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  1. struct X;
  2.  
  3. struct T
  4. {
  5.     T() { w = new X(); }
  6.  
  7. 	X *w;
  8.  
  9. };
  10.  
  11. struct X {
  12.  
  13. 	X() { }
  14.  
  15. 	T x;
  16. };
  17.  
  18. int main()
  19. {
  20.  
  21. }
  22.  
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 constructor 'T::T()':
prog.cpp:5:21: error: invalid use of incomplete type 'struct X'
     T() { w = new X(); }
                     ^
prog.cpp:1:8: note: forward declaration of 'struct X'
 struct X;
        ^
stdout
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Standard output is empty
https://ideone.com/BdzOAh
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
secret

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