osb/source/core/StarFlatHashMap.hpp

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#ifndef STAR_FLAT_HASH_MAP_HPP
#define STAR_FLAT_HASH_MAP_HPP
#include <type_traits>
#include "StarFlatHashTable.hpp"
#include "StarHash.hpp"
namespace Star {
template <typename Key, typename Mapped, typename Hash = hash<Key>, typename Equals = std::equal_to<Key>, typename Allocator = std::allocator<Key>>
class FlatHashMap {
public:
typedef Key key_type;
typedef Mapped mapped_type;
typedef pair<key_type const, mapped_type> value_type;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef Hash hasher;
typedef Equals key_equal;
typedef Allocator allocator_type;
typedef value_type& reference;
typedef value_type const& const_reference;
typedef value_type* pointer;
typedef value_type const* const_pointer;
private:
typedef pair<key_type, mapped_type> TableValue;
struct GetKey {
key_type const& operator()(TableValue const& value) const;
};
typedef FlatHashTable<TableValue, key_type, GetKey, Hash, Equals, typename Allocator::template rebind<TableValue>::other> Table;
public:
struct const_iterator {
typedef std::forward_iterator_tag iterator_category;
typedef typename FlatHashMap::value_type const value_type;
typedef ptrdiff_t difference_type;
typedef value_type* pointer;
typedef value_type& reference;
bool operator==(const_iterator const& rhs) const;
bool operator!=(const_iterator const& rhs) const;
const_iterator& operator++();
const_iterator operator++(int);
value_type& operator*() const;
value_type* operator->() const;
typename Table::const_iterator inner;
};
struct iterator {
typedef std::forward_iterator_tag iterator_category;
typedef typename FlatHashMap::value_type value_type;
typedef ptrdiff_t difference_type;
typedef value_type* pointer;
typedef value_type& reference;
bool operator==(iterator const& rhs) const;
bool operator!=(iterator const& rhs) const;
iterator& operator++();
iterator operator++(int);
value_type& operator*() const;
value_type* operator->() const;
operator const_iterator() const;
typename Table::iterator inner;
};
FlatHashMap();
explicit FlatHashMap(size_t bucketCount, hasher const& hash = hasher(),
key_equal const& equal = key_equal(), allocator_type const& alloc = allocator_type());
FlatHashMap(size_t bucketCount, allocator_type const& alloc);
FlatHashMap(size_t bucketCount, hasher const& hash, allocator_type const& alloc);
explicit FlatHashMap(allocator_type const& alloc);
template <typename InputIt>
FlatHashMap(InputIt first, InputIt last, size_t bucketCount = 0,
hasher const& hash = hasher(), key_equal const& equal = key_equal(),
allocator_type const& alloc = allocator_type());
template <typename InputIt>
FlatHashMap(InputIt first, InputIt last, size_t bucketCount, allocator_type const& alloc);
template <typename InputIt>
FlatHashMap(InputIt first, InputIt last, size_t bucketCount,
hasher const& hash, allocator_type const& alloc);
FlatHashMap(FlatHashMap const& other);
FlatHashMap(FlatHashMap const& other, allocator_type const& alloc);
FlatHashMap(FlatHashMap&& other);
FlatHashMap(FlatHashMap&& other, allocator_type const& alloc);
FlatHashMap(initializer_list<value_type> init, size_t bucketCount = 0,
hasher const& hash = hasher(), key_equal const& equal = key_equal(),
allocator_type const& alloc = allocator_type());
FlatHashMap(initializer_list<value_type> init, size_t bucketCount, allocator_type const& alloc);
FlatHashMap(initializer_list<value_type> init, size_t bucketCount, hasher const& hash,
allocator_type const& alloc);
FlatHashMap& operator=(FlatHashMap const& other);
FlatHashMap& operator=(FlatHashMap&& other);
FlatHashMap& operator=(initializer_list<value_type> init);
iterator begin();
iterator end();
const_iterator begin() const;
const_iterator end() const;
const_iterator cbegin() const;
const_iterator cend() const;
size_t empty() const;
size_t size() const;
void clear();
pair<iterator, bool> insert(value_type const& value);
template <typename T, typename = typename std::enable_if<std::is_constructible<TableValue, T&&>::value>::type>
pair<iterator, bool> insert(T&& value);
iterator insert(const_iterator hint, value_type const& value);
template <typename T, typename = typename std::enable_if<std::is_constructible<TableValue, T&&>::value>::type>
iterator insert(const_iterator hint, T&& value);
template <typename InputIt>
void insert(InputIt first, InputIt last);
void insert(initializer_list<value_type> init);
template <typename... Args>
pair<iterator, bool> emplace(Args&&... args);
template <typename... Args>
iterator emplace_hint(const_iterator hint, Args&&... args);
iterator erase(const_iterator pos);
iterator erase(const_iterator first, const_iterator last);
size_t erase(key_type const& key);
mapped_type& at(key_type const& key);
mapped_type const& at(key_type const& key) const;
mapped_type& operator[](key_type const& key);
mapped_type& operator[](key_type&& key);
size_t count(key_type const& key) const;
const_iterator find(key_type const& key) const;
iterator find(key_type const& key);
pair<iterator, iterator> equal_range(key_type const& key);
pair<const_iterator, const_iterator> equal_range(key_type const& key) const;
void reserve(size_t capacity);
bool operator==(FlatHashMap const& rhs) const;
bool operator!=(FlatHashMap const& rhs) const;
private:
Table m_table;
};
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::GetKey::operator()(TableValue const& value) const -> key_type const& {
return value.first;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
bool FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::const_iterator::operator==(const_iterator const& rhs) const {
return inner == rhs.inner;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
bool FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::const_iterator::operator!=(const_iterator const& rhs) const {
return inner != rhs.inner;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::const_iterator::operator++() -> const_iterator& {
++inner;
return *this;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::const_iterator::operator++(int) -> const_iterator {
const_iterator copy(*this);
++*this;
return copy;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::const_iterator::operator*() const -> value_type& {
return *operator->();
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::const_iterator::operator->() const -> value_type* {
return (value_type*)(&*inner);
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
bool FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::iterator::operator==(iterator const& rhs) const {
return inner == rhs.inner;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
bool FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::iterator::operator!=(iterator const& rhs) const {
return inner != rhs.inner;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::iterator::operator++() -> iterator& {
++inner;
return *this;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::iterator::operator++(int) -> iterator {
iterator copy(*this);
operator++();
return copy;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::iterator::operator*() const -> value_type& {
return *operator->();
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::iterator::operator->() const -> value_type* {
return (value_type*)(&*inner);
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::iterator::operator typename FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::const_iterator() const {
return const_iterator{inner};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap()
: FlatHashMap(0) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(size_t bucketCount, hasher const& hash,
key_equal const& equal, allocator_type const& alloc)
: m_table(bucketCount, GetKey(), hash, equal, alloc) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(size_t bucketCount, allocator_type const& alloc)
: FlatHashMap(bucketCount, hasher(), key_equal(), alloc) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(size_t bucketCount, hasher const& hash,
allocator_type const& alloc)
: FlatHashMap(bucketCount, hash, key_equal(), alloc) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(allocator_type const& alloc)
: FlatHashMap(0, hasher(), key_equal(), alloc) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
template <typename InputIt>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(InputIt first, InputIt last, size_t bucketCount,
hasher const& hash, key_equal const& equal, allocator_type const& alloc)
: FlatHashMap(bucketCount, hash, equal, alloc) {
insert(first, last);
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
template <typename InputIt>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(InputIt first, InputIt last, size_t bucketCount,
allocator_type const& alloc)
: FlatHashMap(first, last, bucketCount, hasher(), key_equal(), alloc) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
template <typename InputIt>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(InputIt first, InputIt last, size_t bucketCount,
hasher const& hash, allocator_type const& alloc)
: FlatHashMap(first, last, bucketCount, hash, key_equal(), alloc) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(FlatHashMap const& other)
: FlatHashMap(other, other.m_table.getAllocator()) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(FlatHashMap const& other, allocator_type const& alloc)
: FlatHashMap(alloc) {
operator=(other);
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(FlatHashMap&& other)
: FlatHashMap(std::move(other), other.m_table.getAllocator()) {}
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template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(FlatHashMap&& other, allocator_type const& alloc)
: FlatHashMap(alloc) {
operator=(std::move(other));
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}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(initializer_list<value_type> init, size_t bucketCount, hasher const& hash,
key_equal const& equal, allocator_type const& alloc)
: FlatHashMap(bucketCount, hash, equal, alloc) {
operator=(init);
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(initializer_list<value_type> init, size_t bucketCount,
allocator_type const& alloc)
: FlatHashMap(init, bucketCount, hasher(), key_equal(), alloc) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::FlatHashMap(initializer_list<value_type> init, size_t bucketCount, hasher const& hash,
allocator_type const& alloc)
: FlatHashMap(init, bucketCount, hash, key_equal(), alloc) {}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::operator=(FlatHashMap const& other) -> FlatHashMap& {
m_table.clear();
m_table.reserve(other.size());
for (auto const& p : other)
m_table.insert(p);
return *this;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::operator=(FlatHashMap&& other) -> FlatHashMap& {
m_table = std::move(other.m_table);
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return *this;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::operator=(initializer_list<value_type> init) -> FlatHashMap& {
clear();
insert(init.begin(), init.end());
return *this;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::begin() -> iterator {
return iterator{m_table.begin()};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::end() -> iterator {
return iterator{m_table.end()};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::begin() const -> const_iterator {
return const_iterator{m_table.begin()};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::end() const -> const_iterator {
return const_iterator{m_table.end()};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::cbegin() const -> const_iterator {
return begin();
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::cend() const -> const_iterator {
return end();
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
size_t FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::empty() const {
return m_table.empty();
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
size_t FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::size() const {
return m_table.size();
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
void FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::clear() {
m_table.clear();
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::insert(value_type const& value) -> pair<iterator, bool> {
auto res = m_table.insert(TableValue(value));
return {iterator{res.first}, res.second};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
template <typename T, typename>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::insert(T&& value) -> pair<iterator, bool> {
auto res = m_table.insert(TableValue(std::forward<T&&>(value)));
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return {iterator{res.first}, res.second};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::insert(const_iterator hint, value_type const& value) -> iterator {
return insert(hint, TableValue(value));
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
template <typename T, typename>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::insert(const_iterator, T&& value) -> iterator {
return insert(std::forward<T&&>(value)).first;
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}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
template <typename InputIt>
void FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::insert(InputIt first, InputIt last) {
m_table.reserve(m_table.size() + std::distance(first, last));
for (auto i = first; i != last; ++i)
m_table.insert(*i);
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
void FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::insert(initializer_list<value_type> init) {
insert(init.begin(), init.end());
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
template <typename... Args>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::emplace(Args&&... args) -> pair<iterator, bool> {
return insert(TableValue(std::forward<Args>(args)...));
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}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
template <typename... Args>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::emplace_hint(const_iterator hint, Args&&... args) -> iterator {
return insert(hint, TableValue(std::forward<Args>(args)...));
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}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::erase(const_iterator pos) -> iterator {
return iterator{m_table.erase(pos.inner)};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::erase(const_iterator first, const_iterator last) -> iterator {
return iterator{m_table.erase(first.inner, last.inner)};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
size_t FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::erase(key_type const& key) {
auto i = m_table.find(key);
if (i != m_table.end()) {
m_table.erase(i);
return 1;
}
return 0;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::at(key_type const& key) -> mapped_type& {
auto i = m_table.find(key);
if (i == m_table.end())
throw std::out_of_range("no such key in FlatHashMap");
return i->second;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::at(key_type const& key) const -> mapped_type const& {
auto i = m_table.find(key);
if (i == m_table.end())
throw std::out_of_range("no such key in FlatHashMap");
return i->second;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::operator[](key_type const& key) -> mapped_type& {
auto i = m_table.find(key);
if (i != m_table.end())
return i->second;
return m_table.insert({key, mapped_type()}).first->second;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::operator[](key_type&& key) -> mapped_type& {
auto i = m_table.find(key);
if (i != m_table.end())
return i->second;
return m_table.insert({std::move(key), mapped_type()}).first->second;
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}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
size_t FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::count(key_type const& key) const {
if (m_table.find(key) != m_table.end())
return 1;
else
return 0;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::find(key_type const& key) const -> const_iterator {
return const_iterator{m_table.find(key)};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::find(key_type const& key) -> iterator {
return iterator{m_table.find(key)};
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::equal_range(key_type const& key) -> pair<iterator, iterator> {
auto i = find(key);
if (i != end()) {
auto j = i;
++j;
return {i, j};
} else {
return {i, i};
}
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
auto FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::equal_range(key_type const& key) const -> pair<const_iterator, const_iterator> {
auto i = find(key);
if (i != end()) {
auto j = i;
++j;
return {i, j};
} else {
return {i, i};
}
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
void FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::reserve(size_t capacity) {
m_table.reserve(capacity);
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
bool FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::operator==(FlatHashMap const& rhs) const {
return m_table == rhs.m_table;
}
template <typename Key, typename Mapped, typename Hash, typename Equals, typename Allocator>
bool FlatHashMap<Key, Mapped, Hash, Equals, Allocator>::operator!=(FlatHashMap const& rhs) const {
return m_table != rhs.m_table;
}
}
#endif