C ++通过运算符循环

int add(int l, int r){
  return l + r;
}

int sub(int l, int r){
  return l - r;
}

int mul(int l, int r){
  return l * r;
}

int div(int l, int r){
  return l / r;
}

int main(){
  typedef int (*op)(int,int);
  op ops[4] = {add, sub, mul, div};

  int a = 10, b = 5;
  for(int i=0; i < 4; ++i){
    ops[i](a,b);
  }
}

template<typename T>
std::vector<T> do_ops( const T& a, const T& b )
{
  std::vector<T> result;
  result.push_back( a + b );
  result.push_back( a - b );
  result.push_back( a * b );
  result.push_back( a / b );
  return result;
}

int main()
{
  std::vector<int> res = do_ops( 10, 5 );  
}