golang function pointer with object instance (or whatever it's called) https://go.dev/play/p/RsPDtGf_DJe

funcptr_obj.go

//
// does assigning a function pointer carry with it the associated object?
//
package main

import "fmt"

// a "function pointer" and its implementation (well, one of it)
var FuncPtr func(v string)
func a(v string) {
	fmt.Printf("func a, from %s\n", v)
}

// some object and a method, matching the FuncPtr signature
type Obj int
func (o *Obj) Print(s string) {
	fmt.Printf("Print obj %d, from %s\n", *o, s)
}

func main() {
	// assign default impl
	FuncPtr = a
	FuncPtr("main") // call it

	o := Obj(52)
	FuncPtr = o.Print

	FuncPtr("main") // call it
}