NSArray+TupleAssignment.h

#import <Cocoa/Cocoa.h>


#define k_NSArrayTupleAssignment @"THISISAMAGICVALUELOL"
#define _(...) [NSArray arrayOfPointerValues:(void *)__VA_ARGS__, NULL][k_NSArrayTupleAssignment]


@interface NSArray (TupleAssignment)

+ (instancetype)arrayOfPointerValues:(void *)pointer1, ...;

- (id)objectForKeyedSubscript:(id<NSCopying>)key;
- (void)setObject:(id)object forKeyedSubscript:(id<NSCopying>)key;

@end

NSArray+TupleAssignment.m

#import "NSArray+TupleAssignment.h"


@implementation NSArray (TupleAssignment)

+ (instancetype)arrayOfPointerValues:(void *)pointer1, ...
{
    NSMutableArray * newArray;
    if (!(newArray = [NSMutableArray array])) return nil;
    
    va_list args;
    va_start(args, pointer1);
    
    NSUInteger index = 0;
    void * currentPointer = pointer1;
    while (currentPointer) {
        newArray[index] = [NSValue valueWithPointer:currentPointer];
        currentPointer = va_arg(args, id __unsafe_unretained *);
        ++index;
    }
    
    va_end(args);
    
    return [newArray copy];
}

- (id)objectForKeyedSubscript:(id<NSCopying>)key
{
    if (![(NSString *)key isEqualToString:k_NSArrayTupleAssignment]) return nil;
    
    NSMutableArray * properArray = [NSMutableArray array];
    for (NSUInteger i = 0; i < self.count; ++i) {
        properArray[i] = (__bridge id)[self[i] pointerValue];
    }
    return properArray;
}

- (void)setObject:(id)object forKeyedSubscript:(id<NSCopying>)key
{
    if (![(NSString *)key isEqualToString:k_NSArrayTupleAssignment]) return;
    
    NSArray * values = (NSArray *)object;
    
    for (NSUInteger i = 0; i < [values count]; ++i) {
        id __unsafe_unretained * currentPointer = (id __unsafe_unretained *)[(NSValue *)self[i] pointerValue];
        *currentPointer = values[i];
    }
}

@end