英文:
Go: cannot call pointer method getFirstName on "Struct"
问题
我有一个简单的结构体和接收器。我试图用结构体设置映射，然后调用接收器。
像这样：
package main
import (
"fmt"
)
type myStruct struct {
FirstName string
LastName string
}
func (m *myStruct) GetFirstName() string {
return m.FirstName
}
func (m *myStruct) GetLastName() string {
return m.LastName
}
func main() {
testMyStruct := myStruct {
FirstName: "x1",
LastName: "x2",
}
myMapStruct["test2"] = testMyStruct
fmt.Println(myMapStruct["test2"].GetFirstName())
}
我得到了这个错误：
无法在myStruct上调用指针方法getFirstName
为什么我可以从映射中调用接收器方法？
英文:
I have a simple struct and receiver. I try to set the map with the struct and then call the receiver.
Like that:
package main
import (
"fmt"
)
type myStruct struct {
FirstName string
LastName string
}
func (m *myStruct) GetFirstName() string {
return m.FirstName
}
func (m *myStruct) GetLastName() string {
return m.LastName
}
func main() {
testMyStruct := myStruct {
FirstName: "x1",
LastName: "x2",
}
myMapStruct["test2"] = testMyStruct
fmt.Println(myMapStruct["test2"].GetFirstName())
}
I'm getting this error:
cannot call pointer method getFirstName on myStruct
Why can I call the receiver method from the map?
答案1
得分: 2
由于您传递了一个receiver指针，您必须使用指向结构体的指针来调用它，请查看下面的代码：
package main
import (
"fmt"
)
type myStruct struct {
FirstName string
LastName string
}
func (m *myStruct) GetFirstName() string {
return m.FirstName
}
func (m *myStruct) GetLastName() string {
return m.LastName
}
func main() {
testMyStruct := &myStruct {
FirstName: "x1",
LastName: "x2",
}
myMapStruct := make(map[string]*myStruct)
myMapStruct["test2"] = testMyStruct
fmt.Println(myMapStruct["test2"].GetFirstName())
}
在此处查看工作示例：链接
或者，如果将receiver作为值传递，可以使用以下方式：
package main
import (
"fmt"
)
type myStruct struct {
FirstName string
LastName string
}
func (m myStruct) GetFirstName() string {
return m.FirstName
}
func (m myStruct) GetLastName() string {
return m.LastName
}
func main() {
testMyStruct := myStruct {
FirstName: "x1",
LastName: "x2",
}
myMapStruct := make(map[string]myStruct)
myMapStruct["test2"] = testMyStruct
fmt.Println(myMapStruct["test2"].GetFirstName())
}
英文:
As you are passing a receiver pointer ,you have to use pointer to the struct to call it ,Please look at the below code
package main
import (
"fmt"
)
type myStruct struct {
FirstName string
LastName string
}
func (m *myStruct) GetFirstName() string {
return m.FirstName
}
func (m *myStruct) GetLastName() string {
return m.LastName
}
func main() {
testMyStruct := &myStruct {
FirstName: "x1",
LastName: "x2",
}
myMapStruct:=make(map[string]*myStruct)
myMapStruct["test2"] = testMyStruct
fmt.Println(myMapStruct["test2"].GetFirstName())
}
See working here
or You can use like below if passing receiver as value
package main
import (
"fmt"
)
type myStruct struct {
FirstName string
LastName string
}
func (m myStruct) GetFirstName() string {
return m.FirstName
}
func (m myStruct) GetLastName() string {
return m.LastName
}
func main() {
testMyStruct := myStruct {
FirstName: "x1",
LastName: "x2",
}
myMapStruct:=make(map[string]myStruct)
myMapStruct["test2"] = testMyStruct
fmt.Println(myMapStruct["test2"].GetFirstName())
}
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