标签：des blog http 使用 os io for ar
智能指针的学习
中文教程网站 http://zh.highscore.de/cpp/boost/
不过代码可能 由于BOOST 版本不同需要稍作修改
scoped_ptr 离开作用域则自动调用类析构函数或者函数delete方法
shared_ptr 使用率最高的指针 类似scoped_ptr 但是所有权可以转移
#include <iostream>
#include <vector>
#include <windows.h>
#include <boost/smart_ptr.hpp>
using namespace std;
class CHandle
{
HANDLE hProcess;
public:
CHandle() { hProcess = OpenProcess(PROCESS_SET_INFORMATION, FALSE, GetCurrentProcessId()); }
~CHandle() { cout << "Enter destructor handle" << endl; if(NULL != hProcess){CloseHandle(hProcess);hProcess = NULL;} }
void PrintHandle() {cout << hProcess << endl;}
};
int _tmain(int argc, _TCHAR* argv[])
{
{
boost::scoped_ptr<CHandle> sp(new CHandle);
sp->PrintHandle();
sp.reset(new (CHandle));
sp->PrintHandle();
}
cout << endl;
typedef boost::shared_ptr<int> SHP;
vector<SHP> v;
v.push_back(SHP (new int(1)));
v.push_back(SHP (new int(2)));
v.push_back(SHP (new int(3)));
for(vector<SHP>::iterator it = v.begin();
it != v.end();++it)
{
cout << *(*it) << endl;
}
cout << endl;
boost::shared_ptr<int> i1(new int(99));
boost::shared_ptr<int> i2(i1);
cout << *i1 << endl;
cout << *i2 << endl;
i1.reset(new int(5));
cout << *i1 << endl;
cout << *i2 << endl;
return 0;
}
再来一个示例
智能指针创建空间 保存输入的字符串
int _tmain(int argc, _TCHAR* argv[])
{
char sz[] = "this is test string";
int strLen = strlen(sz) + 1;
typedef boost::shared_ptr<char> SHPCHAR;
SHPCHAR szp(new char[strLen]);
strncpy(szp.get(),sz,strLen);
cout << szp.get() <<endl;
return 0;
}
标签：des blog http 使用 os io for ar
原文地址：http://www.cnblogs.com/itdef/p/3905269.html
