86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
#pragma once
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/*
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_ITERATOR_FLATTEN_H
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#define BLT_ITERATOR_FLATTEN_H
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#include <blt/iterator/common.h>
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#include <tuple>
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namespace blt::iterator
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{
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namespace detail
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{
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template<typename T>
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struct make_tuple
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{
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using type = std::tuple<T>;
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static auto convert(T& f)
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{
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return std::forward_as_tuple(f);
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}
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static auto convert(T&& f)
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{
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return std::forward_as_tuple(f);
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}
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};
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template<typename... Args>
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struct make_tuple<std::tuple<Args...>>
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{
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using type = std::tuple<Args...>;
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static std::tuple<Args...>& convert(std::tuple<Args...>& lvalue)
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{
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return lvalue;
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}
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static std::tuple<Args...>&& convert(std::tuple<Args...>&& rvalue)
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{
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return rvalue;
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}
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};
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}
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template <typename Iter>
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class flatten_wrapper : public deref_only_wrapper<Iter, flatten_wrapper<Iter>>
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{
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public:
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using iterator_category = typename std::iterator_traits<Iter>::iterator_category;
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// using value_type = std::invoke_result_t<Func, meta::deref_return_t<Iter>>;
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using difference_type = ptrdiff_t;
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// using pointer = value_type;
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// using reference = value_type;
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explicit flatten_wrapper(Iter iter):
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deref_only_wrapper<Iter, flatten_wrapper<Iter>>(std::move(iter))
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{
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}
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reference operator*() const
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{
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return func(*this->iter);
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}
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};
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}
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#endif //BLT_ITERATOR_FLATTEN_H
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