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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. struct protocol_callbacks
  5. {
  6.     using func_t = std::function<int(uint8_t*, size_t)>;
  7.  
  8.     protocol_callbacks(func_t a_reader, func_t a_writer) :
  9.         reader(a_reader),
  10.         writer(a_writer) {}
  11.     func_t reader;
  12.     func_t writer;
  13. };
  14.  
  15. int writer(uint8_t*, size_t)
  16. {
  17.     std::cout << "function writer\n";
  18.     return 0;
  19. }
  20. int reader(uint8_t*, size_t)
  21. {
  22.     std::cout << "function writer\n";
  23.     return 0;
  24. }
  25.  
  26. int bad_writer(uint16_t*, size_t) { return 0; }
  27.  
  28. int main ()
  29. {
  30.     int x = 9;
  31.     protocol_callbacks pc1(reader, writer);
  32.     protocol_callbacks pc2([=](uint8_t*, size_t)
  33.                            {
  34.                                std::cout << "lambda reader: " << x << "\n";
  35.                                return 0;
  36.                            },
  37.                            [=](uint8_t*, size_t)
  38.                            {
  39.                                std::cout << "lambda writer: " << x << "\n";
  40.                                return 0;
  41.                            });
  42.  
  43.     pc1.reader(nullptr, 0);
  44.     pc1.writer(nullptr, 0);
  45.  
  46.     pc2.reader(nullptr, 0);
  47.     pc2.writer(nullptr, 0);
  48.     //protocol_callbacks pc3(bad_writer, reader);
  49. }
  50.  
Success #stdin #stdout 0s 3032KB
comments (?)
stdin
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Standard input is empty
stdout
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function writer
function writer
lambda reader: 9
lambda writer: 9
https://ideone.com/hG7tqc
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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