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// This example illustrates how C++ classes can be used from Go using SWIG.
package main
import (
"fmt"
. "example"
)
func main() {
// ----- Object creation -----
fmt.Println("Creating some objects:")
c := NewCircle(10)
fmt.Println(" Created circle", c)
s := NewSquare(10)
fmt.Println(" Created square", s)
// ----- Access a static member -----
fmt.Println("\nA total of", GetShapeNshapes(), "shapes were created")
// ----- Member data access -----
// Notice how we can do this using functions specific to
// the 'Circle' class.
c.SetX(20)
c.SetY(30)
// Now use the same functions in the base class
var shape Shape = s
shape.SetX(-10)
shape.SetY(5)
fmt.Println("\nHere is their current position:")
fmt.Println(" Circle = (", c.GetX(), " ", c.GetY(), ")")
fmt.Println(" Square = (", s.GetX(), " ", s.GetY(), ")")
// ----- Call some methods -----
fmt.Println("\nHere are some properties of the shapes:")
shapes := []Shape{c, s}
for i := 0; i < len(shapes); i++ {
fmt.Println(" ", shapes[i])
fmt.Println(" area = ", shapes[i].Area())
fmt.Println(" perimeter = ", shapes[i].Perimeter())
}
// Notice how the area() and perimeter() functions really
// invoke the appropriate virtual method on each object.
// ----- Delete everything -----
fmt.Println("\nGuess I'll clean up now")
// Note: this invokes the virtual destructor
// You could leave this to the garbage collector
DeleteCircle(c)
DeleteSquare(s)
fmt.Println(GetShapeNshapes(), " shapes remain")
fmt.Println("Goodbye")
}
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