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  1. #include <iostream>
  2.  
  3. int avar = 10;
  4. namespace Some
  5. {
  6.     int avar = 20;
  7.     namespace Thing
  8.     {
  9.            int avar = 30;
  10.            void Funky()
  11.            {
  12.               int a = avar; // a refers to the name inside Thing (Line 9), same as Some::Thing::avar
  13.               int b = Some::avar; // Some::avar refers to the name inside Some (Line 6)
  14.               int c = ::avar; // ::avar refers to the name in the global namespace (Line)
  15.               bool d = (10 == ::avar); // Compare the hard-coded value with the value of the global avar (true)
  16.               bool e = (avar == ::avar); // Compare local avar with the global avar (false)
  17.               bool f = (avar == Some::Thing::avar); // Compare local avar with itself (true)
  18.  
  19.               std::cout << a << ", "<< b << ", " << c << ", " << d << ", " << e << ", " << f << std::endl; // 30,20,10,1,0,1
  20.            }
  21.     }
  22. }
  23. int main() 
  24. {
  25.     Some::Thing::Funky();
  26. }
Success #stdin #stdout 0s 4396KB
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stdin
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Standard input is empty
stdout
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30, 20, 10, 1, 0, 1
https://ideone.com/lWSu5c
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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