Jump through an IMP

imp.m

#import <Foundation/Foundation.h>

// Call a method through a cached IMP pointer.

// clang -g -Wall -framework Foundation -o imp imp.m

id (*uppercase)(id, SEL, ...);

int main (void) {
    @autoreleasepool {
        
        NSString *string = @"Bork";
        uppercase = [string methodForSelector: @selector(uppercaseString)];
        
        NSString *upcase = uppercase (string, @selector(flonknozzle));
        NSLog (@"%@ -> %@", string, upcase);
        
    }
    return 0;
    
} // main