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  1. class X
  2. {
  3.   public:
  4.    friend X& operator+=(X& x, const X& y);
  5. };
  6.  
  7. X& operator+=(X& x, const X& y) { return x; }
  8.  
  9. int main()
  10. {
  11.   X() += X();
  12. }
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 'int main()':
prog.cpp:11:12: error: no match for 'operator+=' in 'X() += X()'
prog.cpp:7:4: note: candidate is: X& operator+=(X&, const X&)
stdout
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Standard output is empty
https://ideone.com/BaQoe
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
secret

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