update document for CCAutoreleaseData.h

cocos/base/CCData.h

@@ -33,28 +33,58 @@
 
 NS_CC_BEGIN
 
+/**
+ * @lua NA
+ */
 class CC_DLL Data
 {
 public:
+    /**
+     * This parameter is defined for convenient reference if a null Data object is needed.
+     */
     static const Data Null;
     
+    /**
+     * Constructor of Data.
+     */
     Data();
+    
+    /**
+     * Copy constructor of Data.
+     */
     Data(const Data& other);
+    
+    /**
+     * Copy constructor of Data.
+     */
     Data(Data&& other);
+    
+    /**
+     * Destructor of Data.
+     */
     ~Data();
     
-    // Assignment operator
+    /**
+     * Overroads of operator=.
+     */
     Data& operator= (const Data& other);
+    
+    /**
+     * Overroads of operator=.
+     */
     Data& operator= (Data&& other);
     
     /**
-     * @js NA
-     * @lua NA
+     * Gets internal bytes of Data. It will retrun the pointer directly used in Data, so don't delete it.
+     *
+     * @return Pointer of bytes used internal in Data.
      */
     unsigned char* getBytes() const;
+    
     /**
-     * @js NA
-     * @lua NA
+     * Gets the size of the bytes.
+     *
+     * @return The size of bytes of Data.
      */
     ssize_t getSize() const;
     
@@ -74,10 +104,16 @@ public:
      */
     void fastSet(unsigned char* bytes, const ssize_t size);
     
-    /** Clears data, free buffer and reset data size */
+    /** 
+     * Clears data, free buffer and reset data size.
+     */
     void clear();
     
-    /** Check whether the data is null. */
+    /** 
+     * Check whether the data is null.
+     *
+     * @return True if the the Data is null, false if not.
+     */
     bool isNull() const;
     
 private: