| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef MOZC_BASE_STL_UTIL_H_ |
| #define MOZC_BASE_STL_UTIL_H_ |
| |
| #include <functional> |
| |
| #include "base/port.h" |
| |
| namespace mozc { |
| |
| template <class ForwardIterator> |
| void STLDeleteContainerPointers(ForwardIterator begin, |
| ForwardIterator end) { |
| while (begin != end) { |
| ForwardIterator temp = begin; |
| ++begin; |
| delete *temp; |
| } |
| } |
| |
| template <class T> |
| void STLDeleteElements(T *container) { |
| if (!container) { |
| return; |
| } |
| STLDeleteContainerPointers(container->begin(), container->end()); |
| container->clear(); |
| } |
| |
| template <typename C> |
| class ScopedElementsDeleter { |
| public: |
| explicit ScopedElementsDeleter(C *container) : container_(container) {} |
| ~ScopedElementsDeleter() { STLDeleteElements(container_); } |
| |
| private: |
| C *container_; |
| DISALLOW_COPY_AND_ASSIGN(ScopedElementsDeleter); |
| }; |
| |
| // Comparator functor based of a member. |
| // Key: a function object to return key from the given value. |
| // Comparator: a base comparator function object. |
| template <typename Key, typename Comparator> |
| class OrderBy { |
| public: |
| OrderBy() { |
| } |
| |
| OrderBy(const Key &key, const Comparator &comparator) |
| : key_(key), comparator_(comparator) { |
| } |
| |
| template<typename T> |
| bool operator()(const T &lhs, const T &rhs) const { |
| return comparator_(key_(lhs), key_(rhs)); |
| } |
| |
| private: |
| Key key_; |
| Comparator comparator_; |
| }; |
| |
| // Function object to return pair<T1, T2>::first. |
| struct FirstKey { |
| template<typename T> |
| const typename T::first_type &operator()(const T &value) const { |
| return value.first; |
| } |
| }; |
| |
| // Function object to return pair<T1, T2>::second. |
| struct SecondKey { |
| template<typename T> |
| const typename T::second_type &operator()(const T &value) const { |
| return value.second; |
| } |
| }; |
| |
| // Simple wrapper of binary predicator in functional. |
| template<template<typename T> class Comparator> |
| struct FunctionalComparator { |
| template<typename T> |
| bool operator()(const T &lhs, const T &rhs) const { |
| return Comparator<T>()(lhs, rhs); |
| } |
| }; |
| typedef FunctionalComparator<equal_to> EqualTo; |
| typedef FunctionalComparator<not_equal_to> NotEqualTo; |
| typedef FunctionalComparator<less> Less; |
| typedef FunctionalComparator<greater> Greater; |
| typedef FunctionalComparator<less_equal> LessEqual; |
| typedef FunctionalComparator<greater_equal> GreaterEqual; |
| |
| } // namespace mozc |
| |
| #endif // MOZC_BASE_STL_UTIL_H_ |