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template<class _Ty>
class auto_ptr
{ // wrap an object pointer to ensure destruction
public:
typedef _Ty element_type;
explicit auto_ptr(_Ty *_Ptr = 0) _THROW0()
: _Myptr(_Ptr)
{ // construct from object pointer
}
auto_ptr(auto_ptr<_Ty>& _Right) _THROW0()
: _Myptr(_Right.release())
{ // construct by assuming pointer from _Right auto_ptr
}
auto_ptr(auto_ptr_ref<_Ty> _Right) _THROW0()
: _Myptr(_Right._Ref.release())
{ // construct by assuming pointer from _Right auto_ptr_ref
}
//?????????????????????????????????????????????????????????????????????????
//此处class_other是何解,好奇怪的语法,貌似是个构造函数。求解此处的详细剖析。
//模板类里面再次出现模板用处,还有operator 一个类型不明白
//??????????????????????????????????????????????????????????????????????????
template<class _Other>
operator auto_ptr<_Other>() _THROW0()
{ // convert to compatible auto_ptr
return (auto_ptr<_Other>(*this));
}
template<class _Other>
operator auto_ptr_ref<_Other>() _THROW0()
{ // convert to compatible auto_ptr_ref
return (auto_ptr_ref<_Other>(*this));
}
template<class _Other>
auto_ptr<_Ty>& operator=(auto_ptr<_Other>& _Right) _THROW0()
{ // assign compatible _Right (assume pointer)
reset(_Right.release());
return (*this);
}
template<class _Other>
auto_ptr(auto_ptr<_Other>& _Right) _THROW0()
: _Myptr(_Right.release())
{ // construct by assuming pointer from _Right
}
auto_ptr<_Ty>& operator=(auto_ptr<_Ty>& _Right) _THROW0()
{ // assign compatible _Right (assume pointer)
reset(_Right.release());
return (*this);
}
auto_ptr<_Ty>& operator=(auto_ptr_ref<_Ty>& _Right) _THROW0()
{ // assign compatible _Right._Ref (assume pointer)
reset(_Right._Ref.release());
return (*this);
}
~auto_ptr()
{ // destroy the object
delete _Myptr;
}
_Ty& operator*() const _THROW0()
{ // return designated value
return (*_Myptr);
}
_Ty *operator->() const _THROW0()
{ // return pointer to class object
return (&**this);
}
_Ty *get() const _THROW0()
{ // return wrapped pointer
return (_Myptr);
}
_Ty *release() _THROW0()
{ // return wrapped pointer and give up ownership
_Ty *_Tmp = _Myptr;
_Myptr = 0;
return (_Tmp);
}
void reset(_Ty* _Ptr = 0)
{ // destroy designated object and store new pointer
if (_Ptr != _Myptr)
delete _Myptr;
_Myptr = _Ptr;
}
private:
_Ty *_Myptr; // the wrapped object pointer
};
#include "stdafx.h"
#include <iostream>
using namespace std;
class Test
{
public:
Test()
{
a=1;
}
operator int()const
{
return a;
}
private:
int a;
};
int _tmain(int argc, _TCHAR* argv[])
{
int b=3;
Test test;
cout<<test*b<<endl;
system("pause");
return 0;
}
/**
* @brief Automatic conversions
*
* These operations convert an %auto_ptr into and from an auto_ptr_ref
* automatically as needed. This allows constructs such as
* @code
* auto_ptr<Derived> func_returning_auto_ptr(.....);
* ...
* auto_ptr<Base> ptr = func_returning_auto_ptr(.....);
* @endcode
*/
auto_ptr(auto_ptr_ref<element_type> __ref) throw()
: _M_ptr(__ref._M_ptr) { }