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:
#include <iostream>
#include <pthread.h>
using namespace std;
class MutexLock
{
public:
MutexLock()
{
pthread_mutex_init(&mutex_, NULL);
}
~MutexLock()
{
pthread_mutex_destroy(&mutex_);
}
void Lock()
{
pthread_mutex_lock(&mutex_);
}
void Unlock()
{
pthread_mutex_unlock(&mutex_);
}
private:
MutexLock(const MutexLock&);
MutexLock& operator=(const MutexLock&);
pthread_mutex_t mutex_;
};
class MutexLockGuard
{
public:
explicit MutexLockGuard(MutexLock& mutex): mutex_(mutex)
{
mutex_.Lock();
}
~MutexLockGuard()
{
mutex_.Unlock();
}
private:
MutexLockGuard(const MutexLockGuard&);
MutexLockGuard& operator=(const MutexLockGuard&);
MutexLock& mutex_;
};
class Foo
{
public:
void print()
{
MutexLockGuard lock(mutex_);
cout << "Hello" << endl;
}
private:
MutexLock mutex_;
};
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