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  1. #include <iostream>
  2. #include <tuple>
  3. #include <string>
  4.  
  5. struct Logger2
  6. {
  7.     explicit Logger2(const std::string& name) : name(name) {}
  8.     Logger2& operator << (const std::pair<const char*, const char*>& p)
  9.     {
  10.         std::cout << name << ":" << p.first << " " << p.second << std::endl;
  11.         return *this;
  12.     }
  13.     std::string name;
  14. };
  15.  
  16. struct Logger
  17. {
  18.     Logger& operator << (const std::string& s)
  19.     {
  20.         std::cout << "Log:" << s << std::endl;
  21.         return *this;
  22.     }
  23.  
  24.     Logger2 operator () (const std::string& name) const
  25.     {
  26.         return Logger2{name};
  27.     }
  28. };
  29.  
  30. #define LOG Logger{}
  31.  
  32.  
  33. int main()
  34. {
  35.     LOG << "old log";
  36.     LOG("NamedLogger") << std::make_pair("hello", "world");
  37. }
  38.  
Success #stdin #stdout 0s 3272KB
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stdin
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Standard input is empty
stdout
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Log:old log
NamedLogger:hello world
https://ideone.com/rmTh1f
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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