RAII手法封装互斥锁

RAII手法是 Resource Acquisition is Initialization 的缩写，意为“资源获取即初始化”，在使用智能指针时也使用，下面是针对互斥量时的实现，

 1 #include <iostream>
 2 #include <pthread.h>
 3
 4 using namespace std;
 5
 6 class MutexLock
 7 {
 8 public:
 9     MutexLock()
10     {
11         pthread_mutex_init(&mutex_, NULL);
12     }
13
14     ~MutexLock()
15     {
16         pthread_mutex_destroy(&mutex_);
17     }
18
19     void Lock()
20     {
21         pthread_mutex_lock(&mutex_);
22     }
23
24     void Unlock()
25     {
26         pthread_mutex_unlock(&mutex_);
27     }
28
29 private:
30     MutexLock(const MutexLock&);
31     MutexLock& operator=(const MutexLock&);
32     pthread_mutex_t mutex_;
33 };
34
35 class MutexLockGuard
36 {
37 public:
38     explicit MutexLockGuard(MutexLock& mutex): mutex_(mutex)
39     {
40         mutex_.Lock();
41     }
42
43     ~MutexLockGuard()
44     {
45         mutex_.Unlock();
46     }
47
48 private:
49     MutexLockGuard(const MutexLockGuard&);
50     MutexLockGuard& operator=(const MutexLockGuard&);
51
52     MutexLock& mutex_;
53 };
54
55 class Foo
56 {
57 public:
58     void print()
59     {
60         MutexLockGuard lock(mutex_);
61         cout << "Hello" << endl;
62     }
63
64 private:
65     MutexLock mutex_;
66 };