Jorge Canizales | e8304d5 | 2015-02-17 19:50:51 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | * Copyright 2015 gRPC authors. |
Jorge Canizales | e8304d5 | 2015-02-17 19:50:51 -0800 | [diff] [blame] | 4 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 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 |
Jorge Canizales | e8304d5 | 2015-02-17 19:50:51 -0800 | [diff] [blame] | 8 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
Jorge Canizales | e8304d5 | 2015-02-17 19:50:51 -0800 | [diff] [blame] | 10 | * |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 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. |
Jorge Canizales | e8304d5 | 2015-02-17 19:50:51 -0800 | [diff] [blame] | 16 | * |
| 17 | */ |
| 18 | |
Jorge Canizales | 30697c9 | 2015-02-17 17:09:14 -0800 | [diff] [blame] | 19 | #import <Foundation/Foundation.h> |
| 20 | |
| 21 | @interface NSEnumerator (GRXUtil) |
| 22 | |
Jorge Canizales | b10776c | 2015-10-26 10:44:55 -0700 | [diff] [blame] | 23 | /** |
| 24 | * Returns a NSEnumerator instance that iterates through the elements of the passed container that |
| 25 | * supports fast enumeration. Note that this negates the speed benefits of fast enumeration over |
| 26 | * NSEnumerator. It's only intended for the rare cases when one needs the latter and only has the |
| 27 | * former, e.g. for iteration that needs to be paused and resumed later. |
| 28 | */ |
Jorge Canizales | 30697c9 | 2015-02-17 17:09:14 -0800 | [diff] [blame] | 29 | + (NSEnumerator *)grx_enumeratorWithContainer:(id<NSFastEnumeration>)container; |
| 30 | |
Jorge Canizales | b10776c | 2015-10-26 10:44:55 -0700 | [diff] [blame] | 31 | /** |
| 32 | * Returns a NSEnumerator instance that provides a single object before finishing. The value is then |
| 33 | * released. |
| 34 | */ |
Jorge Canizales | 30697c9 | 2015-02-17 17:09:14 -0800 | [diff] [blame] | 35 | + (NSEnumerator *)grx_enumeratorWithSingleValue:(id)value; |
| 36 | |
Jorge Canizales | b10776c | 2015-10-26 10:44:55 -0700 | [diff] [blame] | 37 | /** |
| 38 | * Returns a NSEnumerator instance that delegates the invocations of nextObject to the passed block. |
| 39 | * When the block first returns nil, it is released. |
| 40 | */ |
Jorge Canizales | 30697c9 | 2015-02-17 17:09:14 -0800 | [diff] [blame] | 41 | + (NSEnumerator *)grx_enumeratorWithValueSupplier:(id (^)())block; |
| 42 | @end |