printer

type Printer interface {
	SetOutput(w io.Writer)

	Print(a ...interface{}) (n int, err error)
	Printf(format string, a ...interface{}) (n int, err error)
	Println(a ...interface{}) (n int, err error)
}

type SimplePrinter struct {
	WritePrinter
	// contains filtered or unexported fields
}

type WritePrinter interface {
	Printer
	io.Writer
}