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/* Copyright 2003-2015 Joaquin M Lopez Munoz.
* 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)
*
* See http://www.boost.org/libs/multi_index for library home page.
*/
#ifndef BOOST_MULTI_INDEX_DETAIL_SEQ_INDEX_OPS_HPP
#define BOOST_MULTI_INDEX_DETAIL_SEQ_INDEX_OPS_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
#include <boost/detail/no_exceptions_support.hpp>
#include <boost/multi_index/detail/seq_index_node.hpp>
#include <boost/limits.hpp>
#include <boost/type_traits/aligned_storage.hpp>
#include <boost/type_traits/alignment_of.hpp>
#include <cstddef>
namespace boost{
namespace multi_index{
namespace detail{
/* Common code for sequenced_index memfuns having templatized and
* non-templatized versions.
*/
template <typename SequencedIndex,typename Predicate>
void sequenced_index_remove(SequencedIndex& x,Predicate pred)
{
typedef typename SequencedIndex::iterator iterator;
iterator first=x.begin(),last=x.end();
while(first!=last){
if(pred(*first))x.erase(first++);
else ++first;
}
}
template <typename SequencedIndex,class BinaryPredicate>
void sequenced_index_unique(SequencedIndex& x,BinaryPredicate binary_pred)
{
typedef typename SequencedIndex::iterator iterator;
iterator first=x.begin();
iterator last=x.end();
if(first!=last){
for(iterator middle=first;++middle!=last;middle=first){
if(binary_pred(*middle,*first))x.erase(middle);
else first=middle;
}
}
}
template <typename SequencedIndex,typename Compare>
void sequenced_index_merge(SequencedIndex& x,SequencedIndex& y,Compare comp)
{
typedef typename SequencedIndex::iterator iterator;
if(&x!=&y){
iterator first0=x.begin(),last0=x.end();
iterator first1=y.begin(),last1=y.end();
while(first0!=last0&&first1!=last1){
if(comp(*first1,*first0))x.splice(first0,y,first1++);
else ++first0;
}
x.splice(last0,y,first1,last1);
}
}
/* sorting */
/* auxiliary stuff */
template<typename Node,typename Compare>
void sequenced_index_collate(
BOOST_DEDUCED_TYPENAME Node::impl_type* x,
BOOST_DEDUCED_TYPENAME Node::impl_type* y,
Compare comp)
{
typedef typename Node::impl_type impl_type;
typedef typename Node::impl_pointer impl_pointer;
impl_pointer first0=x->next();
impl_pointer last0=x;
impl_pointer first1=y->next();
impl_pointer last1=y;
while(first0!=last0&&first1!=last1){
if(comp(
Node::from_impl(first1)->value(),Node::from_impl(first0)->value())){
impl_pointer tmp=first1->next();
impl_type::relink(first0,first1);
first1=tmp;
}
else first0=first0->next();
}
impl_type::relink(last0,first1,last1);
}
/* Some versions of CGG require a bogus typename in counter_spc
* inside sequenced_index_sort if the following is defined
* also inside sequenced_index_sort.
*/
BOOST_STATIC_CONSTANT(
std::size_t,
sequenced_index_sort_max_fill=
(std::size_t)std::numeric_limits<std::size_t>::digits+1);
template<typename Node,typename Compare>
void sequenced_index_sort(Node* header,Compare comp)
{
/* Musser's mergesort, see http://www.cs.rpi.edu/~musser/gp/List/lists1.html.
* The implementation is a little convoluted: in the original code
* counter elements and carry are std::lists: here we do not want
* to use multi_index instead, so we do things at a lower level, managing
* directly the internal node representation.
* Incidentally, the implementations I've seen of this algorithm (SGI,
* Dinkumware, STLPort) are not exception-safe: this is. Moreover, we do not
* use any dynamic storage.
*/
if(header->next()==header->impl()||
header->next()->next()==header->impl())return;
typedef typename Node::impl_type impl_type;
typedef typename Node::impl_pointer impl_pointer;
typedef typename aligned_storage<
sizeof(impl_type),
alignment_of<impl_type>::value
>::type carry_spc_type;
carry_spc_type carry_spc;
impl_type& carry=
*reinterpret_cast<impl_type*>(&carry_spc);
typedef typename aligned_storage<
sizeof(
impl_type
[sequenced_index_sort_max_fill]),
alignment_of<
impl_type
[sequenced_index_sort_max_fill]
>::value
>::type counter_spc_type;
counter_spc_type counter_spc;
impl_type* counter=
reinterpret_cast<impl_type*>(&counter_spc);
std::size_t fill=0;
carry.prior()=carry.next()=static_cast<impl_pointer>(&carry);
counter[0].prior()=counter[0].next()=static_cast<impl_pointer>(&counter[0]);
BOOST_TRY{
while(header->next()!=header->impl()){
impl_type::relink(carry.next(),header->next());
std::size_t i=0;
while(i<fill&&counter[i].next()!=static_cast<impl_pointer>(&counter[i])){
sequenced_index_collate<Node>(&carry,&counter[i++],comp);
}
impl_type::swap(
static_cast<impl_pointer>(&carry),
static_cast<impl_pointer>(&counter[i]));
if(i==fill){
++fill;
counter[fill].prior()=counter[fill].next()=
static_cast<impl_pointer>(&counter[fill]);
}
}
for(std::size_t i=1;i<fill;++i){
sequenced_index_collate<Node>(&counter[i],&counter[i-1],comp);
}
impl_type::swap(
header->impl(),static_cast<impl_pointer>(&counter[fill-1]));
}
BOOST_CATCH(...)
{
impl_type::relink(
header->impl(),carry.next(),static_cast<impl_pointer>(&carry));
for(std::size_t i=0;i<=fill;++i){
impl_type::relink(
header->impl(),counter[i].next(),
static_cast<impl_pointer>(&counter[i]));
}
BOOST_RETHROW;
}
BOOST_CATCH_END
}
} /* namespace multi_index::detail */
} /* namespace multi_index */
} /* namespace boost */
#endif
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