英文:
How to pass a nested struct in Go
问题
一个小的应用程序，它读取一个配置文件并将其存储在一个struct中。如何将配置struct的一部分传递给fetchTemperature函数？
配置
package configuration
type Config struct {
Temperatures []struct {
Temperature
}
}
type Temperature struct {
AppId string
}
func Load() Config {
var c Config
// -- 8< -- snip -- 8< --
return c
}
主函数
package main
import "configuration"
var c configuration.Config = configuration.Load()
func main() {
for _, t := range c.Temperatures {
fetchTemperature(t)
}
}
func fetchTemperature(t configuration.Temperature) {
// -- 8< -- snip -- 8< --
}
给出的错误信息是：
cannot use t (type struct { configuration.Temperature }) as type configuration.Temperature in argument to fetchTemperature
t不是configuration.Temperature类型，那么如何传递这个struct呢？
英文:
A little 2 file application that reads a config file and stores it in a struct. How do pass part of the config struct to the fetchTemperature function?
Configuration
package configuration
type Config struct {
Temperatures []struct {
Temperature
}
}
type Temperature struct {
AppId string
}
func Load() Config {
var c Config
// -- 8< -- snip -- 8< --
return c
}
Main
package main
import "configuration"
var c configuration.Config = configuration.Load()
func main() {
for _, t := range c.Temperatures {
fetchTemperature(t)
}
}
func fetchTemperature(t configuration.Temperature) {
// -- 8< -- snip -- 8< --
}
Gives me:
cannot use t (type struct { configuration.Temperature }) as type configuration.Temperature in argument to fetchTemperature
Isn't t of configuration.Temperature and if not, how do I pass the struct around?
答案1
得分: 3
type Config struct {
Temperatures []struct {
Temperature
}
}
t 是 Config.Temperatures[i]。对于来自匿名结构体 struct { Temperature } 的 Temperature，可以使用 t.Temperature 来选择结构体中的字段。
例如，
package main
import "configuration"
var c configuration.Config = configuration.Load()
func main() {
for _, t := range c.Temperatures {
fetchTemperature(t.Temperature)
}
}
func fetchTemperature(t configuration.Temperature) {
// -- 8< -- snip -- 8< --
}
我怀疑你的困惑是因为你写了
type Config struct {
Temperatures []struct {
Temperature
}
}
Temperatures 是一个类型为匿名结构体 struct { configuration.Temperature } 的切片。
你可能想要的是
type Config struct {
Temperatures []Temperature
}
Temperatures 是一个类型为 configuration.Temperature 的切片。
英文:
type Config struct {
Temperatures []struct {
Temperature
}
}
t is Config.Temperatures[i]. For Temperature from anonymous struct { Temperature }, write t.Temperature to select the field from the struct.
For example,
package main
import "configuration"
var c configuration.Config = configuration.Load()
func main() {
for _, t := range c.Temperatures {
fetchTemperature(t.Temperature)
}
}
func fetchTemperature(t configuration.Temperature) {
// -- 8< -- snip -- 8< --
}
I suspect that your confusion arose because you wrote
type Config struct {
Temperatures []struct {
Temperature
}
}
Temperatures is a slice of type anonymous struct { configuration.Temperature }.
What you probably wanted was
type Config struct {
Temperatures []Temperature
}
Temperatures is a slice of type configuration.Temperature.
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