File indexing completed on 2024-05-19 05:42:29

 // ct_lvtshr_iterator.h                                                                                        -*-C++-*-
 
 /*
 // Copyright 2023 Codethink Ltd <codethink@codethink.co.uk>
 // SPDX-License-Identifier: Apache-2.0
 //
 // 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.
 */
 
 #ifndef DIAGRAM_SERVER_CT_LVTSHR_ITERATOR_H
 #define DIAGRAM_SERVER_CT_LVTSHR_ITERATOR_H
 
 #include <iterator>
 #include <tuple>
 
 namespace Codethink::lvtshr {
 
 template<typename T,
          typename TIter = decltype(std::begin(std::declval<T>())),
          typename = decltype(std::end(std::declval<T>()))>
 constexpr auto enumerate(T&& iterable)
 {
     struct iterator {
         bool operator!=(const iterator& other) const
         {
             return iter != other.iter;
         }
 
         void operator++()
         {
             ++i;
             ++iter;
         }
 
         auto operator*() const
         {
             return std::tie(i, *iter);
         }
 
         std::size_t i;
         TIter iter;
     };
     struct enumerate_t {
         auto begin()
         {
             return iterator{0, std::begin(iterable)};
         }
 
         auto end()
         {
             return iterator{0, std::end(iterable)};
         }
 
         T iterable;
     };
     return enumerate_t{std::forward<T>(iterable)};
 }
 
 } // namespace Codethink::lvtshr
 
 #endif // DIAGRAM_SERVER_CT_LVTSHR_ITERATOR_H