在构造函数错误中将类指针作为参数传递

Question

my_world.hpp

Class my_world :: public I_my_world
{  
 public:    
   my_world(hello_world* dev);  
   virtual ~my_world() {};  
   virtual int trees();  
private:  
   hello_world* const p_dev;    
}

I_my_world.hpp

Class I_my_world  
{  
public:  
   virtual int trees() = 0;  
protected:  
   virtual ~I_my_world() {};  
}

I_hello_world.hpp

Class I_hello_world  
{  
public:  
   virtual void plant() = 0;  
protected:  
   virtual ~I_hello_world() {};  
}

hello_world.hpp

Class hello_world : public I_hello_world  
{ 
public:   
   hello_world() = default;  
   virtual ~hello_world() = default;  
   virtual void plant() {};  
}

my_world.cpp

int my_world::trees()  
{  
   p_dev->plant();  
   return 0;  
}

my_world::my_world(hello_world* dev)  
: p_dev(nullptr)  
{  
    
}  

new_world.cpp -> inside main

hello_world * alpha = new hello_world();
my_world * beta = new my_world(alpha);
int b = beta ->trees();

Am I doing anything wrong here? My processor gives shell thread error. I just have this much code so its error is not dependent on any other code.

I want to know if I am doing anything wrong code wise, if it is anything related to the processor, I can check other things.

Answer 1

This code certainly looks curious

my_world::my_world(hello_world* dev) : p_dev(nullptr) 

That should be

my_world::my_world(hello_world* dev) : p_dev(dev)

Because p_dev is null, you get a crash here

int my_world::trees()
{
   p_dev->plant();
   return 0;
}