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  1. #include <cstring>
  2.  
  3. #include <iostream>
  4.  
  5. struct base_t {
  6.     unsigned a;
  7. };
  8.  
  9. struct derived_t : base_t {
  10.     unsigned a;
  11. };
  12.  
  13. void print_derived_info(const derived_t& d) {
  14.     std::cout << "base_t::a = " << ((const base_t&)d).a << ", "
  15.               << "derived_t::a = " << d.a << std::endl;
  16. }
  17.  
  18. int main() {
  19.     derived_t d;
  20.  
  21.     memset(&d, 0u, sizeof(d));
  22.     print_derived_info(d);
  23.  
  24.     d.a = 3;
  25.     print_derived_info(d);
  26.  
  27.     d.base_t::a = 4;
  28.     print_derived_info(d);
  29. }
Success #stdin #stdout 0s 3340KB
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stdin
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Standard input is empty
stdout
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base_t::a = 0, derived_t::a = 0
base_t::a = 0, derived_t::a = 3
base_t::a = 4, derived_t::a = 3
https://ideone.com/OQDz9i
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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