iphone - <AppName>.pch file usage -


what importance of .pch file , significance of"#ifdef objc"?

also, define parameters "#ifdef is_production" checked in .pch file.

.pch pre-compile header.

in c , c++ programming languages, header file file text may automatically included in source file c preprocessor, specified use of compiler directives in source file.

#ifdef objc lets compiler know code objective-c.

#ifdef is_production have defined on own, directive telling compiler if defined, most-likely production build.


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