c++ - std::vector - 错误:无法删除不是指针的对象

Question

也许有人可以帮助我理解错误。

我写这段代码:

class Text
{
private:
    struct paragraph
    {
        vector<string> lines;       
    };

    vector<shared_ptr<paragraph>> paragraphs; 
public:

    Text()
    {
        paragraphs.push_back(shared_ptr<paragraph>(new paragraph()));
    }
};

int main()
{
    shared_ptr<Text> pText(nullptr);
    Text text();
    pText.reset(&text);
    return 0;
}

当我尝试运行它时
我收到此错误:

    1>c:\program files\microsoft visual studio 10.0\vc\include\memory(1664): error C2541: 'delete' : cannot delete objects that are not pointers
1>          c:\program files\microsoft visual studio 10.0\vc\include\memory(1431) : see reference to function template instantiation 'void std::tr1::shared_ptr<_Ty>::_Resetp<_Ux>(_Ux (__cdecl *))' being compiled
1>          with
1>          [
1>              _Ty=Text,
1>              _Ux=Text (void)
1>          ]
1>          c:\program files\microsoft visual studio 10.0\vc\include\memory(1607) : see reference to function template instantiation 'std::tr1::shared_ptr<_Ty>::shared_ptr<_Ux>(_Ux (__cdecl *))' being compiled
1>          with
1>          [
1>              _Ty=Text,
1>              _Ux=Text (void)
1>          ]
1>          c:\documents and settings\owner\שולחן העבודה\e\class.cpp(29) : see reference to function template instantiation 'void std::tr1::shared_ptr<_Ty>::reset<Text(void)>(_Ux (__cdecl *))' being compiled
1>          with
1>          [
1>              _Ty=Text,
1>              _Ux=Text (void)
1>          ]

“不能删除不是指针的对象”是什么意思？
我不是要删除任何对象。

Answer 1

除了最令人烦恼的解析之外，您的代码还包含一个基本缺陷:

您不得将指向堆栈分配对象的指针分配给 shared_ptr。

此代码将导致未定义的行为，这在实践中意味着很多痛苦:

shared_ptr<Text> pText(nullptr);
Text text;
pText.reset(&text);

shared_ptr 将在其生命周期结束时尝试delete &text。