Hello group, If an operand of fmt.Printf implements method String() string, fmt.Printf respects it and uses it. But it doesn't if an operand is a a struct that has such an element.
For example, https://play.golang.org/p/QJC7Q9Kpch: package main import "fmt" type Int int func (i Int) String() string { return fmt.Sprintf("Int(%d)", int(i)) } type Box struct{ elem Int } func main() { format := "%[1]v\t%+[1]v\t%#[1]v\n" i := Int(73) fmt.Printf(format, i) fmt.Printf(format, &Box{i}) fmt.Printf(format, []Int{i}) fmt.Printf(format, map[string]Int{"hello":i}) } Output: Int(73) Int(73) 73 &{73} &{elem:73} &main.Box{elem:73} [Int(73)] [Int(73)] []main.Int{73} map[hello:Int(73)] map[hello:Int(73)] map[string]main.Int{"hello":73} In the second line of the output, none of the format specifiers ("%v", "%+v" , "%#v") calls the String() method of Int, in contrast to the first line. Isn't this an inconsistency that should be fixed? Or is it intended behavior? -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
