example_test.go

Documentation: log

		 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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