错误C2248：'std :: unique_ptr< _Ty> :: unique_ptr'：无法访问在'std :: unique_ptr< _Ty> [英] error C2248: 'std::unique_ptr<_Ty>::unique_ptr' : cannot access private member declared in class 'std::unique_ptr<_Ty>'

问题描述

目前我尝试使用std :: unique_ptr，但在visual studio 2012中遇到编译器错误。

Currently I am trying to use a std::unique_ptr, but getting compiler error in visual studio 2012.

class A
{
private:
 unique_ptr<A> other;
public:
 unique_ptr<A> getOther()
 {
   return other;
 }
};

而错误是：

> error C2248: 'std::unique_ptr<_Ty>::unique_ptr' : cannot access private member declared in class 'std::unique_ptr<_Ty>'
1>          with
1>          [
1>              _Ty=A
1>          ]
1>          c:\program files (x86)\microsoft visual studio 11.0\vc\include\memory(1447) : see declaration of 'std::unique_ptr<_Ty>::unique_ptr'
1>          with
1>          [
1>              _Ty=A
1>          ]

推荐答案

我相信unique_ptr可以是返回类型，如果返回的值是局部范围的（即，一旦它出来的函数就被销毁）....在你的case它的不，因为ur返回unique_ptr<>其他，有生命时间，直到类有效。

I believe unique_ptr can be return type, if the value that is returned is of local scope.(i.e, it gets destroyed as soon as it gets out of the function) .... in your case its not, since u r returning unique_ptr <> other, which has life time till the class is valid.

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