英文:
Error in Go's slices exercise
问题
我正在尝试解决切片练习。我目前的解决方案是：
package main
import "golang.org/x/tour/pic"
func Pic(dx, dy int) [][]uint8 {
picture := make([][]uint8, dy)
x := dx
for iy := 0; iy < dy; iy++ {
picture[iy] = make([]uint8, dx)
for ix := 0; ix < dx; ix++ {
x = (x+dy)/2
picture[iy][ix] = uint8(x)
}
}
return picture
}
func main() {
pic.Show(Pic(1,2))
}
但是我得到了以下错误：
tmp/sandbox931798243/main.go:23: cannot use Pic(1, 2) (type [][]uint8)
as type func(int, int) [][]uint8 in argument to pic.Show
我做错了什么？这可能是沙盒的一个错误吗？
英文:
I'm trying to solve the slices exercise. My current solution is
package main
import "golang.org/x/tour/pic"
func Pic(dx, dy int) [][]uint8 {
picture := make([][]uint8, dy)
x := dx
for iy := 0; iy < dy; iy++ {
picture[iy] = make([]uint8, dx)
for ix := 0; ix < dx; ix++ {
x = (x+dy)/2
picture[iy][ix] = uint8(x)
}
}
return picture
}
func main() {
pic.Show(Pic(1,2))
}
But I'm getting the following error
> tmp/sandbox931798243/main.go:23: cannot use Pic(1, 2) (type [][]uint8)
> as type func(int, int) [][]uint8 in argument to pic.Show
What am I doing wrong? Might that be a bug with the sandbox?
答案1
得分: 6
pic.Show 接受一个类型为 func(int, int) [][]uint8 的单个参数 - 你需要传递一个函数给它。你现在传递的是执行 func(int, int) [][]uint8 的结果，也就是一个 [][]uint8。你想要的是：
pic.Show(Pic)
传递你的函数 Pic 本身，它符合要求。
英文:
pic.Show takes a single argument of type func(int, int) [][]uint8 - you need to pass it a function. You're passing the result of executing a func(int, int) [][]uint8, i.e. a [][]uint8. What you want would be:
pic.Show(Pic)
Passing in your function Pic itself, which meets the requirements.
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