Fix warnings from -Weffc++

implementations/onblocks/parallelaccessdatatreestore/DataTreeRef.h

@@ -40,8 +40,12 @@ public:
   void flush() {
     return _baseTree->flush();
   }
+
 private:
+
   datatreestore::DataTree *_baseTree;
+
+  DISALLOW_COPY_AND_ASSIGN(DataTreeRef);
 };
 
 }

test/implementations/onblocks/datanodestore/DataInnerNodeTest.cpp

@@ -106,6 +106,10 @@ public:
   Data ZEROES;
   unique_ref<DataLeafNode> leaf;
   unique_ref<DataInnerNode> node;
+
+private:
+
+  DISALLOW_COPY_AND_ASSIGN(DataInnerNodeTest);
 };
 
 constexpr uint32_t DataInnerNodeTest::BLOCKSIZE_BYTES;

test/implementations/onblocks/datanodestore/DataLeafNodeTest.cpp

@@ -112,6 +112,9 @@ public:
   Data ZEROES;
   Data randomData;
   unique_ref<DataLeafNode> leaf;
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(DataLeafNodeTest);
 };
 
 constexpr uint32_t DataLeafNodeTest::BLOCKSIZE_BYTES;

test/implementations/onblocks/datatreestore/DataTreeTest_TraverseLeaves.cpp

@@ -22,6 +22,8 @@ MATCHER_P(KeyEq, expected, "node key equals") {
 
 class DataTreeTest_TraverseLeaves: public DataTreeTest {
 public:
+  DataTreeTest_TraverseLeaves() :traversor() {}
+
   unique_ref<DataInnerNode> CreateThreeLevel() {
     return CreateInner({
       CreateFullTwoLevel(),

test/implementations/onblocks/datatreestore/testutils/DataTreeTest.h

@@ -55,6 +55,9 @@ public:
   void EXPECT_IS_FULL_THREELEVEL_TREE(const blockstore::Key &key);
 
   void CHECK_DEPTH(int depth, const blockstore::Key &key);
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(DataTreeTest);
 };