C ++ language for simplifying name types (especially in function declarations)

Question

I am wondering if in C ++ there is a macro or language element that represents the same type as the return value in the function.

For instance:

std::vector<int> Myclass::CountToThree() const
{
  std::vector<int> col;
  col.push_back(1);
  col.push_back(2);
  col.push_back(3);
  return col;
}

std::vector<int> col;Is there some element of the language instead of the string ? I know this is pretty trivial, but I just get bored of it ,-).

Answer 1

You can do two things:

• Enter an alias , either or . using typedef

  typedef std::vector<int> IntVector;
  using IntVector = std::vector<int>;
  

  These two declarations are equivalent and provide a different name, which the compiler sees as a synonym for the original name. It can also be used for templates.

  , ? using ++ 11 typedefs .

• ++ 14 auto :

  auto Myclass::CountToThree() const
  {
      std::vector<int> col;
      col.push_back(1);
      col.push_back(2);
      col.push_back(3);
      return col;
  }
  

  .

Answer 2

std::vector<int> Myclass::CountToThree() const
{
    return {1,2,3};
}

, decltype, , , :

std::vector<int> Myclass::CountToThree() const
{
  decltype( CountToThree() ) col;
  col.push_back(1);
  col.push_back(2);
  col.push_back(3);
  return col;
}