1/* 2 * 3 * Copyright 2015 gRPC authors. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 19#import "GRXNSBlockEnumerator.h" 20 21@implementation GRXNSBlockEnumerator { 22 id (^_block)(void); 23} 24 25- (instancetype)init { 26 return [self initWithValueSupplier:nil]; 27} 28 29- (instancetype)initWithValueSupplier:(id (^)(void))block { 30 if ((self = [super init])) { 31 _block = block; 32 } 33 return self; 34} 35 36- (id)nextObject { 37 if (!_block) { 38 return nil; 39 } 40 id value = _block(); 41 if (!value) { 42 _block = nil; 43 } 44 return value; 45} 46@end 47