src/log/example_test.go

   1 // Copyright 2013 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package log_test
   6
   7 import (
   8         "bytes"
   9         "fmt"
  10         "log"
  11 )
  12
  13 func ExampleLogger() {
  14         var (
  15                 buf    bytes.Buffer
  16                 logger = log.New(&buf, "logger: ", log.Lshortfile)
  17         )
  18
  19         logger.Print("Hello, log file!")
  20
  21         fmt.Print(&buf)
  22         // Output:
  23         // logger: example_test.go:19: Hello, log file!
  24 }
  25
  26 func ExampleLogger_Output() {
  27         var (
  28                 buf    bytes.Buffer
  29                 logger = log.New(&buf, "INFO: ", log.Lshortfile)
  30
  31                 infof = func(info string) {
  32                         logger.Output(2, info)
  33                 }
  34         )
  35
  36         infof("Hello world")
  37
  38         fmt.Print(&buf)
  39         // Output:
  40         // INFO: example_test.go:36: Hello world
  41 }