| // Copyright 2020 The Pigweed 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. |
| #pragma once |
| |
| #include <type_traits> |
| |
| #include "pw_polyfill/standard_library/namespace.h" |
| |
| _PW_POLYFILL_BEGIN_NAMESPACE_STD |
| |
| template <class InputIterator, class OutputIterator> |
| constexpr OutputIterator copy(InputIterator first, |
| InputIterator last, |
| OutputIterator dest) { |
| while (first != last) { |
| *dest++ = *first++; |
| } |
| return dest; |
| } |
| |
| template <typename T> |
| constexpr const T& min(const T& lhs, const T& rhs) { |
| return (rhs < lhs) ? rhs : lhs; |
| } |
| |
| template <typename T> |
| constexpr const T& max(const T& lhs, const T& rhs) { |
| return (lhs < rhs) ? rhs : lhs; |
| } |
| |
| template <class InputIterator, typename T> |
| constexpr InputIterator find(InputIterator first, |
| InputIterator last, |
| const T& value) { |
| for (; first != last; ++first) { |
| if (*first == value) { |
| return first; |
| } |
| } |
| return last; |
| } |
| |
| template <typename T> |
| constexpr T&& forward(remove_reference_t<T>& value) { |
| return static_cast<T&&>(value); |
| } |
| |
| template <typename T> |
| constexpr T&& forward(remove_reference_t<T>&& value) { |
| return static_cast<T&&>(value); |
| } |
| |
| template <class LhsIterator, class RhsIterator> |
| constexpr bool equal(LhsIterator first_l, |
| LhsIterator last_l, |
| RhsIterator first_r, |
| RhsIterator last_r) { |
| while (first_l != last_l && first_r != last_r) { |
| if (*first_l != *first_r) { |
| return false; |
| } |
| ++first_l; |
| ++first_r; |
| } |
| return first_l == last_l && first_r == last_r; |
| } |
| |
| template <class LhsIterator, class RhsIterator> |
| constexpr bool lexicographical_compare(LhsIterator first_l, |
| LhsIterator last_l, |
| RhsIterator first_r, |
| RhsIterator last_r) { |
| while (first_l != last_l && first_r != last_r) { |
| if (*first_l < *first_r) { |
| return true; |
| } |
| if (*first_r < *first_l) { |
| return false; |
| } |
| |
| ++first_l; |
| ++first_r; |
| } |
| return (first_l == last_l) && (first_r != last_r); |
| } |
| |
| _PW_POLYFILL_END_NAMESPACE_STD |