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Tip of the Day
Language: C++
Expertise: Intermediate
Sep 5, 2000

The Memory Layout of Members with Different Access Specifiers

Consider the following two classes:

 
class A
{
private:
  int n;
public:
  int m;
};

class B
{
private:
  int n;
  int m;
};

Theoretically, the memory layout of these two classes may be different because A has different access types for each member. The C++ Standard allows an implementation to store such members in non-adjacent memory addresses. However, in practice, I'm not aware of any compiler that does so. Under all existing compilers, the memory layout of the two classes is identical.

Danny Kalev
 
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