__file__或__line__在golang中类似

Question

is there any function in go that is similar like "_file_" or "_line_" in go, to know who is calling a specific function during run time? In C we have the "_file_" line that can be called as macros. How to do this in go?

Answer 1

If you're using the log package, you can instruct the logger to prefix the entries with various information. You'll likely be most interested in the Lshortfile constant, which will result in prefixes along the lines of d.go:23. Alternatively, there is Llongfile which prints the file's full path (such as /a/b/c/d.go:23).

If you don't want to use the log package, you could also use runtime.Caller(), which is what the log package uses internally. It's not as straight forward as the C macros, but you could hide it behind a function (and specify the correct call depth). You can see how the log package is implemented for an example (line 140).