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  1. #include <streambuf>
  2. #include <ios>    
  3. #include <thread>
  4. #include <sstream>
  5.  
  6. class seppjs_thread_logger_streambuf : public std::streambuf
  7. {
  8. public:
  9.   seppjs_thread_logger_streambuf(std::ios& in) : in(in), buf (in.rdbuf()), newline(true)
  10.   {
  11.     in.rdbuf(this);
  12.   }
  13.   ~seppjs_thread_logger_streambuf()
  14.   {
  15.     in.rdbuf(buf);
  16.   }
  17.   seppjs_thread_logger_streambuf(const seppjs_thread_logger_streambuf&) = delete;
  18.   seppjs_thread_logger_streambuf& operator=(const seppjs_thread_logger_streambuf&) = delete;
  19.  
  20. private:
  21.   std::ios& in;
  22.   std::streambuf* buf;
  23.   bool newline;
  24. protected:
  25.   virtual int_type overflow(int_type c)
  26.   {
  27.     if(newline)
  28.       {
  29.         std::stringstream message;
  30.         message << "Task " << std::this_thread::get_id() << ": ";
  31.         buf->sputn(message.str().data(), message.str().size());
  32.         newline = false;
  33.       }
  34.     if (traits_type::eq_int_type(c, traits_type::to_int_type('\n')))
  35.       newline = true;
  36.     buf->sputc(c);
  37.     return c;  
  38.   }
  39. };
  40.  
  41.  
  42. // Beispielanwendung
  43. #include <iostream>
  44.  
  45. void function()
  46. {
  47.   std::cout << "Blah\nBlupp\nBäh\n";  
  48. }
  49.  
  50. int main()
  51. {
  52.   seppjs_thread_logger_streambuf foo(std::cout);
  53.   std::thread t1(function), t2(function);
  54.  
  55.   t1.join();
  56.   t2.join();
  57. }
  58.  
Success #stdin #stdout 0s 20880KB
comments (?)
stdin 
Standard input is empty
stdout 
Task 3066940224: Blah
Task 3066940224: Blupp
Task 3066940224: Bäh
Task 3075328832: Blah
Task 3075328832: Blupp
Task 3075328832: Bäh
https://ideone.com/i6YeBH
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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