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submodules/MtProtoKit/Sources/Utils/MTQueueLocalObject.m

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+#import "MTQueueLocalObject.h"
+#import <MtProtoKit/MTQueue.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MTQueueLocalObjectHolder : NSObject
+
+@property (nonatomic, assign) CFTypeRef impl;
+
+@end
+
+@implementation MTQueueLocalObjectHolder
+
+@end
+
+@interface MTQueueLocalObject () {
+    MTQueue *_queue;
+    MTQueueLocalObjectHolder *_holder;
+}
+
+@end
+
+@implementation MTQueueLocalObject
+
+- (instancetype)initWithQueue:(MTQueue *)queue generator:(id(^)())generator {
+    self = [super init];
+    if (self != nil) {
+        _queue = queue;
+        _holder = [[MTQueueLocalObjectHolder alloc] init];
+        __auto_type holder = _holder;
+        [queue dispatchOnQueue:^{
+            id value = generator();
+            holder.impl = CFBridgingRetain(value);
+        } synchronous:false];
+    }
+    return self;
+}
+
+- (void)dealloc {
+    __auto_type holder = _holder;
+    [_queue dispatchOnQueue:^{
+        CFBridgingRelease(holder.impl);
+    } synchronous:false];
+}
+
+- (void)with:(void (^)(id))f {
+    __auto_type holder = _holder;
+    [_queue dispatchOnQueue:^{
+        id value = (__bridge id)holder.impl;
+        f(value);
+    } synchronous:false];
+}
+
+@end
+
+NS_ASSUME_NONNULL_END