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  1. struct smth1
  2. {
  3.   void f() {}
  4. } a1;
  5.  
  6. struct smth2
  7. {
  8.   int f() { return 88; }
  9. } a2;
  10.  
  11. template <typename T> auto call(T *t)
  12. {
  13.   return t ? t->f() : decltype (t->f()) {};
  14. }
  15.  
  16. int main()
  17. {
  18.   call(&a1);
  19.   call(&a2);
  20.  
  21.   return 0;
  22. }
Compilation error #stdin compilation error #stdout 0s 4292KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In instantiation of ‘auto call(T*) [with T = smth1]’:
prog.cpp:18:11:   required from here
prog.cpp:13:12: error: compound literal of non-object type ‘void’
   return t ? t->f() : decltype (t->f()) {};
          ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
stdout
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Standard output is empty
https://ideone.com/cAlFlT
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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