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  1.  
  2. #include <string>
  3. #include <iostream>
  4.  
  5. #define PFUNC() do { std::cout << __FUNCTION__ << "\n"; } while (0)
  6.  
  7. class MyFoo;
  8.  
  9. class MyBar {
  10.  
  11.     MyFoo* foo;
  12.  
  13. public:
  14.  
  15.     MyBar(MyFoo* foo) : foo(foo) {
  16.     }
  17.  
  18.     void DoStuff() {
  19.         PFUNC();
  20.         foo->DoStuff();
  21.     }
  22. };
  23.  
  24. class MyFoo {
  25.  
  26. public:
  27.  
  28.     void DoStuff() {
  29.         PFUNC();
  30.     }
  31. };
  32.  
  33. int main() {
  34.     MyFoo foo;
  35.     MyBar bar(&foo);
  36.  
  37.     bar.DoStuff();
  38. }
  39.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In member function ‘void MyBar::DoStuff()’:
prog.cpp:20:12: error: invalid use of incomplete type ‘class MyFoo’
prog.cpp:7:7: error: forward declaration of ‘class MyFoo’
stdout
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Standard output is empty
https://ideone.com/ASo7LI
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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