CODEWITHSUNDEEP
c++cin
ebvtrnog
ebvtrnog

Reputation: 4397

Reading directly to struct in C++

Let's say I have some structure, for example a Rectangle:

struct Rectangle
{
    int x0, x1, y0, y1;
};

Is it possible to create a Rectangle struct in a way to be able to just call:

Rectangle rec;
cin >> rec;

? I think it should be possible to make it somehow, but I am not experienced enough.

Disclaimer

I am not looking for this:

cin >> rec.x0 >> rec.x1 >> rec.y0 >> rec.y1;

Upvotes: 1

Views: 103

Answers (2)

Mateusz Grzejek
Mateusz Grzejek

Reputation: 12068

Yes, the best solution is to overload operator>> for Rectangle:

struct Rectangle
{
    int x0, x1, y0, y1;
};

istream& operator>>(istream& s, Rectangle& r)
{
    s >> r.x0 >> r.x1 >> r.y0 >> r.y1;
    return s;
}

Upvotes: 4

R Sahu
R Sahu

Reputation: 206667

You can use:

Rectangle rec;
cin >> rec;

if you define an appropriate operator>> function.

std::istream& operator>>(std::istream& in, Rectangle& rec)
{
   return (in >> rec.x0 >> rec.x1 >> rec.y0 >> rec.y1);
}

If you are not allowed to define such a function, then you cannot use the syntax you want to use.

Upvotes: 10

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