diff --git a/include/mutex.h b/include/mutex.h
index 2418974..cedfd85 100644
--- a/include/mutex.h
+++ b/include/mutex.h
@@ -12,6 +12,7 @@
 #include <pthread.h>
 #include <string.h>
 #include <sys/time.h>
+#include <boost/noncopyable.hpp>
 #include "timer.h"
 
 namespace baidu {
@@ -27,7 +28,7 @@ static void PthreadCall(const char* label, int result) {
 }
 
 // A Mutex represents an exclusive lock.
-class Mutex {
+class Mutex : boost::noncopyable {
 public:
     Mutex()
         : owner_(0), msg_(NULL), msg_threshold_(0), lock_time_(0) {
@@ -94,8 +95,6 @@ class Mutex {
     }
 private:
     friend class CondVar;
-    Mutex(const Mutex&);
-    void operator=(const Mutex&);
     pthread_mutex_t mu_;
     pthread_t owner_;
     const char* msg_;
@@ -104,7 +103,7 @@ class Mutex {
 };
 
 // Mutex lock guard
-class MutexLock {
+class MutexLock : boost::noncopyable {
 public:
     explicit MutexLock(Mutex *mu, const char* msg = NULL, int64_t msg_threshold = 5000)
       : mu_(mu) {
@@ -115,12 +114,10 @@ class MutexLock {
     }
 private:
     Mutex *const mu_;
-    MutexLock(const MutexLock&);
-    void operator=(const MutexLock&);
 };
 
 // Conditional variable
-class CondVar {
+class CondVar : boost::noncopyable {
 public:
     explicit CondVar(Mutex* mu) : mu_(mu) {
         PthreadCall("init condvar", pthread_cond_init(&cond_, NULL));
@@ -155,8 +152,6 @@ class CondVar {
         PthreadCall("broadcast", pthread_cond_broadcast(&cond_));
     }
 private:
-    CondVar(const CondVar&);
-    void operator=(const CondVar&);
     Mutex* mu_;
     pthread_cond_t cond_;
 };
diff --git a/include/sliding_window.h b/include/sliding_window.h
index f5dc8a4..2c1ddd2 100644
--- a/include/sliding_window.h
+++ b/include/sliding_window.h
@@ -11,6 +11,7 @@
 #include <vector>
 #include <map>
 #include <boost/function.hpp>
+#include <boost/noncopyable.hpp>
 
 #include "mutex.h"
 
@@ -18,17 +19,14 @@ namespace baidu {
 namespace common {
 
 template <typename Item>
-class SlidingWindow {
+class SlidingWindow : boost::noncopyable {
 public:
     typedef boost::function<void (int32_t, Item)> SlidingCallback;
     SlidingWindow(int32_t size, SlidingCallback callback)
-      : bitmap_(NULL), items_(NULL), item_count_(0),
-        callback_(callback), size_(size),
+      : bitmap_(new char[size]), items_(new Item[size]), 
+        item_count_(0), callback_(callback), size_(size),
         base_offset_(0), max_offset_(-1), ready_(0), notifying_(false) {
-        bitmap_ = new char[size];
         memset(bitmap_, 0, size);
-        items_ = new Item[size];
-        size_ = size;
     }
     ~SlidingWindow() {
         delete[] bitmap_;
diff --git a/include/thread.h b/include/thread.h
index 17ecb5c..bfeaea4 100644
--- a/include/thread.h
+++ b/include/thread.h
@@ -11,11 +11,12 @@
 #include <string.h>
 
 #include <boost/function.hpp>
+#include <boost/noncopyable.hpp>
 
 namespace baidu {
 namespace common {
 
-class Thread {
+class Thread : boost::noncopyable {
 public:
     Thread() {
         memset(&tid_, 0, sizeof(tid_));
@@ -35,8 +36,6 @@ class Thread {
         return (ret == 0);
     }
 private:
-    Thread(const Thread&);
-    void operator=(const Thread&);
     static void* ProcWrapper(void* arg) {
         reinterpret_cast<Thread*>(arg)->user_proc_();
         return NULL;
diff --git a/include/thread_pool.h b/include/thread_pool.h
index d060d3b..8be7145 100644
--- a/include/thread_pool.h
+++ b/include/thread_pool.h
@@ -13,6 +13,7 @@
 #include <sstream>
 #include <vector>
 #include <boost/function.hpp>
+#include <boost/noncopyable.hpp>
 #include "mutex.h"
 #include "timer.h"
 
@@ -22,7 +23,7 @@ namespace common {
 static const int kDebugCheckTime = 5000;
 
 // An unscalable thread pool implimention.
-class ThreadPool {
+class ThreadPool :boost::noncopyable {
 public:
     ThreadPool(int thread_num = 10)
         : threads_num_(thread_num),
@@ -173,9 +174,6 @@ class ThreadPool {
     }
 
 private:
-    ThreadPool(const ThreadPool&);
-    void operator=(const ThreadPool&);
-
     static void* ThreadWrapper(void* arg) {
         reinterpret_cast<ThreadPool*>(arg)->ThreadProc();
         return NULL;
diff --git a/include/util.h b/include/util.h
index a5ca282..add2648 100644
--- a/include/util.h
+++ b/include/util.h
@@ -23,8 +23,7 @@ static inline std::string GetLocalHostName() {
     if (0 != gethostname(str, kMaxHostNameSize + 1)) {
         return "";
     }
-    std::string hostname(str);
-    return hostname;
+    return std::string(str);
 }
 
 static const uint32_t MAX_PATH_LENGHT = 10240;