#import <Foundation/Foundation.h>

@interface StackClass<T:id<CustomAddProtocol>> : NSObject
@property (nonatomic,retain) NSMutableArray *items;
- (void)push:(T)value;
- (T)pop;
@end


#import "StackClass.h"

@implementation StackClass
- (instancetype)init {
    self = [super init];
    self.items = [[NSMutableArray alloc]init];
    return self;
}

- (void)push:(id)value {
    [self.items addObject:value];
}

- (id)pop {
    id last = [self.items lastObject];
    [self.items removeLastObject];
    return last;
}

@end