Does a class occupy memory..where is member function stored.

Question

why is output 1 for
class a{};
int main()
{ a o;
cout<<sizeof(o); }

Answer 1

Yes but no.
It allocates space in the Stack (where your program is stored, your functions and so on) but not on the Heap (where pointers are stored)

Answer 2

Normal member functions are stored in the .text section of your program. They do not take up extra memory per each instance, because a member function takes in a pointer to the class instance, rather than creating a whole new function for each instance. Declaring the class but not creating an instance does make the .text section slightly bigger (unless the compiler sees that you don't do anything with it and throws it out), so yes it does use up some memory when declaring a class. However, this memory will most likely already be allocated and have extra space. So overall you most likely won't be taking up anymore total memory with the declaration of the class.

Answer 3

The output is 1 as the class contains nothing but still exist

Answer 4

so does declaring class allocate space in memory?

Answer 5

but y is the output 1 why not any other or is it Machine dependent?

Answer 6

1 is the number of byte o take in memory

Answer 7

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