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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I'm trying to write a function that takes in a struct pointer and points it to another address.
struct
I know I can simply write a function that takes a pointer and manipulates struct fields like so:
func ManipulateStruct(myPointer *MyStruct) { myPointer.Field1 = "new value" myPointer.Field2 = 10 }
However, is it possible to write something like:
func ManipulateStruct(myPointer *MyStruct) { newPointer := new(MyStruct) newPointer.Field1 = "new value" newPointer.Field2 = 10 // myPointer = &newPointer <-- illegal // cannot use &newPointer (type **MyStruct) as type *MyStruct in assignment myPointer = newPointer }
Using new makes a pointer to your struct so you need pointer like this:
new
package main import "fmt" func main() { var ptr *MyStruct ManipulateStruct(&ptr) fmt.Println(ptr) } func ManipulateStruct(myPointer **MyStruct) { newPointer := new(MyStruct) newPointer.Field1 = "new value" newPointer.Field2 = 10 *myPointer = newPointer } type MyStruct struct { Field1 string Field2 int }
Output:
&{new value 10}
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