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  1. class Base { };
  2.  
  3. class Derived;
  4.  
  5. Base* foo() { return new Derived(); }
  6.  
  7. int main()
  8. { 
  9.     return 0;
  10. }
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 function ‘Base* foo()’:
prog.cpp:5:34: error: invalid use of incomplete type ‘class Derived’
prog.cpp:3:7: error: forward declaration of ‘class Derived’
prog.cpp:5:37: warning: control reaches end of non-void function [-Wreturn-type]
stdout
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Standard output is empty
https://ideone.com/1liDGn
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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