C ++中方法返回中的多个值组合

Question

I am trying to see if it is possible to combine multiple get values in the same way you can use a setter in C++. I am using examples from a book which puts each getter on a separate line.

an example I am using for a setter is as follows:

void setValues(int, int, string);

void myClass::setValues(int yrs, int lbs, string clr)
{
    this -> age = yrs;
    this -> weight = lbs;
    this -> color = clr;
}

Is it possible to do write single line of code for multiple getter values such as these?

int getAge(){return age;};
int getWeight(){return weight;}
string getColor(){return color;}

Answer 1

Sure, return a std::tuple by value:

std::tuple<int, int, string> getAllTheValues() const
{
    return std::make_tuple(age, weight, color);
}

or by reference:

std::tuple<int const&, int const&, string const&> getAllTheValues() const
{
    return std::tie(age, weight, color);
}

Though you probably don't want to actually write this sort of thing. Just pass the class itself around and use the single-getters you already have.

Answer 2

Here's one solution nobody mentioned yet:

struct values { int age; int weight; string color; };

values getValues() const
{
    return { this->age, this->weight, this->color };
}

Answer 3

You could pass by reference instead of returning a value for example:

void getValues(int & yrs, int & lbs, string & clr) const
{
   yrs = this->age;
   lbs = this->weight;
   clr = this->color;
}

Answer 4

You could write a function that gets references as input like so:

void getAllTheValues(int& age, int& weight, std::string& color) {
  age = this->age;
  weight = this->weight;
  color = this->color;
}

and use it like that

int age, weight;
string color;

myClass object();
object.getAllTheValues(age, weight, color);