Just want to double check that the default (implicitly defined by compiler) copy constructor for C++ classes performs the copy constructor on each member variable as well using the old value to get the copied value for each member and for atomic objects just uses a bit copy (e.g. ints and floats)
Does the implicitly defined copy constructor in C++ call copy constructor for members too right?
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Yes. The default copy constructor in C++ will be member-wise copy initialization for every member in the type.
As to how exactly the copy is done for primitive types such as int and float I cannot say for certain. My guess is it's implementation specific but most compilers just do a bit by bit copy.
Yes, that is exactly what it does.