英文:
Convert netip.Addr to net.IP for IPv4 address in Go
问题
我有一个IPv4地址，类型是netip.Addr（在Go 1.18中引入的新包/类型）。我想将我的IPv4地址转换为net.IP类型（https://pkg.go.dev/net#IP）。
我已经有两种方法可以将我的IPv4地址从一种类型转换为另一种类型：
// ip 是一个 netip.Addr
var dst_ip net.IP
dst_ip := net.ParseIP(ip.String())
// 或者
dst_ip := net.IPv4(ip.As4()[0], ip.As4()[1], ip.As4()[2], ip.As4()[3])
有没有更高效的方法来进行这种类型转换？
英文:
I have an IPv4 address as an netip.Addr (new package/type introduced with Go 1.18) https://pkg.go.dev/net/netip#Addr
I would like to convert my IPv4 address to net.IP type (https://pkg.go.dev/net#IP).
I already have 2 methods to convert my IPv4 from one type to another :
// ip is an netip.Addr
var dst_ip net.IP
dst_ip := net.ParseIP(ip.String())
// or
dst_ip := net.IPv4(ip.As4()[0], ip.As4()[1], ip.As4()[2], ip.As4()[3])
Is there a more efficient way to do this type conversion ?
答案1
得分: 5
以下是翻译好的内容：
这是一个示例，展示了如何更高效地进行操作。由于net.IP的底层类型是字节，我们可以将[]byte转换为net.IP类型：
package main
import (
"fmt"
"net"
"net/netip"
)
func main() {
// 示例 Addr 类型
addr, err := netip.ParseAddr("10.0.0.1")
fmt.Println(addr, err)
// 将 Addr 转换为 []byte
s := addr.AsSlice()
// 将字节切片转换为 net.IP（由于 net.IP 的底层类型也是 []byte，因此 net.IP 和 []byte 是相同的）
ip := net.IP(s)
fmt.Println(ip.IsPrivate())
// 看看是否一切正常，从 net.IP 创建 netip.Addr（在这里您还可以看到类型如何工作，因为 netip.AddrFromSlice 接受 []byte）
addrFromIp, ok := netip.AddrFromSlice(ip)
fmt.Println(addrFromIp, ok)
}
Playground 链接：https://go.dev/play/p/JUAMNHhdxUj
英文:
Here is an example how you could do this more efficient, as net.IP underlying type is bytes we are able to cast []byte to net.IP type:
package main
import (
"fmt"
"net"
"net/netip"
)
func main() {
// example Addr type
addr, err := netip.ParseAddr("10.0.0.1")
fmt.Println(addr, err)
// get Addr as []byte
s := addr.AsSlice()
// cast bytes slice to net.IP (it works as net.IP underlying type is also []byte so net.IP and []byte are identical)
ip := net.IP(s)
fmt.Println(ip.IsPrivate())
// lets see if everything works creating netip.Addr from net.IP (here you can also see how types work as netip.AddrFromSlice accepts []byte)
addrFromIp, ok := netip.AddrFromSlice(ip)
fmt.Println(addrFromIp, ok)
}
Playground link: https://go.dev/play/p/JUAMNHhdxUj
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