fe0bba96ac
Change-Id: I5bcc4f8686c1ce5bf7def948ce50837fa542786f Reviewed-on: https://gerrit.libreoffice.org/25394 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
110 lines
3.7 KiB
C++
110 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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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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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_O3TL_ENUMARRAY_HXX
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#define INCLUDED_O3TL_ENUMARRAY_HXX
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#include <iterator>
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#include <type_traits>
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#include <cassert>
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namespace o3tl {
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template<typename EA>
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class enumarray_iterator;
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///
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/// This is a container convenience class for arrays indexed by enum values.
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///
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/// This assumes that the 'enum class' definition
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/// - starts at zero
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/// - has no holes in its sequence of values
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/// - defines a value called LAST which refers to the greatest constant.
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///
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/// \param E the 'enum class' type.
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/// \param V the value type to be stored in the array
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template<typename E, typename V>
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class enumarray final
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{
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public:
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typedef enumarray<E, V> self_type;
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typedef enumarray_iterator<self_type> iterator;
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typedef V value_type;
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typedef E key_type;
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typedef size_t size_type;
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static const size_type max_index = static_cast<size_type>(E::LAST);
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const V& operator[](E index) const
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{
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assert(index>=static_cast<E>(0) && index<=E::LAST);
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return detail_values[static_cast<size_type>(index)];
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}
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V& operator[](E index)
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{
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assert(index>=static_cast<E>(0) && index<=E::LAST);
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return detail_values[static_cast<size_type>(index)];
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}
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void fill(V val)
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{ for (size_type i=0; i<=max_index; ++i) detail_values[i] = val; }
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static size_type size() { return max_index + 1; }
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iterator begin() { return iterator(*this, 0); }
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iterator end() { return iterator(*this, size()); }
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V* data() { return detail_values; }
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//private:
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V detail_values[max_index + 1];
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};
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template<typename EA>
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class enumarray_iterator {
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EA *m_buf;
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size_t m_pos;
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public:
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typedef enumarray_iterator<EA> self_type;
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typedef typename EA::value_type value_type;
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typedef typename EA::key_type key_type;
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typedef std::bidirectional_iterator_tag iterator_category; //should be random access, but that would require define subtraction operators on the enums
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typedef
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typename std::make_signed<
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typename std::underlying_type<typename EA::key_type>::type>::type
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difference_type;
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typedef typename EA::value_type* pointer;
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typedef typename EA::value_type& reference;
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enumarray_iterator(EA& b, size_t start_pos)
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: m_buf(&b), m_pos(start_pos) {}
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value_type &operator*() { return (*m_buf)[static_cast<key_type>(m_pos)]; }
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value_type *operator->() { return &(operator*()); }
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self_type &operator++() { ++m_pos; return *this; }
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bool operator!=(const self_type& other) const { return m_buf != other.m_buf || m_pos != other.m_pos; }
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bool operator==(const self_type& other) const { return m_buf == other.m_buf && m_pos == other.m_pos; }
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};
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}; // namespace o3tl
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#endif /* INCLUDED_O3TL_ENUMARRAY_HXX */
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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