public:
+ /// Discriminator for LLVM-style RTTI (dyn_cast<> et al.)
+ enum ShapeKind {
- + SquareKind,
- + CircleKind
+ + SK_Square,
+ + SK_Circle
+ };
+private:
+ const ShapeKind Kind;
public:
/// Discriminator for LLVM-style RTTI (dyn_cast<> et al.)
enum ShapeKind {
- SquareKind,
- CircleKind
+ SK_Square,
+ SK_Circle
};
private:
const ShapeKind Kind;
double SideLength;
public:
- Square(double S) : SideLength(S) {}
- + Square(double S) : Shape(SquareKind), SideLength(S) {}
+ + Square(double S) : Shape(SK_Square), SideLength(S) {}
double computeArea() /* override */;
};
double Radius;
public:
- Circle(double R) : Radius(R) {}
- + Circle(double R) : Shape(CircleKind), Radius(R) {}
+ + Circle(double R) : Shape(SK_Circle), Radius(R) {}
double computeArea() /* override */;
};
public:
/// Discriminator for LLVM-style RTTI (dyn_cast<> et al.)
enum ShapeKind {
- SquareKind,
- CircleKind
+ SK_Square,
+ SK_Circle
};
private:
const ShapeKind Kind;
class Square : public Shape {
double SideLength;
public:
- Square(double S) : Shape(SquareKind), SideLength(S) {}
+ Square(double S) : Shape(SK_Square), SideLength(S) {}
double computeArea() /* override */;
+
+ static bool classof(const Shape *S) {
- + return S->getKind() == SquareKind;
+ + return S->getKind() == SK_Square;
+ }
};
class Circle : public Shape {
double Radius;
public:
- Circle(double R) : Shape(CircleKind), Radius(R) {}
+ Circle(double R) : Shape(SK_Circle), Radius(R) {}
double computeArea() /* override */;
+
+ static bool classof(const Shape *S) {
- + return S->getKind() == CircleKind;
+ + return S->getKind() == SK_Circle;
+ }
};
.. code-block:: c++
enum ShapeKind {
- SquareKind,
- + SpecialSquareKind,
- + OtherSpecialSquareKind,
- CircleKind
+ SK_Square,
+ + SK_SpecialSquare,
+ + SK_OtherSpecialSquare,
+ SK_Circle
}
Then in ``Square``, we would need to modify the ``classof`` like so:
.. code-block:: c++
- static bool classof(const Shape *S) {
- - return S->getKind() == SquareKind;
+ - return S->getKind() == SK_Square;
- }
+ static bool classof(const Shape *S) {
- + return S->getKind() >= SquareKind &&
- + S->getKind() <= OtherSpecialSquareKind;
+ + return S->getKind() >= SK_Square &&
+ + S->getKind() <= SK_OtherSpecialSquare;
+ }
The reason that we need to test a range like this instead of just equality