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  1.     #include <iostream>
  2.  
  3.     class Base {
  4.     public:
  5.       char const* address() const { return (char const*)dynamic_cast<void const*>(this); } // uses RTTI
  6.       size_t offset() const { return this->address() - (char const*)this; }
  7.       virtual size_t size() const { return sizeof(Base); } // to be overriden
  8.  
  9.     };
  10.  
  11.     class Derived: public Base {
  12.     public:
  13.       virtual size_t size() const { return sizeof(Derived); } // to be overriden
  14.     private:
  15.       int a;
  16.       int b;
  17.     };
  18.  
  19.     int main() {
  20.       Base base;
  21.       Derived derived;
  22.  
  23.       std::cout << (void*)&base << ": " << (void*)base.address() << ", " << base.offset() << ", " << base.size() << "\n";
  24.  
  25.       std::cout << (void*)&derived << ": " << (void*)derived.address() << ", " << derived.offset() << ", " << derived.size() << "\n";
  26.     }
Success #stdin #stdout 0.01s 2724KB
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Standard input is empty
stdout
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0xbffa28e8: 0xbffa28e8, 0, 4
0xbffa28dc: 0xbffa28dc, 0, 12
https://ideone.com/eqYiZ
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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