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  1. #include <iostream>
  2.  
  3. struct foo {
  4.     int x;
  5.     int y;
  6.     int z;
  7. };
  8.  
  9. struct foo_wrapper {
  10.         foo &ref;
  11.  
  12.         foo_wrapper( foo &f ) : ref( f ) {}
  13.         int &operator[]( std::size_t rhs ) {
  14.            switch(rhs) {
  15.            case 0U:
  16.                return ref.x;
  17.            case 1U:
  18.                return ref.y;
  19.            case 2U:
  20.                return ref.z;
  21.            default:
  22.                return *(&(ref.z) + rhs - 2U);
  23.            }
  24.         }
  25.  };
  26.  
  27. foo_wrapper wrap( foo &ff )
  28. {
  29. 	return foo_wrapper( ff );
  30. }
  31.  
  32. int main() {
  33.     foo f;
  34.     wrap( f )[1] = 123;
  35.     std::cout << f.y << std::endl;
  36. }
Success #stdin #stdout 0s 15232KB
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stdin
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Standard input is empty
stdout
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123
https://ideone.com/4Dpbcl
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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