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  1. #include <cstdio>
  2.  
  3. template <class T>
  4. class Writer
  5. {
  6.   public:
  7.     Writer()  { }
  8.     ~Writer()  { }
  9.  
  10.     void write(const char* str) const
  11.     {
  12.       static_cast<const T*>(this)->writeImpl(str);
  13.     }
  14. };
  15.  
  16. class ConsoleWriter : public Writer<ConsoleWriter>
  17. {
  18.   public:
  19.     ConsoleWriter() { }
  20.     ~ConsoleWriter() { }
  21.  
  22.     void writeImpl(const char* str) const
  23.     {
  24.       printf("%s\n", str);
  25.     }
  26. };
  27.  
  28. class ConsoleWriterNoInheritance
  29. {
  30.   public:
  31.     ConsoleWriterNoInheritance() { }
  32.     ~ConsoleWriterNoInheritance() { }
  33.  
  34.     void write(const char* str) const
  35.     {
  36.       printf("%s\n", str);
  37.     }
  38. };
  39.  
  40.  
  41. int main()
  42. {
  43.   ConsoleWriter writer;
  44.   writer.write("Hello world");
  45.   ConsoleWriterNoInheritance other_writer;
  46.   other_writer.write("Other");
  47.   return 0;
  48. }
Success #stdin #stdout 0s 2896KB
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stdin
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Standard input is empty
stdout
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Hello world
Other
https://ideone.com/BKK0Ff
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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