added inheritance based on interfaces (41583d70) · Commits · bsmrgo / playground

inheritance/circle/circle.go

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		package circle

		import (
		"fmt"
		"math"
		)

		// CircleT ...
		type CircleT struct {
		r float64
		}

		// New ...
		func New(r float64) *CircleT {
		return &CircleT{
		r: r,
		}
		}

		const (
		formatString = "circle{radius:%f}"
		)

		// String ...
		func (c *CircleT) String() string {
		return fmt.Sprintf(formatString, c.r)
		}

		// Area ...
		func (c *CircleT) Area() float64{
		return math.Pi * math.Pow(c.r, 2.0)
		}

		// Perimeter ...
		func (c *CircleT) Perimeter() float64{
		return 2.0 * c.r * math.Pi
		}
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		package inheritance

		import (
		"testing"
		"repositories.muehmer.net/bsmrgo/playground/inheritance/circle"
		"repositories.muehmer.net/bsmrgo/playground/inheritance/rectangle"
		)

		func TestGeometry(t *testing.T){
		for _, g := range []Geometrier{
		circle.New(1),
		rectangle.New(3,4),
		} {
		t.Logf("%s: Area():%f - Perimeter():%f", g, g.Area(), g.Perimeter())
		}
		}
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		package rectangle

		import (
		"fmt"
		)

		// RectangleT ...
		type RectangleT struct {
		a, b float64
		}

		// New ...
		func New(a,b float64) *RectangleT {
		return &RectangleT{
		a: a,
		b: b,
		}
		}

		const (
		formatString = "rectangle{a:%f,b:%f}"
		)

		// String ...
		func (r *RectangleT) String() string {
		return fmt.Sprintf(formatString, r.a, r.b)
		}

		// Area ...
		func (r *RectangleT) Area() float64{
		return r.a * r.b
		}

		// Perimeter ...
		func (r *RectangleT) Perimeter() float64{
		return 2.0*(r.a + r.b)
		}