c++常用设计模式实现

单例模式：

#pragma  once

#include <iostream>

class IncrementalDBLoader {
public:
static IncrementalDBLoader& instance(){
static IncrementalDBLoader s_g_loader ;
return s_g_loader;
}

private:
IncrementalDBLoader(){}                            // Constructor
IncrementalDBLoader(IncrementalDBLoader const&);          // Don't Implement
void operator=(IncrementalDBLoader const&);        // Don't implement

private:

};