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  1.     #include <stdio.h>
  2.     class Base{
  3.     public:
  4.         virtual void vfunc() { puts("Base::vfunc()"); }
  5.     };
  6.     class Derived: public Base
  7.     {
  8.     public:
  9.         virtual void vfunc() { puts("Derived::vfunc()"); }
  10.     };
  11.     #include <string.h>
  12.  
  13.     int main()
  14.     {
  15.         Derived d;
  16.         Base b_assign = d;
  17.         Base b_memcpy;
  18.         memcpy(&b_memcpy, &d, sizeof(Base));
  19.  
  20.         b_assign.vfunc();
  21.         b_memcpy.vfunc();
  22.  
  23.         printf("sizeof Base : %d\n", sizeof(Base));
  24.  
  25.         Base &b_ref = d;
  26.         b_ref.vfunc();
  27.  
  28.         printf("b_assign: %x; b_memcpy: %x; b_ref: %x\n", 
  29.             *(int *)&b_assign,
  30.             *(int *)&b_memcpy,
  31.             *(int *)&b_ref);
  32.         return 0;
  33.     }
  34.  
Success #stdin #stdout 0s 3468KB
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stdin
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Standard input is empty
stdout
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Base::vfunc()
Base::vfunc()
sizeof Base : 4
Derived::vfunc()
b_assign: 80487b4; b_memcpy: 8048780; b_ref: 8048780
https://ideone.com/uWZF2t
language:
C++14 (clang 8.0)
created:
7 years ago
visibility:
secret

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