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  }
    42
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