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/*
* Frozen
* Copyright 2016 QuarksLab
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#ifndef FROZEN_LETITGO_UNORDERED_MAP_H
#define FROZEN_LETITGO_UNORDERED_MAP_H
#include "frozen/bits/basic_types.h"
#include "frozen/bits/constexpr_assert.h"
#include "frozen/bits/elsa.h"
#include "frozen/bits/exceptions.h"
#include "frozen/bits/pmh.h"
#include "frozen/bits/version.h"
#include "frozen/random.h"
#include <tuple>
#include <functional>
namespace frozen {
namespace bits {
struct GetKey {
template <class KV> constexpr auto const &operator()(KV const &kv) const {
return kv.first;
}
};
} // namespace bits
template <class Key, class Value, std::size_t N, typename Hash = anna<Key>,
class KeyEqual = std::equal_to<Key>>
class unordered_map {
static constexpr std::size_t storage_size =
bits::next_highest_power_of_two(N) * (N < 32 ? 2 : 1); // size adjustment to prevent high collision rate for small sets
using container_type = bits::carray<std::pair<Key, Value>, N>;
using tables_type = bits::pmh_tables<storage_size, Hash>;
KeyEqual const equal_;
container_type items_;
tables_type tables_;
public:
/* typedefs */
using Self = unordered_map<Key, Value, N, Hash, KeyEqual>;
using key_type = Key;
using mapped_type = Value;
using value_type = typename container_type::value_type;
using size_type = typename container_type::size_type;
using difference_type = typename container_type::difference_type;
using hasher = Hash;
using key_equal = KeyEqual;
using reference = typename container_type::reference;
using const_reference = typename container_type::const_reference;
using pointer = typename container_type::pointer;
using const_pointer = typename container_type::const_pointer;
using iterator = typename container_type::iterator;
using const_iterator = typename container_type::const_iterator;
public:
/* constructors */
unordered_map(unordered_map const &) = default;
constexpr unordered_map(container_type items,
Hash const &hash, KeyEqual const &equal)
: equal_{equal}
, items_{items}
, tables_{
bits::make_pmh_tables<storage_size>(
items_, hash, bits::GetKey{}, default_prg_t{})} {}
explicit constexpr unordered_map(container_type items)
: unordered_map{items, Hash{}, KeyEqual{}} {}
constexpr unordered_map(std::initializer_list<value_type> items,
Hash const & hash, KeyEqual const & equal)
: unordered_map{container_type{items}, hash, equal} {
constexpr_assert(items.size() == N, "Inconsistent initializer_list size and type size argument");
}
constexpr unordered_map(std::initializer_list<value_type> items)
: unordered_map{items, Hash{}, KeyEqual{}} {}
/* iterators */
constexpr iterator begin() { return items_.begin(); }
constexpr iterator end() { return items_.end(); }
constexpr const_iterator begin() const { return items_.begin(); }
constexpr const_iterator end() const { return items_.end(); }
constexpr const_iterator cbegin() const { return items_.cbegin(); }
constexpr const_iterator cend() const { return items_.cend(); }
/* capacity */
constexpr bool empty() const { return !N; }
constexpr size_type size() const { return N; }
constexpr size_type max_size() const { return N; }
/* lookup */
constexpr std::size_t count(Key const &key) const {
auto const &kv = lookup(key);
return equal_(kv.first, key);
}
constexpr Value const &at(Key const &key) const {
return at_impl(*this, key);
}
constexpr Value &at(Key const &key) {
return at_impl(*this, key);
}
constexpr const_iterator find(Key const &key) const {
return find_impl(*this, key);
}
constexpr iterator find(Key const &key) {
return find_impl(*this, key);
}
constexpr std::pair<const_iterator, const_iterator> equal_range(Key const &key) const {
return equal_range_impl(*this, key);
}
constexpr std::pair<iterator, iterator> equal_range(Key const &key) {
return equal_range_impl(*this, key);
}
/* bucket interface */
constexpr std::size_t bucket_count() const { return storage_size; }
constexpr std::size_t max_bucket_count() const { return storage_size; }
/* observers*/
constexpr hasher hash_function() const { return tables_.hash_; }
constexpr key_equal key_eq() const { return equal_; }
private:
template <class This>
static inline constexpr auto& at_impl(This&& self, Key const &key) {
auto& kv = self.lookup(key);
if (self.equal_(kv.first, key))
return kv.second;
else
FROZEN_THROW_OR_ABORT(std::out_of_range("unknown key"));
}
template <class This>
static inline constexpr auto find_impl(This&& self, Key const &key) {
auto& kv = self.lookup(key);
if (self.equal_(kv.first, key))
return &kv;
else
return self.items_.end();
}
template <class This>
static inline constexpr auto equal_range_impl(This&& self, Key const &key) {
auto& kv = self.lookup(key);
using kv_ptr = decltype(&kv);
if (self.equal_(kv.first, key))
return std::pair<kv_ptr, kv_ptr>{&kv, &kv + 1};
else
return std::pair<kv_ptr, kv_ptr>{self.items_.end(), self.items_.end()};
}
template <class This>
static inline constexpr auto& lookup_impl(This&& self, Key const &key) {
return self.items_[self.tables_.lookup(key)];
}
constexpr auto const& lookup(Key const &key) const {
return lookup_impl(*this, key);
}
constexpr auto& lookup(Key const &key) {
return lookup_impl(*this, key);
}
};
template <typename T, typename U, std::size_t N>
constexpr auto make_unordered_map(std::pair<T, U> const (&items)[N]) {
return unordered_map<T, U, N>{items};
}
} // namespace frozen
#endif
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