I have some inherited classes:
struct BasicShape;
struct Circle : BasicShape;
struct NGon : BasicShape;
struct Star : NGon;
struct Triangle : NGon;
... and YAML file which contains the lines:
shapes:
small_circle: [circle, 5]
big_circle: [circle, 8]
star7: [ngon, 7, 3]
... which, obviously, represent different shapes with different options.
I'd like to convert the lines to instances of required classes. It's predictable, that I am using BasicShape * to handle everything I need.
Finally I ended up in writing 2 similar solutions:
Converting shapes instantly to the BasicShape *:
namespace YAML {
template<> struct convert<BasicShape *> { /* code goes here */ };
}
That was rejected later for it does not protect from memory leak.
Create a wrapper which delegates everything to pointer and destroy it if necessary:
struct Shape {
BasicShape * basic_shape;
/* code goes here */
};
namespace YAML {
template<> struct convert<Shape> { /* code goes here */ };
}
Is there another better way to cope with the task?
I have found question "Can I read a file and construct hetereogenous objects at compile time?" and the answer is great, but I don't need all the flexibility of answer given. I believe that the solution could be simplified in my case with or without (that's preferable) using BOOST.
