Boost共享指针初始化 [英] Boost shared pointer initialization

问题描述

我是C ++的初学者。我有以下问题。在MevisPatientModel类中定义：

I am pretty a beginner in C++. I have following problem. In the class MevisPatientModel I defined:

typedef boost::shared_ptr<egMevisPatientModel> Ptr_t;

Then I "defined" the variable:

egMevisPatientModel::Ptr_t v_PatientModel;

现在，当我尝试访问MevisPatientModel类的getType函数时：

Now when I try to access the getType function of the class MevisPatientModel :

v_PatientModel->getType()

...我收到以下讯息：

...I'm getting following message:

声明失败！ ... shared_ptr.hpp表达式px！= 0

Assertion failed! ...shared_ptr.hpp Expression px!= 0

我的意图是指针未初始化。现在我知道，这里有很多答案，适合我的问题。但正如我所说，我是一个初学者。说实话我不是这些答案明白。请帮助我，给我一个明确和具体的答案我的问题。非常感谢。

My intention is that the pointer wasn't initialized. Now I know that here are many answers which would "fit" to my question. But as I said, I am a beginner. To be honest I don't these answers understand. Please help me and give me a clear and specific answer to my problem. Thank you very much.

Greets，Marco

Greets, Marco

推荐答案

使用 new 创建动态对象，并将生成的指针分配给 shared_ptr ：

You need to create an dynamic object with new and assign the resulting pointer into the shared_ptr:

egMevisPatientModel::Ptr_t v_PatientModel(
    std::make_shared<egMevisPatientModel>());

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