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Effective Go: update examples to use new logging interface.

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R=adg
CC=golang-dev
https://golang.org/cl/2468041
This commit is contained in:
Rob Pike 2010-10-12 16:56:50 -07:00
parent 96868c70ea
commit e787f8276d
1 changed files with 9 additions and 9 deletions
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18
doc/effective_go.html
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@ -463,7 +463,7 @@ statement, it's common to see one used to set up a local variable.
<pre>
if err := file.Chmod(0664); err != nil {
log.Stderr(err)
log.Print(err)
return err
}
</pre>
@ -815,7 +815,7 @@ which is much clearer than placing it at the end of the function.
</p>
<p>
The arguments to the deferred function (which includes the receiver if
The arguments to the deferred function (which include the receiver if
the function is a method) are evaluated when the <i>defer</i>
executes, not when the <i>call</i> executes. Besides avoiding worries
about variables changing values as the function executes, this means
@ -1288,7 +1288,7 @@ func offset(tz string) int {
if seconds, ok := timeZone[tz]; ok {
return seconds
}
log.Stderr("unknown time zone", tz)
log.Println("unknown time zone", tz)
return 0
}
</pre>
@ -1455,13 +1455,13 @@ Within the function <code>Printf</code>, <code>v</code> acts like a variable of
<code>[]interface{}</code> but if it is passed to another variadic function, it acts like
a regular list of arguments.
Here is the implementation of the
function <code>log.Stderr</code> we used above. It passes its arguments directly to
function <code>log.Println</code> we used above. It passes its arguments directly to
<code>fmt.Sprintln</code> for the actual formatting.
</p>
<pre>
// Stderr is a helper function for easy logging to stderr. It is analogous to Fprintln(os.Stderr).
func Stderr(v ...interface{}) {
stderr.Output(2, fmt.Sprintln(v)) // Output takes parameters (int, string)
// Println prints to the standard logger in the manner of fmt.Println.
func Println(v ...interface{}) {
std.Output(2, fmt.Sprintln(v...)) // Output takes parameters (int, string)
}
</pre>
<p>
@ -2133,7 +2133,7 @@ func NewJob(command string, logger *log.Logger) *Job {
or with a composite literal,
</p>
<pre>
job := &amp;Job{command, log.New(os.Stderr, nil, "Job: ", log.Ldate)}
job := &amp;Job{command, log.New(os.Stderr, "Job: ", log.Ldate)}
</pre>
<p>
If we need to refer to an embedded field directly, the type name of the field,
@ -2675,7 +2675,7 @@ func server(workChan <-chan *Work) {
func safelyDo(work *Work) {
defer func() {
if err := recover(); err != nil {
log.Stderr("work failed:", err)
log.Println("work failed:", err)
}
}()
do(work)