| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #import "GRXNSBlockEnumerator.h" |
| |
| @implementation GRXNSBlockEnumerator { |
| id (^_block)(void); |
| } |
| |
| - (instancetype)init { |
| return [self initWithValueSupplier:nil]; |
| } |
| |
| - (instancetype)initWithValueSupplier:(id (^)(void))block { |
| if ((self = [super init])) { |
| _block = block; |
| } |
| return self; |
| } |
| |
| - (id)nextObject { |
| if (!_block) { |
| return nil; |
| } |
| id value = _block(); |
| if (!value) { |
| _block = nil; |
| } |
| return value; |
| } |
| @end |