returning a pointers content with a method

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So i have class that holds inside a pointer to an object i want to use an acessor to retrive the value for example:

class Example{
private:
Pointing* aPointer;

public:
Example(Pointing* point){
aPointer = point;
}

int acessor(){
return aPointer->exampleMethod();
}


};


when compiling i receive an error anyone have any ideas

Posted 9-Nov-13 7:54am

diego14567

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Christian Graus · Accepted Answer · 2013-11-09T09:20:00

Solution 1

You need to tell us what the error is. We can't read your mind. Then, your acessor (sic) should check first if the pointer is null. But, all of that should compile. I can't see why this would not compile, unless Pointer does not have an 'exampleMethod'.

Posted 9-Nov-13 9:20am

Christian Graus

Comments

diego14567 9-Nov-13 15:24pm

the error says Pointing::exampleMethod missing argument list use &Pointing::exampleMethod to create a pointer to member

Christian Graus 9-Nov-13 15:26pm

So that sounds like the exampleMethod takes arguments, to me. Can you post the code to the Pointing class ?

diego14567 9-Nov-13 15:32pm

so inside pointing there is a method called exampleMethod

int exampleMethod(){
return value;
}

value is just a instance field with a value passed in from the constructor

Pointing(int n){
value = n;
}

Christian Graus 9-Nov-13 15:35pm

Do you have a #include in your Example class so that it knows what Pointing is ?

diego14567 9-Nov-13 15:44pm

yes theres the include from the header file

Christian Graus 9-Nov-13 15:46pm

What compiler ? I just copied your code in to a C++ project and it compiles fine:

#include "Pointing.h"

class Example
{
public:
Example(void);
~Example(void);

private:
Pointing* aPointer;

public:
Example(Pointing* point){
aPointer = point;
}

int acessor(){
return aPointer->exampleMethod();
}

};

and then

class Pointing
{
private:
int value;
public:
Pointing(void);
~Pointing(void);
int exampleMethod(){
return value;
}
};

diego14567 9-Nov-13 15:48pm

vs 12 not sure why that error keeps happening everytime i uncomment that code

Christian Graus 9-Nov-13 16:14pm

Post your pointing class. It's obviously different to mine.

diego14567 9-Nov-13 17:01pm

thanks i was actually missing the parentheses in the acessor