forked from boostorg/unordered
308 lines
11 KiB
C++
308 lines
11 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_EQUIVALENT_HPP_INCLUDED
|
|
#define BOOST_UNORDERED_DETAIL_EQUIVALENT_HPP_INCLUDED
|
|
|
|
#include <boost/unordered/detail/extract_key.hpp>
|
|
|
|
namespace boost { namespace unordered { namespace detail {
|
|
|
|
template <class T>
|
|
class equivalent_table : public T::table_base
|
|
{
|
|
public:
|
|
typedef BOOST_DEDUCED_TYPENAME T::hasher hasher;
|
|
typedef BOOST_DEDUCED_TYPENAME T::key_equal key_equal;
|
|
typedef BOOST_DEDUCED_TYPENAME T::value_allocator value_allocator;
|
|
typedef BOOST_DEDUCED_TYPENAME T::key_type key_type;
|
|
typedef BOOST_DEDUCED_TYPENAME T::value_type value_type;
|
|
typedef BOOST_DEDUCED_TYPENAME T::table_base table_base;
|
|
typedef BOOST_DEDUCED_TYPENAME T::node_constructor node_constructor;
|
|
typedef BOOST_DEDUCED_TYPENAME T::node_allocator node_allocator;
|
|
|
|
typedef BOOST_DEDUCED_TYPENAME T::node node;
|
|
typedef BOOST_DEDUCED_TYPENAME T::node_ptr node_ptr;
|
|
typedef BOOST_DEDUCED_TYPENAME T::bucket_ptr bucket_ptr;
|
|
typedef BOOST_DEDUCED_TYPENAME T::extractor extractor;
|
|
|
|
// Constructors
|
|
|
|
equivalent_table(std::size_t n,
|
|
hasher const& hf, key_equal const& eq, value_allocator const& a)
|
|
: table_base(n, hf, eq, a) {}
|
|
equivalent_table(equivalent_table const& x)
|
|
: table_base(x,
|
|
allocator_traits<node_allocator>::
|
|
select_on_container_copy_construction(x.node_alloc())) {}
|
|
equivalent_table(equivalent_table const& x,
|
|
value_allocator const& a)
|
|
: table_base(x, a) {}
|
|
equivalent_table(equivalent_table& x, move_tag m)
|
|
: table_base(x, m) {}
|
|
equivalent_table(equivalent_table& x,
|
|
value_allocator const& a, move_tag m)
|
|
: table_base(x, a, m) {}
|
|
~equivalent_table() {}
|
|
|
|
// Equality
|
|
|
|
bool equals(equivalent_table const& other) const
|
|
{
|
|
if(this->size_ != other.size_) return false;
|
|
if(!this->size_) return true;
|
|
|
|
for(node_ptr n1 = this->buckets_[this->bucket_count_].next_; n1;)
|
|
{
|
|
node_ptr n2 = other.find_matching_node(n1);
|
|
if (!n2) return false;
|
|
node_ptr end1 = node::next_group(n1);
|
|
node_ptr end2 = node::next_group(n2);
|
|
if (!group_equals(n1, end1, n2, end2)) return false;
|
|
n1 = end1;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool group_equals(node_ptr n1, node_ptr end1,
|
|
node_ptr n2, node_ptr end2)
|
|
{
|
|
for(;;)
|
|
{
|
|
if (node::get_value(n1) != node::get_value(n2))
|
|
break;
|
|
|
|
n1 = n1->next_;
|
|
n2 = n2->next_;
|
|
|
|
if (n1 == end1) return n2 == end2;
|
|
if (n2 == end2) return false;
|
|
}
|
|
|
|
for(node_ptr n1a = n1, n2a = n2;;)
|
|
{
|
|
n1a = n1a->next_;
|
|
n2a = n2a->next_;
|
|
|
|
if (n1a == end1)
|
|
{
|
|
if (n2a == end2) break;
|
|
else return false;
|
|
}
|
|
if (n2a == end2) return false;
|
|
}
|
|
|
|
node_ptr start = n1;
|
|
for(;n1 != end2; n1 = n1->next_)
|
|
{
|
|
value_type const& v = node::get_value(n1);
|
|
if (find(start, n1, v)) continue;
|
|
std::size_t matches = count_equal(n2, end2, v);
|
|
if (!matches || matches != 1 + count_equal(n1->next_, end1, v))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool find(node_ptr n, node_ptr end, value_type const& v)
|
|
{
|
|
for(;n != end; n = n->next_)
|
|
if (node::get_value(n) == v)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static std::size_t count_equal(node_ptr n, node_ptr end, value_type const& v)
|
|
{
|
|
std::size_t count = 0;
|
|
for(;n != end; n = n->next_)
|
|
if (node::get_value(n) == v) ++count;
|
|
return count;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// A convenience method for adding nodes.
|
|
|
|
inline node_ptr add_node(
|
|
node_constructor& a,
|
|
std::size_t bucket_index,
|
|
std::size_t hash,
|
|
node_ptr pos)
|
|
{
|
|
node_ptr n = a.release();
|
|
node::set_hash(n, hash);
|
|
|
|
if(BOOST_UNORDERED_BORLAND_BOOL(pos)) {
|
|
node::add_after_node(n, pos);
|
|
if (n->next_) {
|
|
std::size_t next_bucket =
|
|
node::get_hash(n->next_) % this->bucket_count_;
|
|
if (next_bucket != bucket_index) {
|
|
this->buckets_[next_bucket].next_ = n;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
bucket_ptr b = this->get_bucket(bucket_index);
|
|
|
|
if (!b->next_)
|
|
{
|
|
bucket_ptr start_node =
|
|
this->get_bucket(this->bucket_count_);
|
|
|
|
if (BOOST_UNORDERED_BORLAND_BOOL(start_node->next_)) {
|
|
this->buckets_[
|
|
node::get_hash(start_node->next_) %
|
|
this->bucket_count_].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 n;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// Insert methods
|
|
|
|
node_ptr emplace_impl(node_constructor& a)
|
|
{
|
|
key_type const& k = this->get_key(a.value());
|
|
std::size_t hash = this->hash_function()(k);
|
|
std::size_t bucket_index = hash % this->bucket_count_;
|
|
node_ptr position = this->find_node(bucket_index, hash, k);
|
|
|
|
// reserve has basic exception safety if the hash function
|
|
// throws, strong otherwise.
|
|
if(this->reserve_for_insert(this->size_ + 1)) {
|
|
bucket_index = hash % this->bucket_count_;
|
|
}
|
|
|
|
return add_node(a, bucket_index, hash, position);
|
|
}
|
|
|
|
void emplace_impl_no_rehash(node_constructor& a)
|
|
{
|
|
key_type const& k = this->get_key(a.value());
|
|
std::size_t hash = this->hash_function()(k);
|
|
std::size_t bucket_index = hash % this->bucket_count_;
|
|
add_node(a, bucket_index, hash,
|
|
this->find_node(bucket_index, hash, k));
|
|
}
|
|
|
|
#if defined(BOOST_UNORDERED_STD_FORWARD_MOVE)
|
|
|
|
template <class... Args>
|
|
node_ptr emplace(Args&&... args)
|
|
{
|
|
// Create the node before rehashing in case it throws an
|
|
// exception (need strong safety in such a case).
|
|
node_constructor a(*this);
|
|
a.construct(std::forward<Args>(args)...);
|
|
|
|
return emplace_impl(a);
|
|
}
|
|
|
|
#else
|
|
|
|
#define BOOST_UNORDERED_INSERT_IMPL(z, num_params, _) \
|
|
template <BOOST_UNORDERED_TEMPLATE_ARGS(z, num_params)> \
|
|
node_ptr emplace(BOOST_UNORDERED_FUNCTION_PARAMS(z, num_params)) \
|
|
{ \
|
|
node_constructor a(*this); \
|
|
a.construct(BOOST_UNORDERED_CALL_PARAMS(z, num_params)); \
|
|
return emplace_impl(a); \
|
|
}
|
|
|
|
BOOST_PP_REPEAT_FROM_TO(1, BOOST_UNORDERED_EMPLACE_LIMIT,
|
|
BOOST_UNORDERED_INSERT_IMPL, _)
|
|
|
|
#undef BOOST_UNORDERED_INSERT_IMPL
|
|
#endif
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// Insert range methods
|
|
|
|
// if hash function throws, or inserting > 1 element, basic exception
|
|
// safety. Strong otherwise
|
|
template <class I>
|
|
void insert_for_range(I i, I j, forward_traversal_tag)
|
|
{
|
|
if(i == j) return;
|
|
std::size_t distance = ::boost::unordered::detail::distance(i, j);
|
|
if(distance == 1) {
|
|
emplace(*i);
|
|
}
|
|
else {
|
|
// Only require basic exception safety here
|
|
this->reserve_for_insert(this->size_ + distance);
|
|
|
|
node_constructor a(*this);
|
|
for (; i != j; ++i) {
|
|
a.construct(*i);
|
|
emplace_impl_no_rehash(a);
|
|
}
|
|
}
|
|
}
|
|
|
|
template <class I>
|
|
void insert_for_range(I i, I j, ::boost::incrementable_traversal_tag)
|
|
{
|
|
node_constructor a(*this);
|
|
for (; i != j; ++i) {
|
|
a.construct(*i);
|
|
emplace_impl(a);
|
|
}
|
|
}
|
|
|
|
// If hash function throws, or inserting > 1 element, basic exception
|
|
// safety. Strong otherwise
|
|
template <class I>
|
|
void insert_range(I i, I j)
|
|
{
|
|
BOOST_DEDUCED_TYPENAME ::boost::iterator_traversal<I>::type
|
|
iterator_traversal_tag;
|
|
insert_for_range(i, j, iterator_traversal_tag);
|
|
}
|
|
|
|
};
|
|
|
|
template <class H, class P, class A>
|
|
struct multiset : public types<
|
|
BOOST_DEDUCED_TYPENAME allocator_traits<A>::value_type,
|
|
BOOST_DEDUCED_TYPENAME allocator_traits<A>::value_type,
|
|
H, P, A,
|
|
set_extractor<BOOST_DEDUCED_TYPENAME allocator_traits<A>::value_type>,
|
|
false>
|
|
{
|
|
typedef equivalent_table<multiset<H, P, A> > impl;
|
|
typedef table<multiset<H, P, A> > table_base;
|
|
};
|
|
|
|
template <class K, class H, class P, class A>
|
|
struct multimap : public types<
|
|
K, BOOST_DEDUCED_TYPENAME allocator_traits<A>::value_type,
|
|
H, P, A,
|
|
map_extractor<K, BOOST_DEDUCED_TYPENAME allocator_traits<A>::value_type>,
|
|
false>
|
|
{
|
|
typedef equivalent_table<multimap<K, H, P, A> > impl;
|
|
typedef table<multimap<K, H, P, A> > table_base;
|
|
};
|
|
}}}
|
|
|
|
#endif
|