Any way to replace part of word with the preprocessor?

Question

I have something like this in my objective-C class

@interface PREFIX_MyClass {
...
@end

and I'd like to use the preprocessor to convert it to:

@interface AwesomeMyClass {
...
@end

so something like

#define PREFIX_ Awesome

doesn't work because it's a part of a word. Any other way? I know I can use something like this:

#define PrefixClass(NAME) Awesome##NAME

@interface PrefixClass(MyClass)

but I don't like this because it breaks code complete and reference following in dev tools (i.e.: Xcode in this case)

Just curious, is this a namespace hack? I'm trying to understand the reason behind what you are trying to do, and I simply cannot see it. — Sergey Kalinichenko, May 03 '12 at 00:46
@dashblinkenlight yeah, it's an automated namespacing thing. — pho0, May 03 '12 at 01:03
I'm sure I saw an open source project that does this, but I cannot for the life of me find it again. — malhal, May 18 '16 at 10:50

score 2 · Answer 1 · answered May 03 '12 at 01:58

2

This isn't very elegant, but you could use the preprocessor to replace the entire class name instead of just part.

#define PREFIX_MyClass AwesomeMyClass
@interface PREFIX_MyClass

Of course, this becomes an issue if you use the prefix more than once and it changes. You could fix this using by using another calling another macro to add the prefix, so that only one macro contains the actual prefix.

#define ADD_PREFIX(name) Awesome##name
#define PREFIX_MyClass ADD_PREFIX(MyClass)
@interface PREFIX_MyClass

This still requires a macro for everything you want to prefix, but code completion will recognize the PREFIX_MyClass name.

answered May 03 '12 at 01:58

ughoavgfhw

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Yeah, this is actually how I'm doing it now. I was hoping to get something that didn't require a new define for every class. – pho0 May 03 '12 at 02:15
@pho0 Then just declare all classes through macro: `@interface ADD_PREFIX(MyClass)` – Agnius Vasiliauskas May 03 '12 at 07:45
@0x69, the issue there is that I lose reference following and code complete support. I may be asking for too much ;) – pho0 May 03 '12 at 16:48
Any idea how to achieve this for methods? – malhal May 18 '16 at 10:59

score 0 · Answer 2 · answered May 03 '12 at 04:32

0

This is not exactly what you're asking for, but it may be another route to accomplish your goal. Xcode allows you to define a class prefix for your project. Select your project in the file navigator, and in the file inspector (first "tab" of the right sidebar) you will have this:

enter image description here

Whatever text you put into the "Class Prefix" field will be prepended to the names of any classes you create in that project.

answered May 03 '12 at 04:32

jscs

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Jacques, yeah, we considered this but we need the prefixes to be changeable by editing preprocessors stuffs. – pho0 May 03 '12 at 16:51

Any way to replace part of word with the preprocessor?

2 Answers2

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