NotFound);
 
-    std::pair<uint64_t, std::string> element = cursor->last();
+    std::pair<uint64_t, std::string> element = cursor.last();
     reference = data.rbegin();
 
     EXPECT_EQ(element.first, reference->first);
@@ -235,28 +229,28 @@ TEST_F(StorageCursorTest, PrevPublic) {
 }
 
 TEST_F(StorageCursorTest, CurrentPublic) {
-    std::pair<uint64_t, std::string> element = cursor->first();
+    std::pair<uint64_t, std::string> element = cursor.first();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    element = cursor->current();
+    element = cursor.current();
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    cursor->next();
+    cursor.next();
-    element = cursor->current();
+    element = cursor.current();
     ++reference;
 
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
 
-    cursor->next();
+    cursor.next();
-    cursor->next();
+    cursor.next();
-    cursor->prev();
+    cursor.prev();
-    element = cursor->current();
+    element = cursor.current();
     ++reference;
     ++reference;
     --reference;
@@ -267,37 +261,38 @@ TEST_F(StorageCursorTest, CurrentPublic) {
 
 TEST_F(StorageCursorTest, CornerCases) {
     transaction.terminate();
-    EXPECT_THROW(cursor->current(), LMDBAL::Unknown);
+    EXPECT_THROW(cursor.current(), LMDBAL::Unknown);
-    cursor->close();
+    cursor.close();
 
-    emptyCursor->open();
+    LMDBAL::Cursor<uint64_t, std::string> emptyCursor = emptyTable->createCursor();
-    EXPECT_THROW(emptyCursor->first(), LMDBAL::NotFound);
+    emptyCursor.open();
-    EXPECT_THROW(emptyCursor->last(), LMDBAL::NotFound);
+    EXPECT_THROW(emptyCursor.first(), LMDBAL::NotFound);
-    EXPECT_THROW(emptyCursor->next(), LMDBAL::NotFound);
+    EXPECT_THROW(emptyCursor.last(), LMDBAL::NotFound);
-    EXPECT_THROW(emptyCursor->prev(), LMDBAL::NotFound);
+    EXPECT_THROW(emptyCursor.next(), LMDBAL::NotFound);
-    EXPECT_THROW(emptyCursor->current(), LMDBAL::Unknown);
+    EXPECT_THROW(emptyCursor.prev(), LMDBAL::NotFound);
-    emptyCursor->close();
+    EXPECT_THROW(emptyCursor.current(), LMDBAL::Unknown);
+    emptyCursor.close();
 
-    cursor->open();
+    cursor.open();
-    EXPECT_THROW(cursor->current(), LMDBAL::Unknown);       //yeah, nice thing to write in the doc
+    EXPECT_THROW(cursor.current(), LMDBAL::Unknown);       //yeah, nice thing to write in the doc
 
     std::map<uint64_t, std::string>::const_reverse_iterator breference = data.rbegin();
-    std::pair<uint64_t, std::string> element(cursor->prev());
+    std::pair<uint64_t, std::string> element(cursor.prev());
     EXPECT_EQ(element.first, breference->first);            //nice thing to write in the doc, again!
     EXPECT_EQ(element.second, breference->second);
-    element = cursor->current();
+    element = cursor.current();
     EXPECT_EQ(element.first, breference->first);
     EXPECT_EQ(element.second, breference->second);
-    EXPECT_THROW(cursor->next(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.next(), LMDBAL::NotFound);
-    cursor->close();
+    cursor.close();
 
-    cursor->open();
+    cursor.open();
-    element = cursor->next();
+    element = cursor.next();
     std::map<uint64_t, std::string>::const_iterator reference = data.begin();
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
-    element = cursor->current();
+    element = cursor.current();
     EXPECT_EQ(element.first, reference->first);
     EXPECT_EQ(element.second, reference->second);
-    EXPECT_THROW(cursor->prev(), LMDBAL::NotFound);
+    EXPECT_THROW(cursor.prev(), LMDBAL::NotFound);
 }