汎用的な構造体初期化関数の例

main.go

package main

import "fmt"

func main() {
	foo := Foo{}
	InitFoo(&foo)
	fmt.Printf("%+v\n", foo)

	bar := Bar{}
	InitBar(&bar)
	fmt.Printf("%+v\n", bar)
}

type.go

package main

import (
	"reflect"
)

type Foo struct {
	ID       int
	Name     string
	FooValue int
}

type Bar struct {
	ID       int
	Name     string
	BarValue string
}

func initCommonFields(obj interface{}) {
	v := reflect.ValueOf(obj).Elem()
	v.FieldByName("ID").SetInt(1234)
	v.FieldByName("Name").SetString("abc")
}

func InitFoo(foo *Foo) {
	initCommonFields(foo)
	foo.FooValue = 100
}

func InitBar(bar *Bar) {
	initCommonFields(bar)
	bar.BarValue = "bar"
}