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  1. // Target class.
  2.  
  3. class c {
  4.     static int si;
  5.     int i;
  6.     void fi( int arg ) { si = i = arg; }
  7. };
  8.  
  9. int c::si;
  10.  
  11. // Library code.
  12.  
  13. template< typename type, type value, typename tag >
  14. class access_bypass {
  15.     friend type get( tag )
  16.         { return value; }
  17. };
  18.  
  19. // Client code.
  20.  
  21. struct pcsi {};
  22. struct pci {};
  23. struct pcfi {};
  24.  
  25. int * get( pcsi );
  26. int c::* get( pci );
  27. void (c::* get( pcfi ) )( int );
  28.  
  29. template class access_bypass< int *, & c::si, pcsi >;
  30. template class access_bypass< int c::*, & c::i, pci >;
  31. template class access_bypass< void (c::*)( int ), & c::fi, pcfi >;
  32.  
  33. #include <iostream>
  34.  
  35. int main() {
  36.     c a, b;
  37.  
  38.     a.* get( pci() ) = 3;
  39.     b.* get( pci() ) = 5;
  40.     * get( pcsi() ) = 8;
  41.  
  42.     std::cout << a.* get( pci() ) << ' ' << b.* get( pci() ) << ' ' << * get( pcsi() ) << '\n';
  43.  
  44.     (a.* get( pcfi() ) )( 7 );
  45.  
  46.     std::cout << a.* get( pci() ) << ' ' << b.* get( pci() ) << ' ' << * get( pcsi() ) << '\n';
  47. }
Success #stdin #stdout 0s 2896KB
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stdin
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Standard input is empty
stdout
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3 5 8
7 5 7
https://ideone.com/a34OQS
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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