printbuf

Documentation

Index

• type T
  • func (pb T) Error() string
  • func (pb *T) Sprintf(format string, args ...interface{})
  • func (pb *T) Sprintln(a ...interface{})

Types

type T

type T struct {
	*bytes.Buffer
}

Support buffered printing especially for error messages. This type implements the "error" interface allowing types that consume this one, as an anonymous field, to automatically project the public interface below easing the creation of a custom error type. A custom type coupled with a type assertion enables a swift and direct comparison mechanism to test for a specific error instead of inspecting the text of an errormessage.

Example

Define custom type called 'LoadFail':

type LoadFail struct {
	printbuf.T
}

Declare variable 'lf' based on 'LoadFail' custom type:

var lf LoadFail
lf.Sprintf("message")
...
var err error = lf;
...
if err.(LoadFail) {
	fmt.Fprintf(err.Error())
	//	output: "message"
}

Notes

* Currently not concurrency safe.

func (T) Error

func (pb T) Error() string

func (*T) Sprintf

func (pb *T) Sprintf(format string, args ...interface{})

func (*T) Sprintln

func (pb *T) Sprintln(a ...interface{})