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66 lines
1.3 KiB
C++
66 lines
1.3 KiB
C++
/*
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* Copyright (c) 2024, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/StdLibExtras.h>
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namespace AK {
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namespace Detail {
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template<typename Iterable>
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class Enumerator {
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using IteratorType = decltype(declval<Iterable>().begin());
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using ValueType = decltype(*declval<IteratorType>());
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struct Enumeration {
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size_t index { 0 };
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ValueType value;
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};
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public:
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Enumerator(Iterable&& iterable)
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: m_iterable(forward<Iterable>(iterable))
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, m_iterator(m_iterable.begin())
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, m_end(m_iterable.end())
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{
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}
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Enumerator const& begin() const { return *this; }
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Enumerator const& end() const { return *this; }
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Enumeration operator*() { return { m_index, *m_iterator }; }
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Enumeration operator*() const { return { m_index, *m_iterator }; }
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bool operator!=(Enumerator const&) const { return m_iterator != m_end; }
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void operator++()
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{
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++m_index;
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++m_iterator;
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}
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private:
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Iterable m_iterable;
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size_t m_index { 0 };
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IteratorType m_iterator;
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IteratorType const m_end;
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};
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}
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template<typename T>
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auto enumerate(T&& range)
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{
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return Detail::Enumerator<T> { forward<T>(range) };
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}
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}
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#ifdef USING_AK_GLOBALLY
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using AK::enumerate;
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#endif
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