Added MStorage::merge function

MStorage.cpp

@@ -350,6 +350,16 @@ void MStorage::setGroup(const std::string &key, MStorage *group) {
     insertRaw(key, group);
 }
 
+void MStorage::merge(MStorage *group, bool replaceValues) {
+    MValueMapIterator it = group->begin();
+    while(it != group->end()) {
+        if(replaceValues || !containsKey(it->first)) {
+            insertRaw(it->first, it->second);
+        }
+        it++;
+    }
+}
+
 int32_t MStorage::getInt(const std::string &key) {
     IMStorageBasicType *bval = getBasicType(key);
     return bval ? bval->getInt() : 0;

MStorage.h

@@ -147,6 +147,7 @@ public:
     void setByte(const std::string &key, uint8_t val);
     void setString(const std::string &key, std::string val);
     void setGroup(const std::string &key, MStorage *group);
+    void merge(MStorage *group, bool replaceValues);
 
     int32_t getInt(const std::string &key);
     int32_t* getIntArray(const std::string &key, uint16_t *len);

example/example.cpp

@@ -40,6 +40,11 @@ int main(int argc, char const *argv[]) {
         int32_t _ints[] = {42, 34, 32323, 5573453};
         group->setIntArray("someIntArray", _ints, 4); // array is being copied
 
+    MStorage *groupToMerge = new MStorage();
+        groupToMerge->setDouble("someDouble2", 1.23);
+
+    group->merge(groupToMerge, false);
+
     storage->setGroup("someGroup", group);
 
     print_fieds(storage);