Initializing a String Pointer in a Go Struct
In Go, structs can contain pointers to other values, including strings. While it's straightforward to initialize strings directly in structs, initializing string pointers can present a challenge.
Problem
When attempting to initialize a struct with a string pointer (*string) as a default value, an error occurs:
cannot use "string" (type string) as type *string in field value
Solution
To initialize a string pointer in a struct, you can't directly assign a constant string value to it. Instead, create a variable, assign the value to it, and then pass the variable's address to the string pointer:
type Config struct {
Uri *string
}
func init() {
v := "my:default"
var config = Config{ Uri: &v }
}By using the & operator, you obtain the address of the variable (&v), which can then be assigned to the string pointer. This enables the comparison of two struct instances where Uri can be nil if not set.
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