导入和未使用错误

Question

我不知道如何创建一个包并使用它。我正在使用 liteid 并转到 1.4.2 但这都可以从命令行重现。我能够创建看起来的形状包，但它不会从主包加载。GOPATH=d:\src\teaching\golangGOROOT=c:\go+teaching\golang\pkg                  \windows_386                    shape.a                \src                  \packages                    packages.go                  \shape                    shape.gogo install shape  -> generates shape.ago build packages.go# packagesd:\src\teaching\golang\src\packages\packages.go:5: imported and not used: "shape"d:\src\teaching\golang\src\packages\packages.go:8: undefined: Shaped:\src\teaching\golang\src\packages\packages.go:19: undefined: Circle形状.gopackage shapeimport (    "fmt")const (    pi = float64(3.14))type Shape interface {    Area() float64}type Circle struct {    x      int    y      int    radius int}func (c *Circle) Area() float64 {    return pi * float64(c.radius*c.radius)}func (c Circle) String() string {    return fmt.Sprintf("{x=%d, y=%d, radius=%d}", c.x, c.y, c.radius)}包.gopackage mainimport (    "fmt"    "shape")func calculateArea(shapes ...Shape) float64 {    sum := float64(0)    for _, v := range shapes {        sum += v.Area()    }    return sum}func main() {    circle := Circle{x: 1, y: 2, radius: 2}    fmt.Println(circle, circle.Area(), calculateArea(&circle))}有任何想法吗？

Answer 1

Shape在形状包中定义。您必须将其引用为shape.Shape