my_simple_RAII

//class Resource {//public://    Resource(parms p): r(allocate(p)) { }//    ~Resource() { release(r); }//    // also need to define copy and assignment//private://    resource_type *r;           // resource managed by this type//    resource_type *allocate(parms p);     // allocate this resource//    void release(resource_type*);         // free this resource//};//void fcn()//{//    Resource res(args);   // allocates resource_type//    // code that might throw an exception//    // if exception occurs, destructor for res is run automatically//    // ...//}  // res goes out of scope and is destroyed automatically#include <exception>#include <iostream>#include "Windows.h"class Resource {public:    // 不用allocate这个函数时，可以使用这个构造函数也是一样的    //Resource(int const & number) : r(new int [number]())    //{     //    std::cout << "allocate 4k bytes" << std::endl;    //}    Resource(int const & number) : r(allocate(number)) { }    ~Resource() { release(r); }private:    int* allocate(const int & number) const // 程序员我认为这个函数可能抛出任何异常    {         std::cout << "allocate 4k bytes " << std::endl;        return new int[number]();           // 小括号表示初始化为0，在linux下这句话也是编不过的，必须把小括号拿掉    }    void release(int* pRes) const throw()   // 程序员我认为这个函数不抛出任何异常    {         std::cout << "free 4k bytes " << std::endl;        delete pRes;     }     int* r;};void fcn() throw() // 程序员认为不抛出任何异常{    Sleep(1000);    Resource const res(1024);}void fcn2() throw(std::exception) // 程序员认为这个函数可能抛出std::exception类型或者其派生类类型的异常{    Sleep(1000);    Resource const res(1000);    throw std::exception("a! yi chang le!!!");}int main(){    //while(true) // 用来验证我的RAII是不是好用，一是注释析构中的release，然后取消注释，通过任务管理器能看的很清楚    //{    //    fcn();    //}    // 把上面注释起来，下面用来看出异常时，能否有效    while(true)    {        try        {            fcn2();        }        catch(std::exception const & e)        {            std::cout << e.what() << std::endl;        }    }    return 0;}

// code: http://download.csdn.net/detail/sunyongjie1983/3822148