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class Matrix {};
 
Matrix operator+(const Matrix &a, Matrix &&b     ) {}
Matrix operator+(Matrix &&a,      const Matrix &b) {}
Matrix operator+(const Matrix &a, const Matrix &b) {}
 
Matrix operator*(const Matrix &a, Matrix &&b     ) {}
Matrix operator*(Matrix &&a,      const Matrix &b) {}
Matrix operator*(const Matrix &a, const Matrix &b) {}
 
 
int main() 
{
  Matrix a,b,c,d;
  Matrix x = a*b + c*d;
}
 

prog.cpp: In function 'int main()':
prog.cpp:15:22: error: ambiguous overload for 'operator+' in 'operator*(((const Matrix&)((const Matrix*)(& a))), ((const Matrix&)((const Matrix*)(& b)))) + operator*(((const Matrix&)((const Matrix*)(& c))), ((const Matrix&)((const Matrix*)(& d))))'
prog.cpp:3:8: note: candidates are: Matrix operator+(const Matrix&, Matrix&&)
prog.cpp:4:8: note:                 Matrix operator+(Matrix&&, const Matrix&)
prog.cpp:5:8: note:                 Matrix operator+(const Matrix&, const Matrix&)

Standard output is empty