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How to solve golang error: cannot refer to unexported name 'x' in package 'y'
In the process of using golang development, we may encounter this Error: "cannot refer to unexported name 'x' in package 'y'". This error is mainly caused when we access unexported variables or functions.
In golang, the case of the first letter of variable and function names determines their visibility. An identifier is exportable if its first letter is an uppercase letter; if its first letter is a lowercase letter, it is not exportable. Non-exportable variables or functions can only be accessed within the same package and cannot be directly accessed by other packages. When we try to access unexported variables or functions in other packages, the above error will occur.
So, how to solve this problem? The following are several solution strategies:
Code example:
package y var x string // 不可导出的变量 func foo() { // 不可导出的函数 }
Modified code:
package y var X string // 可导出的变量 func Foo() { // 可导出的函数 }
Code example:
package y var x string // 不可导出的变量 func getX() string { return x }
Called in other packages:
package main import ( "fmt" "package/y" ) func main() { x := y.getX() fmt.Println(x) }
Code example:
package y type privateType struct { data int } func (p *privateType) privateMethod() { fmt.Println(p.data) } type PublicInterface interface { PublicMethod() } func CreatePrivateType() PublicInterface { return &privateType{} } func (p *privateType) PublicMethod() { p.privateMethod() }
Used in other packages:
package main import ( "package/y" ) func main() { p := y.CreatePrivateType() p.PublicMethod() // 可以调用 p.privateMethod() // 无法调用,报错 }
Through the above solutions, we can solve the golang error: "cannot refer to unexported name 'x' in package 'y'". Choosing the appropriate strategy according to the specific situation can make our code more readable, maintainable, and improve code reusability.
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