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//
// GTMNSEnumerator+Filter.h
//
// Copyright 2007-2008 Google Inc.
//
// 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>
/// A generic category for methods that allow us to filter enumeratable
/// containers, inspired by C++ Standard Library's use of iterators.
/// Like in C++, these assume the underlying container is not modified during
/// the lifetime of the iterator.
///
@interface NSEnumerator (GTMEnumeratorFilterAdditions)
/// @argument predicate - the function return BOOL. will be applied to each element
/// @argument argument - optional argument to pass to predicate
/// @returns an enumerator that contains only elements where [element sel:argument] is true
- (NSEnumerator *)gtm_filteredEnumeratorByMakingEachObjectPerformSelector:(SEL)predicate
withObject:(id)argument;
/// @argument selector - the function return a transformed object. will be applied to each element
/// @argument argument - optional argument to pass to transformer
/// @returns an enumerator that contains the transformed elements
- (NSEnumerator *)gtm_enumeratorByMakingEachObjectPerformSelector:(SEL)selector
withObject:(id)argument;
/// @argument target - receiver for each method
/// @argument predicate - as in, [target predicate: [self nextObject]], return a BOOL
/// @returns an enumerator that contains only elements where [element sel:argument] is true
- (NSEnumerator *)gtm_filteredEnumeratorByTarget:(id)target
performOnEachSelector:(SEL)predicate;
/// @argument target - receiver for each method
/// @argument sel - as in, [target selector: [self nextObject]], return a transformed object
/// @returns an enumerator that contains the transformed elements
- (NSEnumerator *)gtm_enumeratorByTarget:(id)target
performOnEachSelector:(SEL)selector;
@end
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