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Diffstat (limited to 'third_party/abseil_cpp/absl/algorithm/algorithm.h')
| -rw-r--r-- | third_party/abseil_cpp/absl/algorithm/algorithm.h | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/third_party/abseil_cpp/absl/algorithm/algorithm.h b/third_party/abseil_cpp/absl/algorithm/algorithm.h deleted file mode 100644 index e9b4733872..0000000000 --- a/third_party/abseil_cpp/absl/algorithm/algorithm.h +++ /dev/null @@ -1,159 +0,0 @@ -// Copyright 2017 The Abseil 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 -// -// https://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. -// -// ----------------------------------------------------------------------------- -// File: algorithm.h -// ----------------------------------------------------------------------------- -// -// This header file contains Google extensions to the standard <algorithm> C++ -// header. - -#ifndef ABSL_ALGORITHM_ALGORITHM_H_ -#define ABSL_ALGORITHM_ALGORITHM_H_ - -#include <algorithm> -#include <iterator> -#include <type_traits> - -#include "absl/base/config.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -namespace algorithm_internal { - -// Performs comparisons with operator==, similar to C++14's `std::equal_to<>`. -struct EqualTo { - template <typename T, typename U> - bool operator()(const T& a, const U& b) const { - return a == b; - } -}; - -template <typename InputIter1, typename InputIter2, typename Pred> -bool EqualImpl(InputIter1 first1, InputIter1 last1, InputIter2 first2, - InputIter2 last2, Pred pred, std::input_iterator_tag, - std::input_iterator_tag) { - while (true) { - if (first1 == last1) return first2 == last2; - if (first2 == last2) return false; - if (!pred(*first1, *first2)) return false; - ++first1; - ++first2; - } -} - -template <typename InputIter1, typename InputIter2, typename Pred> -bool EqualImpl(InputIter1 first1, InputIter1 last1, InputIter2 first2, - InputIter2 last2, Pred&& pred, std::random_access_iterator_tag, - std::random_access_iterator_tag) { - return (last1 - first1 == last2 - first2) && - std::equal(first1, last1, first2, std::forward<Pred>(pred)); -} - -// When we are using our own internal predicate that just applies operator==, we -// forward to the non-predicate form of std::equal. This enables an optimization -// in libstdc++ that can result in std::memcmp being used for integer types. -template <typename InputIter1, typename InputIter2> -bool EqualImpl(InputIter1 first1, InputIter1 last1, InputIter2 first2, - InputIter2 last2, algorithm_internal::EqualTo /* unused */, - std::random_access_iterator_tag, - std::random_access_iterator_tag) { - return (last1 - first1 == last2 - first2) && - std::equal(first1, last1, first2); -} - -template <typename It> -It RotateImpl(It first, It middle, It last, std::true_type) { - return std::rotate(first, middle, last); -} - -template <typename It> -It RotateImpl(It first, It middle, It last, std::false_type) { - std::rotate(first, middle, last); - return std::next(first, std::distance(middle, last)); -} - -} // namespace algorithm_internal - -// equal() -// -// Compares the equality of two ranges specified by pairs of iterators, using -// the given predicate, returning true iff for each corresponding iterator i1 -// and i2 in the first and second range respectively, pred(*i1, *i2) == true -// -// This comparison takes at most min(`last1` - `first1`, `last2` - `first2`) -// invocations of the predicate. Additionally, if InputIter1 and InputIter2 are -// both random-access iterators, and `last1` - `first1` != `last2` - `first2`, -// then the predicate is never invoked and the function returns false. -// -// This is a C++11-compatible implementation of C++14 `std::equal`. See -// https://en.cppreference.com/w/cpp/algorithm/equal for more information. -template <typename InputIter1, typename InputIter2, typename Pred> -bool equal(InputIter1 first1, InputIter1 last1, InputIter2 first2, - InputIter2 last2, Pred&& pred) { - return algorithm_internal::EqualImpl( - first1, last1, first2, last2, std::forward<Pred>(pred), - typename std::iterator_traits<InputIter1>::iterator_category{}, - typename std::iterator_traits<InputIter2>::iterator_category{}); -} - -// Overload of equal() that performs comparison of two ranges specified by pairs -// of iterators using operator==. -template <typename InputIter1, typename InputIter2> -bool equal(InputIter1 first1, InputIter1 last1, InputIter2 first2, - InputIter2 last2) { - return absl::equal(first1, last1, first2, last2, - algorithm_internal::EqualTo{}); -} - -// linear_search() -// -// Performs a linear search for `value` using the iterator `first` up to -// but not including `last`, returning true if [`first`, `last`) contains an -// element equal to `value`. -// -// A linear search is of O(n) complexity which is guaranteed to make at most -// n = (`last` - `first`) comparisons. A linear search over short containers -// may be faster than a binary search, even when the container is sorted. -template <typename InputIterator, typename EqualityComparable> -bool linear_search(InputIterator first, InputIterator last, - const EqualityComparable& value) { - return std::find(first, last, value) != last; -} - -// rotate() -// -// Performs a left rotation on a range of elements (`first`, `last`) such that -// `middle` is now the first element. `rotate()` returns an iterator pointing to -// the first element before rotation. This function is exactly the same as -// `std::rotate`, but fixes a bug in gcc -// <= 4.9 where `std::rotate` returns `void` instead of an iterator. -// -// The complexity of this algorithm is the same as that of `std::rotate`, but if -// `ForwardIterator` is not a random-access iterator, then `absl::rotate` -// performs an additional pass over the range to construct the return value. -template <typename ForwardIterator> -ForwardIterator rotate(ForwardIterator first, ForwardIterator middle, - ForwardIterator last) { - return algorithm_internal::RotateImpl( - first, middle, last, - std::is_same<decltype(std::rotate(first, middle, last)), - ForwardIterator>()); -} - -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_ALGORITHM_ALGORITHM_H_ |