| // Copyright 2022 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 <cstddef> |
| #include <iterator> |
| #include <utility> |
| |
| namespace pw::containers::internal_algorithm { |
| |
| // The type of the iterator given by begin(c) (possibly std::begin(c)). |
| // ContainerIter<const vector<T>> gives vector<T>::const_iterator, |
| // while ContainerIter<vector<T>> gives vector<T>::iterator. |
| template <typename C> |
| using ContainerIter = decltype(std::begin(std::declval<C&>())); |
| |
| // An MSVC bug involving template parameter substitution requires us to use |
| // decltype() here instead of just std::pair. |
| template <typename C1, typename C2> |
| using ContainerIterPairType = |
| decltype(std::make_pair(ContainerIter<C1>(), ContainerIter<C2>())); |
| |
| template <typename C> |
| using ContainerDifferenceType = decltype(std::distance( |
| std::declval<ContainerIter<C>>(), std::declval<ContainerIter<C>>())); |
| |
| } // namespace pw::containers::internal_algorithm |
