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/*
*
* 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 <Foundation/Foundation.h>
@interface NSEnumerator (GRXUtil)
/**
* Returns a NSEnumerator instance that iterates through the elements of the passed container that
* supports fast enumeration. Note that this negates the speed benefits of fast enumeration over
* NSEnumerator. It's only intended for the rare cases when one needs the latter and only has the
* former, e.g. for iteration that needs to be paused and resumed later.
*/
+ (NSEnumerator *)grx_enumeratorWithContainer:(id<NSFastEnumeration>)container;
/**
* Returns a NSEnumerator instance that provides a single object before finishing. The value is then
* released.
*/
+ (NSEnumerator *)grx_enumeratorWithSingleValue:(id)value;
/**
* Returns a NSEnumerator instance that delegates the invocations of nextObject to the passed block.
* When the block first returns nil, it is released.
*/
+ (NSEnumerator *)grx_enumeratorWithValueSupplier:(id (^)(void))block;
@end
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