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                當您在分析和調試復雜的程序時,無數個函數在不同的代碼文件中相互調用,如果這時候能夠準確地知道哪個文件中的具體哪個函數正在執行,對于調試是十分有幫助的。您可以使用?`runtime`?或?`log`?包中的特殊函數來實現這樣的功能。包`runtime`?中的函數?`Caller()`?提供了相應的信息,因此可以在需要的時候實現一個?`where()`?閉包函數來打印函數執行的位置: ~~~ where := func() { _, file, line, _ := runtime.Caller(1) log.Printf("%s:%d", file, line) } where() // some code where() // some more code where() ~~~ 您也可以設置?`log`?包中的 flag 參數來實現: ~~~ log.SetFlags(log.Llongfile) log.Print("") ~~~ 或使用一個更加簡短版本的?`where`?函數: ~~~ var where = log.Print func func1() { where() ... some code where() ... some code where() } ~~~
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