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  1. #include <iostream>
  2.  
  3. struct Reader {
  4.     virtual void action() = 0;
  5. };
  6.  
  7. struct Writer {
  8.     virtual void action() = 0;
  9. };
  10.  
  11. struct ReadWriter {
  12.  
  13.     int i;
  14.  
  15.     struct ReaderAdapter : Reader {
  16.         ReadWriter *rw;
  17.  
  18.         ReaderAdapter( ReadWriter *rw ) : rw( rw ) {}
  19.  
  20.         void action() override {
  21.             rw->read_action();
  22.         }
  23.     } reader;
  24.  
  25.     struct WriterAdapter : Writer {
  26.         ReadWriter *rw;
  27.  
  28.         WriterAdapter( ReadWriter *rw ) : rw( rw ) {}
  29.  
  30.         void action() override {
  31.             rw->write_action();
  32.         }
  33.     } writer;
  34.  
  35.     ReadWriter( int i = 0 ) : i( i ), reader( this ), writer( this ) {}    
  36.  
  37.     void read_action() {
  38.         std::cout << "reader " << i << "\n";
  39.     }
  40.  
  41.     void write_action() {
  42.         std::cout << "writer " << i << "\n";
  43.     }    
  44.  
  45.     operator Reader*() {
  46.         return &this->reader;
  47.     }
  48.  
  49.     operator Writer*() {
  50.         return &this->writer;
  51.     }
  52. };
  53.  
  54. void use_reader( Reader* reader ) {
  55.     reader->action();
  56. }
  57.  
  58. void use_writer( Writer* writer ) {
  59.     writer->action();
  60. }
  61.  
  62. int main() {
  63.     ReadWriter rw( 10 );
  64.  
  65.     use_reader( rw );
  66.     use_writer( rw );
  67.  
  68.     return 0;
  69. }
  70.  
Success #stdin #stdout 0s 3456KB
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stdin
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Standard input is empty
stdout
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reader 10
writer 10
https://ideone.com/uDsHaT
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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