Can I use memcpy in C++ to copy classes that have no pointers or virtual functions

Question

Say I have a class, something like the following;

class MyClass
{
public:
  MyClass();
  int a,b,c;
  double x,y,z;
};

#define  PageSize 1000000

MyClass Ar         


        

Answer 1

Calling memcpy on non-POD classes is undefined behaviour. I suggest to follow Kirill's tip for assertion. Using memcpy can be faster, but if the copy operation is not performance critical in your code then just use bitwise copy.