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\golang

GOROOT=c:\go

+teaching\golang\pkg

                  \windows_386

                    shape.a

                \src

                  \packages

                    packages.go

                  \shape

                    shape.go

go install shape  -> generates shape.a

go build packages.go

# packages

d:\src\teaching\golang\src\packages\packages.go:5: imported and not used: "shape"

d:\src\teaching\golang\src\packages\packages.go:8: undefined: Shape

d:\src\teaching\golang\src\packages\packages.go:19: undefined: Circle

形状.go

package shape

import (

    "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.go

package main

import (

    "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