forked from boostorg/unordered
629 lines
20 KiB
C++
629 lines
20 KiB
C++
|
|
// Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
|
|
// Copyright (C) 2005-2011 Daniel James
|
|
// Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
#ifndef BOOST_UNORDERED_DETAIL_UNIQUE_HPP_INCLUDED
|
|
#define BOOST_UNORDERED_DETAIL_UNIQUE_HPP_INCLUDED
|
|
|
|
#include <boost/config.hpp>
|
|
#if defined(BOOST_HAS_PRAGMA_ONCE)
|
|
#pragma once
|
|
#endif
|
|
|
|
#include <boost/unordered/detail/table.hpp>
|
|
#include <boost/unordered/detail/extract_key.hpp>
|
|
#include <boost/throw_exception.hpp>
|
|
#include <stdexcept>
|
|
|
|
namespace boost { namespace unordered { namespace detail {
|
|
|
|
template <typename A, typename T> struct unique_node;
|
|
template <typename T> struct ptr_node;
|
|
template <typename Types> struct table_impl;
|
|
|
|
template <typename A, typename T>
|
|
struct unique_node :
|
|
boost::unordered::detail::value_base<T>
|
|
{
|
|
typedef typename ::boost::unordered::detail::rebind_wrap<
|
|
A, unique_node<A, T> >::type allocator;
|
|
typedef typename ::boost::unordered::detail::
|
|
allocator_traits<allocator>::pointer node_pointer;
|
|
typedef node_pointer link_pointer;
|
|
|
|
link_pointer next_;
|
|
std::size_t hash_;
|
|
|
|
unique_node() :
|
|
next_(),
|
|
hash_(0)
|
|
{}
|
|
|
|
void init(node_pointer)
|
|
{
|
|
}
|
|
|
|
private:
|
|
unique_node& operator=(unique_node const&);
|
|
};
|
|
|
|
template <typename T>
|
|
struct ptr_node :
|
|
boost::unordered::detail::ptr_bucket
|
|
{
|
|
typedef T value_type;
|
|
typedef boost::unordered::detail::ptr_bucket bucket_base;
|
|
typedef ptr_node<T>* node_pointer;
|
|
typedef ptr_bucket* link_pointer;
|
|
|
|
std::size_t hash_;
|
|
boost::unordered::detail::value_base<T> value_base_;
|
|
|
|
ptr_node() :
|
|
bucket_base(),
|
|
hash_(0)
|
|
{}
|
|
|
|
void init(node_pointer)
|
|
{
|
|
}
|
|
|
|
void* address() { return value_base_.address(); }
|
|
value_type& value() { return value_base_.value(); }
|
|
value_type* value_ptr() { return value_base_.value_ptr(); }
|
|
|
|
private:
|
|
ptr_node& operator=(ptr_node const&);
|
|
};
|
|
|
|
// If the allocator uses raw pointers use ptr_node
|
|
// Otherwise use node.
|
|
|
|
template <typename A, typename T, typename NodePtr, typename BucketPtr>
|
|
struct pick_node2
|
|
{
|
|
typedef boost::unordered::detail::unique_node<A, T> node;
|
|
|
|
typedef typename boost::unordered::detail::allocator_traits<
|
|
typename boost::unordered::detail::rebind_wrap<A, node>::type
|
|
>::pointer node_pointer;
|
|
|
|
typedef boost::unordered::detail::bucket<node_pointer> bucket;
|
|
typedef node_pointer link_pointer;
|
|
};
|
|
|
|
template <typename A, typename T>
|
|
struct pick_node2<A, T,
|
|
boost::unordered::detail::ptr_node<T>*,
|
|
boost::unordered::detail::ptr_bucket*>
|
|
{
|
|
typedef boost::unordered::detail::ptr_node<T> node;
|
|
typedef boost::unordered::detail::ptr_bucket bucket;
|
|
typedef bucket* link_pointer;
|
|
};
|
|
|
|
template <typename A, typename T>
|
|
struct pick_node
|
|
{
|
|
typedef boost::unordered::detail::allocator_traits<
|
|
typename boost::unordered::detail::rebind_wrap<A,
|
|
boost::unordered::detail::ptr_node<T> >::type
|
|
> tentative_node_traits;
|
|
|
|
typedef boost::unordered::detail::allocator_traits<
|
|
typename boost::unordered::detail::rebind_wrap<A,
|
|
boost::unordered::detail::ptr_bucket >::type
|
|
> tentative_bucket_traits;
|
|
|
|
typedef pick_node2<A, T,
|
|
typename tentative_node_traits::pointer,
|
|
typename tentative_bucket_traits::pointer> pick;
|
|
|
|
typedef typename pick::node node;
|
|
typedef typename pick::bucket bucket;
|
|
typedef typename pick::link_pointer link_pointer;
|
|
};
|
|
|
|
template <typename A, typename T, typename H, typename P>
|
|
struct set
|
|
{
|
|
typedef boost::unordered::detail::set<A, T, H, P> types;
|
|
|
|
typedef A allocator;
|
|
typedef T value_type;
|
|
typedef H hasher;
|
|
typedef P key_equal;
|
|
typedef T key_type;
|
|
|
|
typedef boost::unordered::detail::allocator_traits<allocator> traits;
|
|
typedef boost::unordered::detail::pick_node<allocator, value_type> pick;
|
|
typedef typename pick::node node;
|
|
typedef typename pick::bucket bucket;
|
|
typedef typename pick::link_pointer link_pointer;
|
|
|
|
typedef boost::unordered::detail::table_impl<types> table;
|
|
typedef boost::unordered::detail::set_extractor<value_type> extractor;
|
|
|
|
typedef typename boost::unordered::detail::pick_policy<T>::type policy;
|
|
};
|
|
|
|
template <typename A, typename K, typename M, typename H, typename P>
|
|
struct map
|
|
{
|
|
typedef boost::unordered::detail::map<A, K, M, H, P> types;
|
|
|
|
typedef A allocator;
|
|
typedef std::pair<K const, M> value_type;
|
|
typedef H hasher;
|
|
typedef P key_equal;
|
|
typedef K key_type;
|
|
|
|
typedef boost::unordered::detail::allocator_traits<allocator>
|
|
traits;
|
|
typedef boost::unordered::detail::pick_node<allocator, value_type> pick;
|
|
typedef typename pick::node node;
|
|
typedef typename pick::bucket bucket;
|
|
typedef typename pick::link_pointer link_pointer;
|
|
|
|
typedef boost::unordered::detail::table_impl<types> table;
|
|
typedef boost::unordered::detail::map_extractor<key_type, value_type>
|
|
extractor;
|
|
|
|
typedef typename boost::unordered::detail::pick_policy<K>::type policy;
|
|
};
|
|
|
|
template <typename Types>
|
|
struct table_impl : boost::unordered::detail::table<Types>
|
|
{
|
|
typedef boost::unordered::detail::table<Types> table;
|
|
typedef typename table::value_type value_type;
|
|
typedef typename table::bucket bucket;
|
|
typedef typename table::policy policy;
|
|
typedef typename table::node_pointer node_pointer;
|
|
typedef typename table::node_allocator node_allocator;
|
|
typedef typename table::node_allocator_traits node_allocator_traits;
|
|
typedef typename table::bucket_pointer bucket_pointer;
|
|
typedef typename table::link_pointer link_pointer;
|
|
typedef typename table::hasher hasher;
|
|
typedef typename table::key_equal key_equal;
|
|
typedef typename table::key_type key_type;
|
|
typedef typename table::node_constructor node_constructor;
|
|
typedef typename table::extractor extractor;
|
|
typedef typename table::iterator iterator;
|
|
typedef typename table::c_iterator c_iterator;
|
|
|
|
typedef std::pair<iterator, bool> emplace_return;
|
|
|
|
// Constructors
|
|
|
|
table_impl(std::size_t n,
|
|
hasher const& hf,
|
|
key_equal const& eq,
|
|
node_allocator const& a)
|
|
: table(n, hf, eq, a)
|
|
{}
|
|
|
|
table_impl(table_impl const& x)
|
|
: table(x, node_allocator_traits::
|
|
select_on_container_copy_construction(x.node_alloc()))
|
|
{
|
|
this->init(x);
|
|
}
|
|
|
|
table_impl(table_impl const& x,
|
|
node_allocator const& a)
|
|
: table(x, a)
|
|
{
|
|
this->init(x);
|
|
}
|
|
|
|
table_impl(table_impl& x,
|
|
boost::unordered::detail::move_tag m)
|
|
: table(x, m)
|
|
{}
|
|
|
|
table_impl(table_impl& x,
|
|
node_allocator const& a,
|
|
boost::unordered::detail::move_tag m)
|
|
: table(x, a, m)
|
|
{
|
|
this->move_init(x);
|
|
}
|
|
|
|
// Accessors
|
|
|
|
template <class Key, class Pred>
|
|
iterator find_node_impl(
|
|
std::size_t key_hash,
|
|
Key const& k,
|
|
Pred const& eq) const
|
|
{
|
|
std::size_t bucket_index = this->hash_to_bucket(key_hash);
|
|
iterator n = this->begin(bucket_index);
|
|
|
|
for (;;)
|
|
{
|
|
if (!n.node_) return n;
|
|
|
|
std::size_t node_hash = n.node_->hash_;
|
|
if (key_hash == node_hash)
|
|
{
|
|
if (eq(k, this->get_key(*n)))
|
|
return n;
|
|
}
|
|
else
|
|
{
|
|
if (this->hash_to_bucket(node_hash) != bucket_index)
|
|
return iterator();
|
|
}
|
|
|
|
++n;
|
|
}
|
|
}
|
|
|
|
std::size_t count(key_type const& k) const
|
|
{
|
|
return this->find_node(k).node_ ? 1 : 0;
|
|
}
|
|
|
|
value_type& at(key_type const& k) const
|
|
{
|
|
if (this->size_) {
|
|
iterator it = this->find_node(k);
|
|
if (it.node_) return *it;
|
|
}
|
|
|
|
boost::throw_exception(
|
|
std::out_of_range("Unable to find key in unordered_map."));
|
|
}
|
|
|
|
std::pair<iterator, iterator>
|
|
equal_range(key_type const& k) const
|
|
{
|
|
iterator n = this->find_node(k);
|
|
iterator n2 = n;
|
|
if (n2.node_) ++n2;
|
|
return std::make_pair(n, n2);
|
|
}
|
|
|
|
// equals
|
|
|
|
bool equals(table_impl const& other) const
|
|
{
|
|
if(this->size_ != other.size_) return false;
|
|
|
|
for(iterator n1 = this->begin(); n1.node_; ++n1)
|
|
{
|
|
iterator n2 = other.find_matching_node(n1);
|
|
|
|
if (!n2.node_ || *n1 != *n2)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Emplace/Insert
|
|
|
|
inline iterator add_node(
|
|
node_constructor& a,
|
|
std::size_t key_hash)
|
|
{
|
|
node_pointer n = a.release();
|
|
n->hash_ = key_hash;
|
|
|
|
bucket_pointer b = this->get_bucket(this->hash_to_bucket(key_hash));
|
|
|
|
if (!b->next_)
|
|
{
|
|
link_pointer start_node = this->get_previous_start();
|
|
|
|
if (start_node->next_) {
|
|
this->get_bucket(this->hash_to_bucket(
|
|
static_cast<node_pointer>(start_node->next_)->hash_)
|
|
)->next_ = n;
|
|
}
|
|
|
|
b->next_ = start_node;
|
|
n->next_ = start_node->next_;
|
|
start_node->next_ = n;
|
|
}
|
|
else
|
|
{
|
|
n->next_ = b->next_->next_;
|
|
b->next_->next_ = n;
|
|
}
|
|
|
|
++this->size_;
|
|
return iterator(n);
|
|
}
|
|
|
|
value_type& operator[](key_type const& k)
|
|
{
|
|
std::size_t key_hash = this->hash(k);
|
|
iterator pos = this->find_node(key_hash, k);
|
|
|
|
if (pos.node_) return *pos;
|
|
|
|
// Create the node before rehashing in case it throws an
|
|
// exception (need strong safety in such a case).
|
|
node_constructor a(this->node_alloc());
|
|
a.construct_with_value(BOOST_UNORDERED_EMPLACE_ARGS3(
|
|
boost::unordered::piecewise_construct,
|
|
boost::make_tuple(k),
|
|
boost::make_tuple()));
|
|
|
|
this->reserve_for_insert(this->size_ + 1);
|
|
return *add_node(a, key_hash);
|
|
}
|
|
|
|
#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
|
|
# if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
|
|
emplace_return emplace(boost::unordered::detail::emplace_args1<
|
|
boost::unordered::detail::please_ignore_this_overload> const&)
|
|
{
|
|
BOOST_ASSERT(false);
|
|
return emplace_return(this->begin(), false);
|
|
}
|
|
# else
|
|
emplace_return emplace(
|
|
boost::unordered::detail::please_ignore_this_overload const&)
|
|
{
|
|
BOOST_ASSERT(false);
|
|
return emplace_return(this->begin(), false);
|
|
}
|
|
# endif
|
|
#endif
|
|
|
|
template <BOOST_UNORDERED_EMPLACE_TEMPLATE>
|
|
emplace_return emplace(BOOST_UNORDERED_EMPLACE_ARGS)
|
|
{
|
|
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
|
|
return emplace_impl(
|
|
extractor::extract(BOOST_UNORDERED_EMPLACE_FORWARD),
|
|
BOOST_UNORDERED_EMPLACE_FORWARD);
|
|
#else
|
|
return emplace_impl(
|
|
extractor::extract(args.a0, args.a1),
|
|
BOOST_UNORDERED_EMPLACE_FORWARD);
|
|
#endif
|
|
}
|
|
|
|
#if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
|
|
template <typename A0>
|
|
emplace_return emplace(
|
|
boost::unordered::detail::emplace_args1<A0> const& args)
|
|
{
|
|
return emplace_impl(extractor::extract(args.a0), args);
|
|
}
|
|
#endif
|
|
|
|
template <BOOST_UNORDERED_EMPLACE_TEMPLATE>
|
|
emplace_return emplace_impl(key_type const& k,
|
|
BOOST_UNORDERED_EMPLACE_ARGS)
|
|
{
|
|
std::size_t key_hash = this->hash(k);
|
|
iterator pos = this->find_node(key_hash, k);
|
|
|
|
if (pos.node_) return emplace_return(pos, false);
|
|
|
|
// Create the node before rehashing in case it throws an
|
|
// exception (need strong safety in such a case).
|
|
node_constructor a(this->node_alloc());
|
|
a.construct_with_value(BOOST_UNORDERED_EMPLACE_FORWARD);
|
|
|
|
// reserve has basic exception safety if the hash function
|
|
// throws, strong otherwise.
|
|
this->reserve_for_insert(this->size_ + 1);
|
|
return emplace_return(this->add_node(a, key_hash), true);
|
|
}
|
|
|
|
emplace_return emplace_impl_with_node(node_constructor& a)
|
|
{
|
|
key_type const& k = this->get_key(a.value());
|
|
std::size_t key_hash = this->hash(k);
|
|
iterator pos = this->find_node(key_hash, k);
|
|
|
|
if (pos.node_) return emplace_return(pos, false);
|
|
|
|
// reserve has basic exception safety if the hash function
|
|
// throws, strong otherwise.
|
|
this->reserve_for_insert(this->size_ + 1);
|
|
return emplace_return(this->add_node(a, key_hash), true);
|
|
}
|
|
|
|
template <BOOST_UNORDERED_EMPLACE_TEMPLATE>
|
|
emplace_return emplace_impl(no_key, BOOST_UNORDERED_EMPLACE_ARGS)
|
|
{
|
|
// Don't have a key, so construct the node first in order
|
|
// to be able to lookup the position.
|
|
node_constructor a(this->node_alloc());
|
|
a.construct_with_value(BOOST_UNORDERED_EMPLACE_FORWARD);
|
|
return emplace_impl_with_node(a);
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// Insert range methods
|
|
//
|
|
// if hash function throws, or inserting > 1 element, basic exception
|
|
// safety strong otherwise
|
|
|
|
template <class InputIt>
|
|
void insert_range(InputIt i, InputIt j)
|
|
{
|
|
if(i != j)
|
|
return insert_range_impl(extractor::extract(*i), i, j);
|
|
}
|
|
|
|
template <class InputIt>
|
|
void insert_range_impl(key_type const& k, InputIt i, InputIt j)
|
|
{
|
|
node_constructor a(this->node_alloc());
|
|
|
|
insert_range_impl2(a, k, i, j);
|
|
|
|
while(++i != j) {
|
|
// Note: can't use get_key as '*i' might not be value_type - it
|
|
// could be a pair with first_types as key_type without const or
|
|
// a different second_type.
|
|
//
|
|
// TODO: Might be worth storing the value_type instead of the
|
|
// key here. Could be more efficient if '*i' is expensive. Could
|
|
// be less efficient if copying the full value_type is
|
|
// expensive.
|
|
insert_range_impl2(a, extractor::extract(*i), i, j);
|
|
}
|
|
}
|
|
|
|
template <class InputIt>
|
|
void insert_range_impl2(node_constructor& a, key_type const& k,
|
|
InputIt i, InputIt j)
|
|
{
|
|
// No side effects in this initial code
|
|
std::size_t key_hash = this->hash(k);
|
|
iterator pos = this->find_node(key_hash, k);
|
|
|
|
if (!pos.node_) {
|
|
a.construct_with_value2(*i);
|
|
if(this->size_ + 1 > this->max_load_)
|
|
this->reserve_for_insert(this->size_ +
|
|
boost::unordered::detail::insert_size(i, j));
|
|
|
|
// Nothing after this point can throw.
|
|
this->add_node(a, key_hash);
|
|
}
|
|
}
|
|
|
|
template <class InputIt>
|
|
void insert_range_impl(no_key, InputIt i, InputIt j)
|
|
{
|
|
node_constructor a(this->node_alloc());
|
|
|
|
do {
|
|
a.construct_with_value2(*i);
|
|
emplace_impl_with_node(a);
|
|
} while(++i != j);
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// Erase
|
|
//
|
|
// no throw
|
|
|
|
std::size_t erase_key(key_type const& k)
|
|
{
|
|
if(!this->size_) return 0;
|
|
|
|
std::size_t key_hash = this->hash(k);
|
|
std::size_t bucket_index = this->hash_to_bucket(key_hash);
|
|
link_pointer prev = this->get_previous_start(bucket_index);
|
|
if (!prev) return 0;
|
|
|
|
for (;;)
|
|
{
|
|
if (!prev->next_) return 0;
|
|
std::size_t node_hash =
|
|
static_cast<node_pointer>(prev->next_)->hash_;
|
|
if (this->hash_to_bucket(node_hash) != bucket_index)
|
|
return 0;
|
|
if (node_hash == key_hash &&
|
|
this->key_eq()(k, this->get_key(
|
|
static_cast<node_pointer>(prev->next_)->value())))
|
|
break;
|
|
prev = prev->next_;
|
|
}
|
|
|
|
link_pointer end = static_cast<node_pointer>(prev->next_)->next_;
|
|
|
|
std::size_t deleted_count = this->delete_nodes(prev, end);
|
|
this->fix_bucket(bucket_index, prev);
|
|
return deleted_count;
|
|
}
|
|
|
|
iterator erase(c_iterator r)
|
|
{
|
|
BOOST_ASSERT(r.node_);
|
|
iterator next(r.node_);
|
|
++next;
|
|
erase_nodes(r.node_, next.node_);
|
|
return next;
|
|
}
|
|
|
|
iterator erase_range(c_iterator r1, c_iterator r2)
|
|
{
|
|
if (r1 == r2) return iterator(r2.node_);
|
|
erase_nodes(r1.node_, r2.node_);
|
|
return iterator(r2.node_);
|
|
}
|
|
|
|
void erase_nodes(node_pointer i, node_pointer j)
|
|
{
|
|
std::size_t bucket_index = this->hash_to_bucket(i->hash_);
|
|
|
|
// Find the node before i.
|
|
link_pointer prev = this->get_previous_start(bucket_index);
|
|
while(prev->next_ != i) prev = prev->next_;
|
|
|
|
// Delete the nodes.
|
|
do {
|
|
this->delete_node(prev);
|
|
bucket_index = this->fix_bucket(bucket_index, prev);
|
|
} while (prev->next_ != j);
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// fill_buckets
|
|
|
|
template <class NodeCreator>
|
|
static void fill_buckets(iterator n, table& dst,
|
|
NodeCreator& creator)
|
|
{
|
|
link_pointer prev = dst.get_previous_start();
|
|
|
|
while (n.node_) {
|
|
node_pointer node = creator.create(*n);
|
|
node->hash_ = n.node_->hash_;
|
|
prev->next_ = node;
|
|
++dst.size_;
|
|
++n;
|
|
|
|
prev = place_in_bucket(dst, prev);
|
|
}
|
|
}
|
|
|
|
// strong otherwise exception safety
|
|
void rehash_impl(std::size_t num_buckets)
|
|
{
|
|
BOOST_ASSERT(this->buckets_);
|
|
|
|
this->create_buckets(num_buckets);
|
|
link_pointer prev = this->get_previous_start();
|
|
while (prev->next_)
|
|
prev = place_in_bucket(*this, prev);
|
|
}
|
|
|
|
// Iterate through the nodes placing them in the correct buckets.
|
|
// pre: prev->next_ is not null.
|
|
static link_pointer place_in_bucket(table& dst, link_pointer prev)
|
|
{
|
|
node_pointer n = static_cast<node_pointer>(prev->next_);
|
|
bucket_pointer b = dst.get_bucket(dst.hash_to_bucket(n->hash_));
|
|
|
|
if (!b->next_) {
|
|
b->next_ = prev;
|
|
return n;
|
|
}
|
|
else {
|
|
prev->next_ = n->next_;
|
|
n->next_ = b->next_->next_;
|
|
b->next_->next_ = n;
|
|
return prev;
|
|
}
|
|
}
|
|
};
|
|
}}}
|
|
|
|
#endif
|