#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // We'll use @throw throughout this site to check for
        // unexpected errors. This is the only program on the
        // site designed to throw an exception.
        @throw [NSException exceptionWithName:@"CustomException"
                                       reason:@"a problem"
                                     userInfo:nil];
        
        // A common use of @throw is to abort if a function
        // returns an error value that we don't know how to
        // (or want to) handle. Here's an example of
        // throwing an exception if we get an unexpected error when creating a new file.
        NSError *error;
        BOOL success = [@"Hello, World!" writeToFile:@"/tmp/file"
                                          atomically:YES
                                            encoding:NSUTF8StringEncoding
                                               error:&error];
        if (!success) {
            @throw error;
        }
    }
    return 0;
}