boost/unordered/detail/equivalent.hpp
// Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard.
// Copyright (C) 2005-2009 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/table.hpp>
#include <boost/unordered/detail/extract_key.hpp>
namespace boost { namespace unordered_detail {
////////////////////////////////////////////////////////////////////////////
// Equality
template <class H, class P, class A, class K>
bool hash_equivalent_table<H, P, A, K>
::equals(hash_equivalent_table<H, P, A, K> const& other) const
{
if(this->size_ != other.size_) return false;
if(!this->size_) return true;
bucket_ptr end = this->get_bucket(this->bucket_count_);
for(bucket_ptr i = this->cached_begin_bucket_; i != end; ++i)
{
node_ptr it1 = i->next_;
while(BOOST_UNORDERED_BORLAND_BOOL(it1))
{
node_ptr it2 = other.find_iterator(this->get_key_from_ptr(it1));
if(!BOOST_UNORDERED_BORLAND_BOOL(it2)) return false;
node_ptr end1 = node::next_group(it1);
node_ptr end2 = node::next_group(it2);
do {
if(!extractor::compare_mapped(
node::get_value(it1), node::get_value(it2)))
return false;
it1 = it1->next_;
it2 = it2->next_;
} while(it1 != end1 && it2 != end2);
if(it1 != end1 || it2 != end2) return false;
}
}
return true;
}
////////////////////////////////////////////////////////////////////////////
// A convenience method for adding nodes.
template <class H, class P, class A, class K>
inline BOOST_DEDUCED_TYPENAME hash_equivalent_table<H, P, A, K>::node_ptr
hash_equivalent_table<H, P, A, K>
::add_node(node_constructor& a, bucket_ptr bucket, node_ptr pos)
{
node_ptr n = a.release();
if(BOOST_UNORDERED_BORLAND_BOOL(pos)) {
node::add_after_node(n, pos);
}
else {
node::add_to_bucket(n, *bucket);
if(bucket < this->cached_begin_bucket_)
this->cached_begin_bucket_ = bucket;
}
++this->size_;
return n;
}
////////////////////////////////////////////////////////////////////////////
// Insert methods
template <class H, class P, class A, class K>
inline BOOST_DEDUCED_TYPENAME
hash_equivalent_table<H, P, A, K>::iterator_base
hash_equivalent_table<H, P, A, K>::emplace_impl(node_constructor& a)
{
key_type const& k = this->get_key(a.value());
std::size_t hash_value = this->hash_function()(k);
if(!this->size_) {
return this->emplace_empty_impl_with_node(a, 1);
}
else {
bucket_ptr bucket = this->bucket_ptr_from_hash(hash_value);
node_ptr position = this->find_iterator(bucket, k);
// reserve has basic exception safety if the hash function
// throws, strong otherwise.
if(this->reserve_for_insert(this->size_ + 1))
bucket = this->bucket_ptr_from_hash(hash_value);
return iterator_base(bucket, add_node(a, bucket, position));
}
}
template <class H, class P, class A, class K>
inline void hash_equivalent_table<H, P, A, K>
::emplace_impl_no_rehash(node_constructor& a)
{
key_type const& k = this->get_key(a.value());
bucket_ptr bucket = this->get_bucket(this->bucket_index(k));
add_node(a, bucket, this->find_iterator(bucket, k));
}
#if defined(BOOST_UNORDERED_STD_FORWARD)
// Emplace (equivalent key containers)
// (I'm using an overloaded emplace for both 'insert' and 'emplace')
// if hash function throws, basic exception safety
// strong otherwise
template <class H, class P, class A, class K>
template <class... Args>
BOOST_DEDUCED_TYPENAME hash_equivalent_table<H, P, A, K>::iterator_base
hash_equivalent_table<H, P, A, K>
::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 <class H, class P, class A, class K> \
template <BOOST_UNORDERED_TEMPLATE_ARGS(z, num_params)> \
BOOST_DEDUCED_TYPENAME hash_equivalent_table<H, P, A, K>::iterator_base \
hash_equivalent_table<H, P, A, K> \
::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 H, class P, class A, class K>
template <class I>
inline void hash_equivalent_table<H, P, A, K>
::insert_for_range(I i, I j, forward_traversal_tag)
{
if(i == j) return;
std::size_t distance = unordered_detail::distance(i, j);
if(distance == 1) {
emplace(*i);
}
else {
node_constructor a(*this);
// Only require basic exception safety here
if(this->size_) {
this->reserve_for_insert(this->size_ + distance);
}
else {
a.construct(*i++);
this->emplace_empty_impl_with_node(a, distance);
}
for (; i != j; ++i) {
a.construct(*i);
emplace_impl_no_rehash(a);
}
}
}
// if hash function throws, or inserting > 1 element, basic exception safety
// strong otherwise
template <class H, class P, class A, class K>
template <class I>
inline void hash_equivalent_table<H, P, A, K>
::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 H, class P, class A, class K>
template <class I>
void hash_equivalent_table<H, P, A, K>::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);
}
}}
#endif