#import "ViewController.h"
@interface Person : NSObject
@property (nonatomic, assign) NSInteger identifier;
@property (nonatomic, copy) NSString *name;
@end
@implementation Person
- (NSString *)description
{
return [NSString stringWithFormat:@"<%p, name:%@, identifier:%d>", self, self.name, (int)self.identifier];
}
@end
@interface ViewController ()
@property (nonatomic, strong) NSHashTable<Person *> *hashTable;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSPointerFunctions *f = [NSPointerFunctions pointerFunctionsWithOptions:NSPointerFunctionsStrongMemory];
[f setHashFunction:hashFunction];
[f setIsEqualFunction:isEqualFunction];
self.hashTable = [[NSHashTable alloc] initWithPointerFunctions:f capacity:5];
for (int index = 0; index < 100; index++) {
Person *person = [[Person alloc] init];
person.name = [NSString stringWithFormat:@"name_%d", index];
person.identifier = arc4random() % 5;
[self.hashTable addObject:person];
}
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
NSLog(@"%@", self.hashTable);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
NSUInteger hashFunction(const void *item, NSUInteger (* _Nullable size)(const void *item)) {
return [(__bridge Person *)item identifier];
}
BOOL isEqualFunction(const void *item1, const void*item2, NSUInteger (* _Nullable size)(const void *item)) {
return [(__bridge Person *)item1 identifier] == [(__bridge Person *)item2 identifier];
}
@end