358 lines
13 KiB
C++
358 lines
13 KiB
C++
/*
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* Frozen
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* Copyright 2016 QuarksLab
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*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#ifndef FROZEN_LETITGO_MAP_H
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#define FROZEN_LETITGO_MAP_H
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#include "frozen/bits/algorithms.h"
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#include "frozen/bits/basic_types.h"
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#include "frozen/bits/constexpr_assert.h"
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#include "frozen/bits/exceptions.h"
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#include "frozen/bits/mpl.h"
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#include "frozen/bits/version.h"
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#include <iterator>
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#include <utility>
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namespace frozen {
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namespace impl {
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template <class Comparator> class CompareKey : private Comparator {
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public:
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constexpr Comparator const& key_comp() const noexcept {
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return static_cast<Comparator const&>(*this);
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}
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constexpr CompareKey(Comparator const &comparator)
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: Comparator(comparator) {}
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template <class Key1, class Key2, class Value>
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constexpr int operator()(std::pair<Key1, Value> const &self,
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std::pair<Key2, Value> const &other) const {
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return key_comp()(std::get<0>(self), std::get<0>(other));
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}
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template <class Key1, class Key2, class Value>
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constexpr int operator()(Key1 const &self_key,
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std::pair<Key2, Value> const &other) const {
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return key_comp()(self_key, std::get<0>(other));
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}
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template <class Key1, class Key2, class Value>
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constexpr int operator()(std::pair<Key1, Value> const &self,
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Key2 const &other_key) const {
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return key_comp()(std::get<0>(self), other_key);
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}
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template <class Key1, class Key2>
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constexpr int operator()(Key1 const &self_key, Key2 const &other_key) const {
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return key_comp()(self_key, other_key);
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}
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};
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} // namespace impl
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template <class Key, class Value, std::size_t N, class Compare = std::less<Key>>
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class map : private impl::CompareKey<Compare> {
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using container_type = bits::carray<std::pair<const Key, Value>, N>;
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container_type items_;
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public:
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using key_type = Key;
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using mapped_type = Value;
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using value_type = typename container_type::value_type;
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using size_type = typename container_type::size_type;
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using difference_type = typename container_type::difference_type;
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using key_compare = Compare;
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using value_compare = impl::CompareKey<Compare>;
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using reference = typename container_type::reference;
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using const_reference = typename container_type::const_reference;
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using pointer = typename container_type::pointer;
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using const_pointer = typename container_type::const_pointer;
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using iterator = typename container_type::iterator;
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using const_iterator = typename container_type::const_iterator;
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using reverse_iterator = std::reverse_iterator<iterator>;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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public:
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/* constructors */
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constexpr map(container_type items, Compare const &compare)
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: impl::CompareKey<Compare>{compare}
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, items_{bits::quicksort(bits::remove_cv_t<container_type>(items), value_comp())} {}
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explicit constexpr map(container_type items)
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: map{items, Compare{}} {}
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constexpr map(std::initializer_list<value_type> items, Compare const &compare)
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: map{container_type {items}, compare} {
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constexpr_assert(items.size() == N, "Inconsistent initializer_list size and type size argument");
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}
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constexpr map(std::initializer_list<value_type> items)
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: map{items, Compare{}} {}
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/* element access */
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constexpr Value const& at(Key const &key) const {
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return at_impl(*this, key);
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}
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constexpr Value& at(Key const &key) {
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return at_impl(*this, key);
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}
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/* iterators */
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constexpr iterator begin() { return items_.begin(); }
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constexpr const_iterator begin() const { return items_.begin(); }
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constexpr const_iterator cbegin() const { return items_.begin(); }
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constexpr iterator end() { return items_.end(); }
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constexpr const_iterator end() const { return items_.end(); }
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constexpr const_iterator cend() const { return items_.end(); }
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constexpr reverse_iterator rbegin() { return reverse_iterator{items_.end()}; }
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constexpr const_reverse_iterator rbegin() const { return const_reverse_iterator{items_.end()}; }
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constexpr const_reverse_iterator crbegin() const { return const_reverse_iterator{items_.end()}; }
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constexpr reverse_iterator rend() { return reverse_iterator{items_.begin()}; }
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constexpr const_reverse_iterator rend() const { return const_reverse_iterator{items_.begin()}; }
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constexpr const_reverse_iterator crend() const { return const_reverse_iterator{items_.begin()}; }
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/* capacity */
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constexpr bool empty() const { return !N; }
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constexpr size_type size() const { return N; }
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constexpr size_type max_size() const { return N; }
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/* lookup */
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template <class KeyType>
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constexpr std::size_t count(KeyType const &key) const {
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return bits::binary_search<N>(items_.begin(), key, value_comp());
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}
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template <class KeyType>
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constexpr const_iterator find(KeyType const &key) const {
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return map::find_impl(*this, key);
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}
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template <class KeyType>
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constexpr iterator find(KeyType const &key) {
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return map::find_impl(*this, key);
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}
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template <class KeyType>
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constexpr bool contains(KeyType const &key) const {
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return this->find(key) != this->end();
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}
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template <class KeyType>
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constexpr std::pair<const_iterator, const_iterator>
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equal_range(KeyType const &key) const {
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return equal_range_impl(*this, key);
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}
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template <class KeyType>
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constexpr std::pair<iterator, iterator> equal_range(KeyType const &key) {
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return equal_range_impl(*this, key);
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}
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template <class KeyType>
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constexpr const_iterator lower_bound(KeyType const &key) const {
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return lower_bound_impl(*this, key);
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}
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template <class KeyType>
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constexpr iterator lower_bound(KeyType const &key) {
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return lower_bound_impl(*this, key);
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}
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template <class KeyType>
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constexpr const_iterator upper_bound(KeyType const &key) const {
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return upper_bound_impl(*this, key);
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}
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template <class KeyType>
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constexpr iterator upper_bound(KeyType const &key) {
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return upper_bound_impl(*this, key);
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}
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/* observers */
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constexpr const key_compare& key_comp() const { return value_comp().key_comp(); }
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constexpr const value_compare& value_comp() const { return static_cast<impl::CompareKey<Compare> const&>(*this); }
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private:
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template <class This, class KeyType>
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static inline constexpr auto& at_impl(This&& self, KeyType const &key) {
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auto where = self.find(key);
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if (where != self.end())
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return where->second;
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else
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FROZEN_THROW_OR_ABORT(std::out_of_range("unknown key"));
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}
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template <class This, class KeyType>
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static inline constexpr auto find_impl(This&& self, KeyType const &key) {
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auto where = self.lower_bound(key);
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if (where != self.end() && !self.value_comp()(key, *where))
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return where;
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else
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return self.end();
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}
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template <class This, class KeyType>
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static inline constexpr auto equal_range_impl(This&& self, KeyType const &key) {
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auto lower = self.lower_bound(key);
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using lower_t = decltype(lower);
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if (lower != self.end() && !self.value_comp()(key, *lower))
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return std::pair<lower_t, lower_t>{lower, lower + 1};
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else
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return std::pair<lower_t, lower_t>{lower, lower};
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}
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template <class This, class KeyType>
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static inline constexpr auto lower_bound_impl(This&& self, KeyType const &key) -> decltype(self.end()) {
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return bits::lower_bound<N>(self.items_.begin(), key, self.value_comp());
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}
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template <class This, class KeyType>
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static inline constexpr auto upper_bound_impl(This&& self, KeyType const &key) {
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auto lower = self.lower_bound(key);
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if (lower != self.end() && !self.value_comp()(key, *lower))
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return lower + 1;
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else
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return lower;
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}
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};
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template <class Key, class Value, class Compare>
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class map<Key, Value, 0, Compare> : private impl::CompareKey<Compare> {
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using container_type = bits::carray<std::pair<Key, Value>, 0>;
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public:
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using key_type = Key;
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using mapped_type = Value;
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using value_type = typename container_type::value_type;
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using size_type = typename container_type::size_type;
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using difference_type = typename container_type::difference_type;
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using key_compare = Compare;
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using value_compare = impl::CompareKey<Compare>;
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using reference = typename container_type::reference;
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using const_reference = typename container_type::const_reference;
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using pointer = typename container_type::pointer;
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using const_pointer = typename container_type::const_pointer;
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using iterator = pointer;
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using const_iterator = const_pointer;
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using reverse_iterator = pointer;
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using const_reverse_iterator = const_pointer;
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public:
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/* constructors */
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constexpr map(const map &other) = default;
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constexpr map(std::initializer_list<value_type>, Compare const &compare)
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: impl::CompareKey<Compare>{compare} {}
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constexpr map(std::initializer_list<value_type> items)
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: map{items, Compare{}} {}
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/* element access */
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template <class KeyType>
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constexpr mapped_type at(KeyType const &) const {
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FROZEN_THROW_OR_ABORT(std::out_of_range("invalid key"));
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}
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template <class KeyType>
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constexpr mapped_type at(KeyType const &) {
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FROZEN_THROW_OR_ABORT(std::out_of_range("invalid key"));
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}
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/* iterators */
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constexpr iterator begin() { return nullptr; }
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constexpr const_iterator begin() const { return nullptr; }
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constexpr const_iterator cbegin() const { return nullptr; }
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constexpr iterator end() { return nullptr; }
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constexpr const_iterator end() const { return nullptr; }
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constexpr const_iterator cend() const { return nullptr; }
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constexpr reverse_iterator rbegin() { return nullptr; }
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constexpr const_reverse_iterator rbegin() const { return nullptr; }
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constexpr const_reverse_iterator crbegin() const { return nullptr; }
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constexpr reverse_iterator rend() { return nullptr; }
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constexpr const_reverse_iterator rend() const { return nullptr; }
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constexpr const_reverse_iterator crend() const { return nullptr; }
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/* capacity */
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constexpr bool empty() const { return true; }
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constexpr size_type size() const { return 0; }
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constexpr size_type max_size() const { return 0; }
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/* lookup */
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template <class KeyType>
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constexpr std::size_t count(KeyType const &) const { return 0; }
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template <class KeyType>
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constexpr const_iterator find(KeyType const &) const { return end(); }
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template <class KeyType>
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constexpr iterator find(KeyType const &) { return end(); }
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template <class KeyType>
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constexpr std::pair<const_iterator, const_iterator>
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equal_range(KeyType const &) const { return {end(), end()}; }
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template <class KeyType>
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constexpr std::pair<iterator, iterator>
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equal_range(KeyType const &) { return {end(), end()}; }
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template <class KeyType>
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constexpr const_iterator lower_bound(KeyType const &) const { return end(); }
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template <class KeyType>
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constexpr iterator lower_bound(KeyType const &) { return end(); }
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template <class KeyType>
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constexpr const_iterator upper_bound(KeyType const &) const { return end(); }
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template <class KeyType>
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constexpr iterator upper_bound(KeyType const &) { return end(); }
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/* observers */
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constexpr key_compare const& key_comp() const { return value_comp().key_comp(); }
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constexpr value_compare const& value_comp() const { return static_cast<impl::CompareKey<Compare> const&>(*this); }
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};
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template <typename T, typename U, typename Compare = std::less<T>>
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constexpr auto make_map(bits::ignored_arg = {}/* for consistency with the initializer below for N = 0*/) {
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return map<T, U, 0, Compare>{};
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}
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template <typename T, typename U, std::size_t N>
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constexpr auto make_map(std::pair<T, U> const (&items)[N]) {
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return map<T, U, N>{items};
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}
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template <typename T, typename U, std::size_t N>
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constexpr auto make_map(std::array<std::pair<T, U>, N> const &items) {
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return map<T, U, N>{items};
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}
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template <typename T, typename U, typename Compare, std::size_t N>
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constexpr auto make_map(std::pair<T, U> const (&items)[N], Compare const& compare = Compare{}) {
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return map<T, U, N, Compare>{items, compare};
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}
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template <typename T, typename U, typename Compare, std::size_t N>
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constexpr auto make_map(std::array<std::pair<T, U>, N> const &items, Compare const& compare = Compare{}) {
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return map<T, U, N, Compare>{items, compare};
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}
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} // namespace frozen
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#endif
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