#include <robin_map.h>
Classes | |
class | KeySelect |
class | ValueSelect |
Public Types | |
using | key_type = typename ht::key_type |
using | mapped_type = T |
using | value_type = typename ht::value_type |
using | size_type = typename ht::size_type |
using | difference_type = typename ht::difference_type |
using | hasher = typename ht::hasher |
using | key_equal = typename ht::key_equal |
using | allocator_type = typename ht::allocator_type |
using | reference = typename ht::reference |
using | const_reference = typename ht::const_reference |
using | pointer = typename ht::pointer |
using | const_pointer = typename ht::const_pointer |
using | iterator = typename ht::iterator |
using | const_iterator = typename ht::const_iterator |
Public Member Functions | |
robin_map () | |
robin_map (size_type bucket_count, const Hash &hash=Hash(), const KeyEqual &equal=KeyEqual(), const Allocator &alloc=Allocator()) | |
robin_map (size_type bucket_count, const Allocator &alloc) | |
robin_map (size_type bucket_count, const Hash &hash, const Allocator &alloc) | |
robin_map (const Allocator &alloc) | |
template<class InputIt> | |
robin_map (InputIt first, InputIt last, size_type bucket_count=ht::DEFAULT_INIT_BUCKETS_SIZE, const Hash &hash=Hash(), const KeyEqual &equal=KeyEqual(), const Allocator &alloc=Allocator()) | |
template<class InputIt> | |
robin_map (InputIt first, InputIt last, size_type bucket_count, const Allocator &alloc) | |
template<class InputIt> | |
robin_map (InputIt first, InputIt last, size_type bucket_count, const Hash &hash, const Allocator &alloc) | |
robin_map (std::initializer_list< value_type > init, size_type bucket_count=ht::DEFAULT_INIT_BUCKETS_SIZE, const Hash &hash=Hash(), const KeyEqual &equal=KeyEqual(), const Allocator &alloc=Allocator()) | |
robin_map (std::initializer_list< value_type > init, size_type bucket_count, const Allocator &alloc) | |
robin_map (std::initializer_list< value_type > init, size_type bucket_count, const Hash &hash, const Allocator &alloc) | |
robin_map & | operator= (std::initializer_list< value_type > ilist) |
allocator_type | get_allocator () const |
iterator | begin () noexcept |
const_iterator | begin () const noexcept |
const_iterator | cbegin () const noexcept |
iterator | end () noexcept |
const_iterator | end () const noexcept |
const_iterator | cend () const noexcept |
bool | empty () const noexcept |
size_type | size () const noexcept |
size_type | max_size () const noexcept |
void | clear () noexcept |
std::pair< iterator, bool > | insert (const value_type &value) |
template<class P, typename std::enable_if< std::is_constructible< value_type, P && >::value >::type * = nullptr> | |
std::pair< iterator, bool > | insert (P &&value) |
std::pair< iterator, bool > | insert (value_type &&value) |
iterator | insert (const_iterator hint, const value_type &value) |
template<class P, typename std::enable_if< std::is_constructible< value_type, P && >::value >::type * = nullptr> | |
iterator | insert (const_iterator hint, P &&value) |
iterator | insert (const_iterator hint, value_type &&value) |
template<class InputIt> | |
void | insert (InputIt first, InputIt last) |
void | insert (std::initializer_list< value_type > ilist) |
template<class M> | |
std::pair< iterator, bool > | insert_or_assign (const key_type &k, M &&obj) |
template<class M> | |
std::pair< iterator, bool > | insert_or_assign (key_type &&k, M &&obj) |
template<class M> | |
iterator | insert_or_assign (const_iterator hint, const key_type &k, M &&obj) |
template<class M> | |
iterator | insert_or_assign (const_iterator hint, key_type &&k, M &&obj) |
template<class... Args> | |
std::pair< iterator, bool > | emplace (Args &&...args) |
template<class... Args> | |
iterator | emplace_hint (const_iterator hint, Args &&...args) |
template<class... Args> | |
std::pair< iterator, bool > | try_emplace (const key_type &k, Args &&...args) |
template<class... Args> | |
std::pair< iterator, bool > | try_emplace (key_type &&k, Args &&...args) |
template<class... Args> | |
iterator | try_emplace (const_iterator hint, const key_type &k, Args &&...args) |
template<class... Args> | |
iterator | try_emplace (const_iterator hint, key_type &&k, Args &&...args) |
iterator | erase (iterator pos) |
iterator | erase (const_iterator pos) |
iterator | erase (const_iterator first, const_iterator last) |
size_type | erase (const key_type &key) |
size_type | erase (const key_type &key, std::size_t precalculated_hash) |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
size_type | erase (const K &key) |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
size_type | erase (const K &key, std::size_t precalculated_hash) |
void | swap (robin_map &other) |
T & | at (const Key &key) |
T & | at (const Key &key, std::size_t precalculated_hash) |
const T & | at (const Key &key) const |
const T & | at (const Key &key, std::size_t precalculated_hash) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
T & | at (const K &key) |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
T & | at (const K &key, std::size_t precalculated_hash) |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
const T & | at (const K &key) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
const T & | at (const K &key, std::size_t precalculated_hash) const |
T & | operator[] (const Key &key) |
T & | operator[] (Key &&key) |
size_type | count (const Key &key) const |
size_type | count (const Key &key, std::size_t precalculated_hash) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
size_type | count (const K &key) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
size_type | count (const K &key, std::size_t precalculated_hash) const |
iterator | find (const Key &key) |
iterator | find (const Key &key, std::size_t precalculated_hash) |
const_iterator | find (const Key &key) const |
const_iterator | find (const Key &key, std::size_t precalculated_hash) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
iterator | find (const K &key) |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
iterator | find (const K &key, std::size_t precalculated_hash) |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
const_iterator | find (const K &key) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
const_iterator | find (const K &key, std::size_t precalculated_hash) const |
bool | contains (const Key &key) const |
bool | contains (const Key &key, std::size_t precalculated_hash) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
bool | contains (const K &key) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
bool | contains (const K &key, std::size_t precalculated_hash) const |
std::pair< iterator, iterator > | equal_range (const Key &key) |
std::pair< iterator, iterator > | equal_range (const Key &key, std::size_t precalculated_hash) |
std::pair< const_iterator, const_iterator > | equal_range (const Key &key) const |
std::pair< const_iterator, const_iterator > | equal_range (const Key &key, std::size_t precalculated_hash) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
std::pair< iterator, iterator > | equal_range (const K &key) |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
std::pair< iterator, iterator > | equal_range (const K &key, std::size_t precalculated_hash) |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
std::pair< const_iterator, const_iterator > | equal_range (const K &key) const |
template<class K, class KE = KeyEqual, typename std::enable_if< has_is_transparent< KE >::value >::type * = nullptr> | |
std::pair< const_iterator, const_iterator > | equal_range (const K &key, std::size_t precalculated_hash) const |
size_type | bucket_count () const |
size_type | max_bucket_count () const |
float | load_factor () const |
float | min_load_factor () const |
float | max_load_factor () const |
void | min_load_factor (float ml) |
void | max_load_factor (float ml) |
void | rehash (size_type my_count) |
void | reserve (size_type my_count) |
hasher | hash_function () const |
key_equal | key_eq () const |
iterator | mutable_iterator (const_iterator pos) |
template<class Serializer> | |
void | serialize (Serializer &serializer) const |
Static Public Member Functions | |
template<class Deserializer> | |
static robin_map | deserialize (Deserializer &deserializer, bool hash_compatible=false) |
Private Types | |
template<typename U> | |
using | has_is_transparent = tsl::detail_robin_hash::has_is_transparent<U> |
using | ht |
Private Attributes | |
ht | m_ht |
Friends | |
bool | operator== (const robin_map &lhs, const robin_map &rhs) |
bool | operator!= (const robin_map &lhs, const robin_map &rhs) |
void | swap (robin_map &lhs, robin_map &rhs) |
Implementation of a hash map using open-addressing and the robin hood hashing algorithm with backward shift deletion.
For operations modifying the hash map (insert, erase, rehash, ...), the strong exception guarantee is only guaranteed when the expression std::is_nothrow_swappable<std::pair<Key, T>>\:\:value && std::is_nothrow_move_constructible<std::pair<Key, T>>\:\:value
is true, otherwise if an exception is thrown during the swap or the move, the hash map may end up in a undefined state. Per the standard a Key
or T
with a noexcept copy constructor and no move constructor also satisfies the std::is_nothrow_move_constructible<std::pair<Key, T>>\:\:value
criterion (and will thus guarantee the strong exception for the map).
When StoreHash
is true, 32 bits of the hash are stored alongside the values. It can improve the performance during lookups if the KeyEqual
function takes time (if it engenders a cache-miss for example) as we then compare the stored hashes before comparing the keys. When tsl::rh::power_of_two_growth_policy
is used as GrowthPolicy
, it may also speed-up the rehash process as we can avoid to recalculate the hash. When it is detected that storing the hash will not incur any memory penalty due to alignment (i.e. sizeof(tsl::detail_robin_hash::bucket_entry<ValueType, true>) == sizeof(tsl::detail_robin_hash::bucket_entry<ValueType, false>)
) and tsl::rh::power_of_two_growth_policy
is used, the hash will be stored even if StoreHash
is false so that we can speed-up the rehash (but it will not be used on lookups unless StoreHash
is true).
GrowthPolicy
defines how the map grows and consequently how a hash value is mapped to a bucket. By default the map uses tsl::rh::power_of_two_growth_policy
. This policy keeps the number of buckets to a power of two and uses a mask to map the hash to a bucket instead of the slow modulo. Other growth policies are available and you may define your own growth policy, check tsl::rh::power_of_two_growth_policy
for the interface.
std::pair<Key, T>
must be swappable.
Key
and T
must be copy and/or move constructible.
If the destructor of Key
or T
throws an exception, the behaviour of the class is undefined.
Iterators invalidation:
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::allocator_type = typename ht::allocator_type |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::const_iterator = typename ht::const_iterator |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::const_pointer = typename ht::const_pointer |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::const_reference = typename ht::const_reference |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::difference_type = typename ht::difference_type |
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using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::hasher = typename ht::hasher |
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using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::iterator = typename ht::iterator |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::key_equal = typename ht::key_equal |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::key_type = typename ht::key_type |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::mapped_type = T |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::pointer = typename ht::pointer |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::reference = typename ht::reference |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::size_type = typename ht::size_type |
using tsl::robin_map< Key, T, Hash, KeyEqual, Allocator, StoreHash, GrowthPolicy >::value_type = typename ht::value_type |
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This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists. If so, K must be hashable and comparable to Key.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists. If so, K must be hashable and comparable to Key.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists. If so, K must be hashable and comparable to Key.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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Deserialize a previously serialized map through the deserializer
parameter.
The deserializer
parameter must be a function object that supports the following call:
template<typename U> U operator()();
where the types std::int16_t
, std::uint32_t
, std::uint64_t
, float
and std::pair<Key, T>
must be supported for U.If the deserialized hash map type is hash compatible with the serialized map, the deserialization process can be sped up by setting hash_compatible
to true. To be hash compatible, the Hash, KeyEqual and GrowthPolicy must behave the same way than the ones used on the serialized map and the StoreHash must have the same value. The std::size_t
must also be of the same size as the one on the platform used to serialize the map. If these criteria are not met, the behaviour is undefined with hash_compatible
sets to true.
The behaviour is undefined if the type Key
and T
of the robin_map
are not the same as the types used during serialization.
The implementation leaves binary compatibility (endianness, IEEE 754 for floats, size of int, ...) of the types it deserializes in the hands of the Deserializer
function object if compatibility is required.
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Due to the way elements are stored, emplace will need to move or copy the key-value once. The method is equivalent to insert(value_type(std::forward<Args>(args)...));
Mainly here for compatibility with the std::unordered_map interface.
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Due to the way elements are stored, emplace_hint will need to move or copy the key-value once. The method is equivalent to insert(hint, value_type(std::forward<Args>(args)...));
Mainly here for compatibility with the std::unordered_map interface.
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This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists. If so, K must be hashable and comparable to Key.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists. If so, K must be hashable and comparable to Key.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup to the value if you already have the hash.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup to the value if you already have the hash.
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This overload only participates in the overload resolution if the typedef KeyEqual::is_transparent exists. If so, K must be hashable and comparable to Key.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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Use the hash value 'precalculated_hash' instead of hashing the key. The hash value should be the same as hash_function()(key). Useful to speed-up the lookup if you already have the hash.
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Set the min_load_factor
to ml
. When the load_factor
of the map goes below min_load_factor
after some erase operations, the map will be shrunk when an insertion occurs. The erase method itself never shrinks the map.
The default value of min_load_factor
is 0.0f, the map never shrinks by default.
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Convert a const_iterator to an iterator.
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Serialize the map through the serializer
parameter.
The serializer
parameter must be a function object that supports the following call:
template<typename U> void operator()(const U& value);
where the types std::int16_t
, std::uint32_t
, std::uint64_t
, float
and std::pair<Key, T>
must be supported for U.The implementation leaves binary compatibility (endianness, IEEE 754 for floats, ...) of the types it serializes in the hands of the Serializer
function object if compatibility is required.
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