74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2010-2018 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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namespace cruft::iterator {
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///////////////////////////////////////////////////////////////////////////
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template <typename ContainerT>
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class indices {
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public:
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using value_type = std::size_t;
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indices (const ContainerT &_container):
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m_container (_container)
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{ ; }
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class iterator {
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public:
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using iterator_category = std::forward_iterator_tag;
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iterator (value_type _index):
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m_index (_index)
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{ ; }
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bool
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operator!= (const iterator &rhs) const
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{
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return m_index != rhs.m_index;
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}
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bool
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operator== (const iterator &rhs) const
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{
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return m_index == rhs.m_index;
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}
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iterator&
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operator++ (void) &
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{
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++m_index;
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return *this;
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};
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const value_type&
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operator* (void) const&
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{
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return m_index;
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}
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private:
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value_type m_index;
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};
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iterator begin (void) const { return iterator { value_type {0} }; }
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iterator end (void) const { return iterator { m_container.size () }; }
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constexpr auto size (void) const noexcept
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{
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return std::size (m_container);
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}
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private:
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const ContainerT &m_container;
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};
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template <typename ContainerT>
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indices (ContainerT const&) -> indices<ContainerT>;
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}
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