public TResult Match <TResult>(OnCircle <TResult> circle,
OnRectangle <TResult> rectangle)
{
switch (Tag)
{
case ShapeCase.Circle:
return(circle(Radius));
case ShapeCase.Rectangle:
return(rectangle(Height, Width));
default:
throw new InvalidOperationException();
}
}
public TResult Match <TResult>(OnCircle <TResult> circle,
OnEquilateralTriangle <TResult> equilateralTriangle,
OnSquare <TResult> onSquare,
OnRectangle <TResult> rectangle)
{
switch (Tag)
{
case ShapeCase.Circle:
return(circle(Radius));
case ShapeCase.EquilateralTriangle:
return(equilateralTriangle(SideLen));
case ShapeCase.Square:
return(onSquare(SideLen));
case ShapeCase.Rectangle:
return(rectangle(Height, Width));
default:
throw new InvalidOperationException();
}
}
