#include <iostream>
    #include <cstring>
 
    using namespace std;
 
    const volatile int v1 = 0;
    volatile unsigned v2 = 0;
 
    void Fxn1()
    {
      if (v1) { v2 = 0x12345601; }
      cout << "Fxn1" << endl;
    }
 
    void Fxn2()
    {
      if (v1) { v2 = 0x12345602; }
      cout << "Fxn2" << endl;
    }
 
    int FindFxnConst(void(*f)())
    {
      const unsigned char* p = (const unsigned char*)f;
      while (memcmp(p, "\x56\x34\x12", 3))
        p++;
      return p[-1];
    }
 
    int main()
    {
      Fxn1();
      cout << FindFxnConst(Fxn1) << endl;
      Fxn2();
      cout << FindFxnConst(Fxn2) << endl;
      return 0;
    }
 

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