Initialize a struct which contains vector

Question

I'm looking for a method for initializing a complex struct which contains vector in a single row.

For example if I have this structure:

struct A{
  double x;
  double y;
};
struct B{
  double z;
  double W;
};
struct C{
  A a;
  B b;
};

I can initialize C in this way: C c = {{0.0,0.1},{1.0,1.1}};

But what If I have to initialize a struct like this?

struct A{
  double x;
  double y;
};
struct B{
  vector<double> values;
};
struct C{
  A a;
  B b;
};

I have to do it in a single row because I want to allow the users of my application to specify in a single field all the initial values. And of course, I would prefer a standard way to do it and not a custom one.

Thanks!

Answer 1

You'll just have to use one of the constructors if you don't have the new C++11 initialization syntax.

    C c = {{1.0, 1.0}, {std::vector<double>(100)}};

The vector above has 100 elements. There's no way to initialize each element uniquely in a vector's construction.

You could do...

 double values[] = {1, 2, 3, 4, 5};
 C c = {{1.0, 1.0}, {std::vector<double>(values, values+5)}};

or if you always know the number of elements use a std::array which you can initialize the way you want.