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    <p>You can use the macro</p> <pre><code>#define debug_print(expr...) NSLog(@"%@ is %@", @#expr, (expr)) </code></pre> <p>As you can see, the NSLog format string expects a %@ (object), so you need to use a variant for integers:</p> <pre><code>#define debug_printI(expr...) NSLog(@"%@ is %d", @#expr, (expr)) </code></pre> <p><strong>EDIT:</strong></p> <p>There is a way to use a single macro and have it work with all types: use @encoding to find the type.</p> <pre><code>NSString *print_debug_format_for_type(const char *encoding) { switch (encoding[0]) { case '@': return @"%@ is %@"; case '*': return @"%@ is %s"; case 'f': return @"%@ is %f"; case 'd': return @"%@ is %f"; case 'q': return @"%@ is %qi"; case 'Q': return @"%@ is %qu"; case 'c': case 'i': case 's': default: return @"%@ is %d"; } } #define debug_print(expr...) ({ \ typedef __typeof__(expr) t; \ NSLog(print_debug_format_for_type(@encode(t)), @#expr, (expr)); \ }) </code></pre> <p>With this, you can use debug_print anywhere with (almost) any type, as long as it's in the print_debug_format_for_type. The encodings that are passed in (from @encode) can be found <a href="https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html" rel="nofollow">here</a> [apple docs], and the formats for the format string can be found <a href="https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html#//apple_ref/doc/uid/TP40004265-SW1" rel="nofollow">here</a> [also apple docs]. As is, this works with any object, c-style string, integer, float, or double expression.</p> <p>(minor caveat: the ObjC BOOL type is actually a typedef'd char, so if you print_debug a boolean expression it will say it is a 1 or 0. While this works, it also means that if you print_debug a char expression, it will say it is the ascii number of the char. To change this behavior (and break BOOL printing), change case 'c' to <code>return @"%@ is %c"</code>.</p>
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    1. POIn Objective-C and Cocoa, is there a function debug_print(foobar) that will print out variable's name as well as dumping out it value?
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    1. USJared Pochtar
    1. USJared Pochtar
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    1. POIn Objective-C and Cocoa, is there a function debug_print(foobar) that will print out variable's name as well as dumping out it value?
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    1. COIf I may toot my own horn a bit, a more general implementation (which supports aggregate types) can be found here: http://jens.ayton.se/blag/almost-elegant-cave-man-debugging/ It’s a bit of a Swiss Army sledge hammer, but convenient at times.
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    2. CO@Jared if it involves a function, then it cannot be put into a `.h` file and get included by *two* or more files that use this marco, because multiple definition of function will exist... I try moving the function to a `debugp.m` and the macro to `debugp.h` and let `debugp.m` have the line `#import "debug.h"` but it doesn't work... do you know how?
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      1. US太極者無極而生
    3. COYup, you'll need to move the function into a file in order to include use the macro in more than one file. (Alternatively you can declare the function as static, but don't do that.) Can you tell me what the error is now, with the function in another file? I have the feeling you didn't declare the function prototype around the macro. It would be `NSString *print_debug_format_for_type(const char *encoding);`, preferably before the #define. The whole function would still need to be in the debugp.m as well.
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