boost shared_ptr 基类转到子类 boost::dynamic_pointer_cast

#include "boost/shared_ptr.hpp"

class Base
{
public:

Base(){};
virtual ~Base(){};
};

class DeriveClass : public Base
{
public:

DeriveClass():Base(){};
virtual ~DeriveClass(){};
};

int main(int argc, _TCHAR* argv[])
{
boost::shared_ptr<Base> ptrBase = boost::shared_ptr<DeriveClass>(new DeriveClass()); // 这样转换成功
// 下面出现编译错误
boost::shared_ptr<DeriveClass> ptrDerive = dynamic_cast<boost::shared_ptr<DeriveClass> >(ptrBase);
// 下面正确
boost::shared_ptr<DeriveClass> ptrDerive = boost::dynamic_pointer_cast<DeriveClass>(ptrBase);
return 0;
}