class member is another class' object

Question

I am a new C++ user...

I have a question regarding how to declare a member of a class \"classA\" that is an object of another class \"classB\", knowing that \"classB\" h

Answer 1

If you want a VideoCapture to be a member of the class, you don't want this in your class definition:

VideoCapture myCapture (string videoFileName /* :  I am not sur what to put here */ )  ;

Instead you want this:

VideoCapture myCapture;

Then, your constructor can do this:

myClass::myClass (string PLEASE_GIVE_ME_A_BETTER_NAME)
: myCapture(PLEASE_GIVE_ME_A_BETTER_NAME),
videoFileName(PLEASE_GIVE_ME_A_BETTER_NAME)
{
}

Answer 2

What you need is initializer list:

myClass::myClass (string videoFileName) : myCapture(videoFileName) {
}

This will construct myCapture using its constructor that takes a string argument.