I am having a problem with the use of a class member that does not seem to be constructed.

I have a name space called "DogActivity".

In this name space there are two classes " DogSounds and Bark".

In the Bark class I have a private: instance of DogSounds.

Now in the constructor of the DogSounds class there is a private: int variable called NumSounds that is initialized to 0.

The problem is if i create an instance of DogSound in my main program the constructor is called and the NumSounds variable is set to 0 as planned.

But

If i create an instance of Bark in the main program the constructor of DogSounds is never called and NumSounds is never initialized.

here is an example of my namespace with classes.

namespace DogActivity
{

    class DogSounds
    {
            public:
             DogSounds() { NumSonds = 0;}

            private:
               int NumSounds;
     };

     class Bark{

       private:
            DogSounds dogSounds;

     };

}

Now here is how i would use in main

using namespace DogActivity;

int main ( int argc, char * argv[] ) 
{

Bark bark;

// Do work with bark bellow

}

But when I create the instance of Bark the privat: dogSounds' variable "NumSounds" is never set to 0. The Constructor of dogSounds is never called, why is this? shouldn't the constructor of dogSounds be called as soon as i create an instance of Bark? what might i be doing wrong here?

The member variable of DogSounds:

• is Not a pointer.
  • Only pointer should be assign to NULL or since C++11 to nullptr.
• NULL is not a Number.
  • in C NULL is just a #define for this: ((void*)0)
  • in C++ can it be just a Zero but don't have to be from what i learned.
• Here an link what NULL represent: http://www.cplusplus.com/reference/cstring/NULL/

Your code is also a bit wrong!!

Bark has a member Variable of type DogSounds!

but you never use this member. Instead you try to access NumSounds

which was never declared in the class Bark.

to access NumSounds from dogsounds you would need to do this:

dogSounds.NumSounds

but even that is not possible because you set NumSounds in the class DogSounds private so it can never be accessed from the Outside. What you need to do is to write setter and getter for DogSounds to manipulate his member.

Wait your right im sorry the null should be 0. but this does not change the fact that the constructor is not being called.

I have edited it so it will be just as basic as it could possibly be. What I am asking is, with the example shown above, Would the constructor of DogSounds be called if an instance of Bark was created?

I mean 2 classes in a names space.

class A and class B

class B has a private: instance of class A.

Assuming that the namespace is being used properly, Would the constructor of class A be called when an instance is created of class B?

no i did not paste the code. its just pseudo coded that i made to elaborate. I am sorry i should have made note of that.

this is what i am actually actually asking

2 classes in a names space.

class A and class B

class B has a private: instance of class A.

Assuming that the namespace is being used properly, Would the constructor of class A be called when an instance is created of class B?

Thank you guys for the help and I do appreciate your being able to look past my wack psuedo-code. but thats all i needed to know. the constructor should be called :)