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January 11, 2016 18:01
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Go debug code from Rob Pike. Updated with a Println that works (thanks guelfey from #go-nuts)
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| const debug debugging = true // or flip to false | |
| type debugging bool | |
| func (d debugging) Println(args ...interface{}) { | |
| if d { | |
| log.Println(append([]interface{}{"DEBUG:"}, args...)...) | |
| } | |
| } | |
| func (d debugging) Printf(format string, args ...interface{}) { | |
| if d { | |
| log.Printf("DEBUG:" + format, args...) | |
| } | |
| } |
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My understanding is that this is from https://github.com/golang/glog and relies on the compiler inlining these nop functions when the const debug is set to false (https://groups.google.com/forum/#!topic/golang-nuts/TzuGe1rcQ4Y).
I'm personally using this pattern only as a temporary solution for in-line debugging calls in application code, as the compiler output still has effects from the debug code (nop calls and code memory use). This 'if debug' pattern relies on a compilation feature (inlining functions/methods with no effects, and removing the nop inline) that has to be implemented correctly for each platform to work as expected.