List of all Objective-C preprocessor directives in

问题:

Is there some list of all Objective-C preprocessor directives in Clang? I'm talking about #pragma mark - Section I or #pragma unused (variableName) or #warning - message.

I would like to know more of them to improve my code, but Googling "llvm preprocessor directives" gave me this link: http://clang.llvm.org/docs/UsersManual.html, which does not list all the directives.

回答1:

Most of them have not been introduced in LLVM/Clang, but were inherited from GCC. Therefore, searching for gcc preprocessor directives may lead to better results. The following document could give you some hints, but it does not seem to be complete (missing some of the above mentioned pragmas) nor is it specific to Objective-C:

http://gcc.gnu.org/onlinedocs/cpp/index.html#Top

This index may be faster to browse:

http://gcc.gnu.org/onlinedocs/cpp/Index-of-Directives.html#Index-of-Directives

回答2:

Interfaces & Implementation

@interface...@end
@implementation...@end
@class

Instance Variable Visibility

@public
@package
@protected
@private

Properties

@property
@synthesize
@dynamic

Protocols

@protocol
@required
@optional

Exception Handling

@try
@catch
@finally
@throw

Object Literals

@""
@42, @3.14, @YES, @'Z'
@[]
@{}
@()

Objective-C Literals

@selector()
@protocol()

C Literals

@encode()
@defs()

Optimizations

@autoreleasepool{}
@synchronized{}

Compatibility

@compatibility_alias

Taken from the following link which has an exhaustive list of directives with descriptions: NSHipster - @ Compiler Directives.