decorator pattern in C++

```
#include <iostream>
#include <string>

struct Shape {
  virtual std::string GetName() const = 0;
};

struct Circle : Shape {
  std::string GetName() const override {
    return std::string("A circle of radius ") + std::to_string(radius);
  }

  float radius = 10.0f;
};

struct ColoredShape : Shape {
  ColoredShape(const std::string& color, Shape* shape)
      : color(color), shape(shape) {}
  std::string GetName() const override {
    return shape->GetName() + " which is colored " + color;
  }

  std::string color;
  Shape* shape;
};

int main() {
  Circle circle;
  ColoredShape colored_shape("red", &circle);
  std::cout << colored_shape.GetName() << std::endl;
  return 0;
}
```
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