/****************************************************************************
** Copyright (C) 2001-2007 Klarälvdalens Datakonsult AB.  All rights reserved.
**
** This file is part of the KD Tools library.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid commercial KD Tools licenses may use this file in
** accordance with the KD Tools Commercial License Agreement provided with
** the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Contact info@klaralvdalens-datakonsult.se if any conditions of this
** licensing are not clear to you.
**
**********************************************************************/
#ifndef __KDTOOLSCORE_STL_UTIL_H__
#define __KDTOOLSCORE_STL_UTIL_H__

#include <boost/range.hpp>
#include <boost/iterator/filter_iterator.hpp>
#include <boost/iterator/transform_iterator.hpp>
#include <boost/call_traits.hpp>
#include <boost/version.hpp>

#include <algorithm>
#include <numeric>
#include <utility>
#include <iterator>
#include <functional>

namespace kdtools {

    struct nodelete {
        template <typename T>
        void operator()( const T * ) const {}
    };

    struct identity {
        template <typename T>
        T * operator()( T * t ) const { return t; }
        template <typename T>
        const T * operator()( const T * t ) const { return t; }
        template <typename T>
        T & operator()( T & t ) const { return t; }
        template <typename T>
        const T & operator()( const T & t ) const { return t; }
    };

    template <typename Pair>
    struct select1st;

    template <typename U, typename V>
    struct select1st< std::pair<U,V> >
        : std::unary_function<std::pair<U,V>,U>
    {
        typename boost::call_traits<U>::param_type
        operator()( const std::pair<U,V> & pair ) const { return pair.first; }
    };
        
    template <typename Pair>
    struct select2nd;

    template <typename U, typename V>
    struct select2nd< std::pair<U,V> >
        : std::unary_function<std::pair<U,V>,V>
    {
        typename boost::call_traits<V>::param_type
        operator()( const std::pair<U,V> & pair ) const { return pair.second; }
    };


    template <typename InputIterator, typename OutputIterator, typename UnaryPredicate>
    OutputIterator copy_if( InputIterator first, InputIterator last, OutputIterator dest, UnaryPredicate pred ) {
        while ( first != last ) {
            if ( pred( *first ) ) {
                *dest = *first;
                ++dest;
            }
            ++first;
        }
        return dest;
    }

    template <typename OutputIterator, typename InputIterator, typename UnaryFunction, typename UnaryPredicate>
    OutputIterator transform_if( InputIterator first, InputIterator last, OutputIterator dest, UnaryPredicate pred, UnaryFunction filter ) {
        return std::transform( boost::make_filter_iterator( filter, first, last ),
                               boost::make_filter_iterator( filter, last,  last ),
                               dest, pred );
    }

    template <typename InputIterator, typename OutputIterator>
    OutputIterator copy_1st( InputIterator first, InputIterator last, OutputIterator dest ) {
        return std::copy( boost::make_transform_iterator( first, select1st<typename std::iterator_traits<InputIterator>::value_type>() ),
                          boost::make_transform_iterator( last,  select1st<typename std::iterator_traits<InputIterator>::value_type>() ),
                          dest );
    }

    template <typename InputIterator, typename OutputIterator>
    OutputIterator copy_2nd( InputIterator first, InputIterator last, OutputIterator dest ) {
        return std::copy( boost::make_transform_iterator( first, select2nd<typename std::iterator_traits<InputIterator>::value_type>() ),
                          boost::make_transform_iterator( last,  select2nd<typename std::iterator_traits<InputIterator>::value_type>() ),
                          dest );
    }

    template <typename InputIterator, typename OutputIterator, typename Predicate>
    OutputIterator copy_1st_if( InputIterator first, InputIterator last, OutputIterator dest, Predicate pred ) {
        return kdtools::copy_if( boost::make_transform_iterator( first, select1st<typename std::iterator_traits<InputIterator>::value_type>() ),
                                 boost::make_transform_iterator( last,  select1st<typename std::iterator_traits<InputIterator>::value_type>() ),
                                 dest, pred );
    }

    template <typename InputIterator, typename OutputIterator, typename Predicate>
    OutputIterator copy_2nd_if( InputIterator first, InputIterator last, OutputIterator dest, Predicate pred ) {
        return kdtools::copy_if( boost::make_transform_iterator( first, select2nd<typename std::iterator_traits<InputIterator>::value_type>() ),
                                 boost::make_transform_iterator( last,  select2nd<typename std::iterator_traits<InputIterator>::value_type>() ),
                                 dest, pred );
    }

    template <typename OutputIterator, typename InputIterator, typename UnaryFunction>
    OutputIterator transform_1st( InputIterator first, InputIterator last, OutputIterator dest, UnaryFunction func ) {
        return std::transform( boost::make_transform_iterator( first, select1st<typename std::iterator_traits<InputIterator>::value_type>() ),
                               boost::make_transform_iterator( last,  select1st<typename std::iterator_traits<InputIterator>::value_type>() ),
                               dest, func );
    }

    template <typename OutputIterator, typename InputIterator, typename UnaryFunction>
    OutputIterator transform_2nd( InputIterator first, InputIterator last, OutputIterator dest, UnaryFunction func ) {
        return std::transform( boost::make_transform_iterator( first, select2nd<typename std::iterator_traits<InputIterator>::value_type>() ),
                               boost::make_transform_iterator( last,  select2nd<typename std::iterator_traits<InputIterator>::value_type>() ),
                               dest, func );
    }

    template <typename Value, typename InputIterator, typename UnaryPredicate>
    Value accumulate_if( InputIterator first, InputIterator last, UnaryPredicate filter, const Value & value=Value() ) {
        return std::accumulate( boost::make_filter_iterator( filter, first, last ),
                                boost::make_filter_iterator( filter, last,  last ), value );
    }

    template <typename Value, typename InputIterator, typename UnaryPredicate, typename BinaryOperation>
    Value accumulate_if( InputIterator first, InputIterator last, UnaryPredicate filter, const Value & value, BinaryOperation op ) {
        return std::accumulate( boost::make_filter_iterator( filter, first, last ),
                                boost::make_filter_iterator( filter, last,  last ), value, op );
    }

    template <typename Value, typename InputIterator, typename UnaryFunction>
    Value accumulate_transform( InputIterator first, InputIterator last, UnaryFunction map, const Value & value=Value() ) {
        return std::accumulate( boost::make_transform_iterator( first, map ),
                                boost::make_transform_iterator( last, map ), value );
    }

    template <typename Value, typename InputIterator, typename UnaryFunction, typename BinaryOperation>
    Value accumulate_transform( InputIterator first, InputIterator last, UnaryFunction map, const Value & value, BinaryOperation op ) {
        return std::accumulate( boost::make_transform_iterator( first, map ),
                                boost::make_transform_iterator( last, map ), value, op );
    }

    template <typename Value, typename InputIterator, typename UnaryFunction, typename UnaryPredicate>
    Value accumulate_transform_if( InputIterator first, InputIterator last, UnaryFunction map, UnaryPredicate pred, const Value & value=Value() ) {
        return std::accumulate( boost::make_transform_iterator( first, map ),
                                boost::make_transform_iterator( last, map ), value );
    }

    template <typename Value, typename InputIterator, typename UnaryFunction, typename UnaryPredicate, typename BinaryOperation>
    Value accumulate_transform_if( InputIterator first, InputIterator last, UnaryFunction map, UnaryPredicate filter, const Value & value, BinaryOperation op ) {
        return std::accumulate( boost::make_transform_iterator( boost::make_filter_iterator( filter, first, last ), map ),
                                boost::make_transform_iterator( boost::make_filter_iterator( filter, last, last ), map ), value, op );
    }

    template <typename InputIterator, typename OutputIterator1, typename OutputIterator2, typename UnaryPredicate>
    std::pair<OutputIterator1,OutputIterator2> separate_if( InputIterator first, InputIterator last, OutputIterator1 dest1, OutputIterator2 dest2, UnaryPredicate pred ) {
        while ( first != last ) {
            if ( pred( *first ) ) {
                *dest1 = *first;
                ++dest1;
            } else {
                *dest2 = *first;
                ++dest2;
            }
            ++first;
        }
        return std::make_pair( dest1, dest2 );
    }

    template <typename InputIterator>
    bool any( InputIterator first, InputIterator last ) {
        while ( first != last )
            if ( *first )
                return true;
            else
                ++first;
        return false;
    }

    template <typename InputIterator, typename UnaryPredicate>
    bool any( InputIterator first, InputIterator last, UnaryPredicate pred ) {
        while ( first != last )
            if ( pred( *first ) )
                return true;
            else
                ++first;
        return false;
    }

    template <typename InputIterator>
    bool all( InputIterator first, InputIterator last ) {
        while ( first != last )
            if ( *first )
                ++first;
            else
                return false;
        return true;
    }

    template <typename InputIterator, typename UnaryPredicate>
    bool all( InputIterator first, InputIterator last, UnaryPredicate pred ) {
        while ( first != last )
            if ( pred( *first ) )
                ++first;
            else
                return false;
        return true;
    }

    template <typename InputIterator>
    bool none_of( InputIterator first, InputIterator last ) {
        return !any( first, last );
    }

    template <typename InputIterator, typename UnaryPredicate>
    bool none_of( InputIterator first, InputIterator last, UnaryPredicate pred ) {
        return !any( first, last, pred );
    }

    template <typename InputIterator, typename BinaryOperation>
    BinaryOperation for_each_adjacent_pair( InputIterator first, InputIterator last, BinaryOperation op ) {
        typedef typename std::iterator_traits<InputIterator>::value_type ValueType;
        if ( first == last )
            return op;
        ValueType value = *first;
        while ( ++first != last ) {
            ValueType tmp = *first;
            op( value, tmp );
            value = tmp;
        }
        return op;
    }

    template <typename ForwardIterator, typename UnaryPredicate, typename UnaryFunction>
    UnaryFunction for_each_if( ForwardIterator first, ForwardIterator last, UnaryPredicate pred, UnaryFunction func ) {
        return std::for_each( boost::make_filter_iterator( pred, first, last ),
                              boost::make_filter_iterator( pred, last, last ),
                              func );
    }

    //@{
    /**
       Versions of std::set_intersection optimized for ForwardIterator's
    */
    template <typename ForwardIterator, typename ForwardIterator2, typename OutputIterator, typename BinaryPredicate>
    OutputIterator set_intersection( ForwardIterator first1, ForwardIterator last1, ForwardIterator2 first2, ForwardIterator2 last2, OutputIterator result ) {
        while ( first1 != last1 && first2 != last2 ) {
            if ( *first1 < *first2 ) {
                first1 = std::lower_bound( ++first1, last1, *first2 );
            } else if ( *first2 < *first1 ) {
                first2 = std::lower_bound( ++first2, last2, *first1 );
            } else {
                *result = *first1;
                ++first1;
                ++first2;
                ++result;
            }
        }
        return result;
    }

    template <typename ForwardIterator, typename ForwardIterator2, typename OutputIterator, typename BinaryPredicate>
    OutputIterator set_intersection( ForwardIterator first1, ForwardIterator last1, ForwardIterator2 first2, ForwardIterator2 last2, OutputIterator result, BinaryPredicate pred ) {
        while ( first1 != last1 && first2 != last2 ) {
            if ( pred( *first1, *first2 ) ) {
                first1 = std::lower_bound( ++first1, last1, *first2, pred );
            } else if ( pred( *first2, *first1 ) ) {
                first2 = std::lower_bound( ++first2, last2, *first1, pred );
            } else {
                *result = *first1;
                ++first1;
                ++first2;
                ++result;
            }
        }
        return result;
    }
    //@}

    template <typename ForwardIterator, typename ForwardIterator2, typename BinaryPredicate>
        bool set_intersects( ForwardIterator first1,  ForwardIterator last1,
                             ForwardIterator2 first2, ForwardIterator2 last2,
                             BinaryPredicate pred )
    {
        while ( first1 != last1 && first2 != last2 ) {
            if ( pred( *first1, *first2 ) ) {
                first1 = std::lower_bound( ++first1, last1, *first2, pred );
            } else if ( pred( *first2, *first1 ) ) {
                first2 = std::lower_bound( ++first2, last2, *first1, pred );
            } else {
                return true;
            }
        }
        return false;
    }

    //@{
    /*! Versions of std algorithms that take ranges */

    template <typename C, typename V>
    typename boost::range_iterator<C>::type
    find( C & c, const V & v ) {
        return std::find( boost::begin( c ), boost::end( c ), v );
    }

#if BOOST_VERSION < 103500
    template <typename C, typename V>
    typename boost::range_const_iterator<C>::type
    find( const C & c, const V & v ) {
        return std::find( boost::begin( c ), boost::end( c ), v );
    }
#endif

    template <typename C, typename P>
    typename boost::range_iterator<C>::type
    find_if( C & c, P p ) {
        return std::find_if( boost::begin( c ), boost::end( c ), p );
    }

#if BOOST_VERSION < 103500
    template <typename C, typename P>
    typename boost::range_const_iterator<C>::type
    find_if( const C & c, P p ) {
        return std::find_if( boost::begin( c ), boost::end( c ), p );
    }
#endif

    template <typename C, typename V>
    bool contains( const C & c, const V & v ) {
        return find( c, v ) != boost::end( c ) ;
    }

    template <typename C, typename P>
    bool contains_if( const C & c, P p ) {
        return find_if( c, p ) != boost::end( c );
    }

    template <typename C, typename V>
    bool binary_search( const C & c, const V & v ) {
        return std::binary_search( boost::begin( c ), boost::end( c ), v );
    }

    template <typename C, typename V>
    size_t count( const C & c, const V & v ) {
        return std::count( boost::begin( c ), boost::end( c ), v );
    }

    template <typename C, typename P>
    size_t count_if( const C & c, P p ) {
        return std::count_if( boost::begin( c ), boost::end( c ), p );
    }

    template <typename O, typename I, typename P>
    O transform( const I & i, P p ) {
        O o;
        std::transform( boost::begin( i ), boost::end( i ),
                        std::back_inserter( o ), p );
        return o;
    }

    template <typename I, typename OutputIterator, typename P>
    OutputIterator transform( const I & i, OutputIterator out, P p ) {
        return std::transform( boost::begin( i ), boost::end( i ), out, p );
    }

    template <typename O, typename I, typename P, typename F>
    O transform_if( const I & i, P p, F f ) {
        O o;
        transform_if( boost::begin( i ), boost::end( i ),
                      std::back_inserter( o ), p, f );
        return o;
    }

    template <typename V, typename I, typename F>
    V accumulate_if( const I & i, F f, V v=V() ) {
        return accumulate_if( boost::begin( i ), boost::end( i ), f, v );
    }

    template <typename V, typename I, typename F, typename B>
        V accumulate_if( const I & i, F f, V v, B b ) {
        return accumulate_if( boost::begin( i ), boost::end( i ), f, v, b );
    }

    template <typename V, typename I, typename F>
    V accumulate_transform( const I & i, F f, V v=V() ) {
        return accumulate_transform( boost::begin( i ), boost::end( i ), f, v );
    }

    template <typename V, typename I, typename F, typename B>
    V accumulate_transform( const I & i, F f, V v, B b ) {
        return accumulate_transform( boost::begin( i ), boost::end( i ), f, v, b );
    }

    template <typename V, typename I, typename F, typename P>
    V accumulate_transform_if( const I & i, F f, P p, V v=V() ) {
        return accumulate_transform_if( boost::begin( i ), boost::end( i ), f, p, v );
    }

    template <typename V, typename I, typename F, typename P, typename B>
    V accumulate_transform_if( const I & i, F f, P p, V v, B b ) {
        return accumulate_transform_if( boost::begin( i ), boost::end( i ), f, p, v, b );
    }

    template <typename O, typename I>
    O copy( const I & i ) {
        O o;
        std::copy( boost::begin( i ), boost::end( i ), std::back_inserter( o ) );
        return o;
    }

    template <typename O, typename I, typename P>
    O copy_if( const I & i, P p ) {
        O o;
        kdtools::copy_if( boost::begin( i ), boost::end( i ), std::back_inserter( o ), p );
        return o;
    }

    template <typename I, typename P>
    P for_each( const I & i, P p ) {
        return std::for_each( boost::begin( i ), boost::end( i ), p );
    }

    template <typename I, typename P>
    P for_each( I & i, P p ) {
        return std::for_each( boost::begin( i ), boost::end( i ), p );
    }

    template <typename C1, typename C2>
    bool equal( const C1 & c1, const C2 & c2 ) {
        return boost::size( c1 ) == boost::size( c2 )
            && std::equal( boost::begin( c1 ), boost::end( c1 ),
                           boost::begin( c2 ) );
    }

    template <typename C1, typename C2, typename P>
    bool equal( const C1 & c1, const C2 & c2, P p ) {
        return boost::size( c1 ) == boost::size( c2 )
            && std::equal( boost::begin( c1 ), boost::end( c1 ),
                           boost::begin( c2 ), p );
    }

    template <typename C, typename O1, typename O2, typename P>
    std::pair<O1,O2> separate_if( const C & c, O1 o1, O2 o2, P p ) {
        return separate_if( boost::begin( c ), boost::end( c ), o1, o2, p );
    }

    //@}

    template <typename C>
    bool any( const C & c ) {
        return any( boost::begin( c ), boost::end( c ) );
    }

    template <typename C, typename P>
    bool any( const C & c, P p ) {
        return any( boost::begin( c ), boost::end( c ), p );
    }

    template <typename C>
    bool all( const C & c ) {
        return all( boost::begin( c ), boost::end( c ) );
    }

    template <typename C, typename P>
    bool all( const C & c, P p ) {
        return all( boost::begin( c ), boost::end( c ), p );
    }

    template <typename C>
    bool none_of( const C & c ) {
        return none_of( boost::begin( c ), boost::end( c ) );
    }

    template <typename C, typename P>
    bool none_of( const C & c, P p ) {
        return kdtools::none_of( boost::begin( c ), boost::end( c ), p );
    }

    template <typename C, typename B>
    B for_each_adjacent_pair( const C & c, B b ) {
        return for_each_adjacent_pair( boost::begin( c ), boost::end( c ), b );
    }

    template <typename C, typename B>
    B for_each_adjacent_pair( C & c, B b ) {
        return for_each_adjacent_pair( boost::begin( c ), boost::end( c ), b );
    }

    template <typename C, typename P, typename F>
    P for_each_if( const C & c, P p, F f ) {
        return for_each_if( boost::begin( c ), boost::end( c ), p, f );
    }

    template <typename C, typename P, typename F>
    P for_each_if( C & c, P p, F f ) {
        return for_each_if( boost::begin( c ), boost::end( c ), p, f );
    }

    template <typename C>
    void sort( C & c ) {
        return std::sort( boost::begin( c ), boost::end( c ) );
    }

    template <typename C, typename P>
    void sort( C & c, P p ) {
        return std::sort( boost::begin( c ), boost::end( c ), p );
    }

    template <typename C>
    C sorted( const C & c ) {
        C copy( c );
        kdtools::sort( copy );
        return copy;
    }

    template <typename C, typename P>
    C sorted( const C & c, P p ) {
        C copy( c );
        kdtools::sort( copy, p );
        return copy;
    }

}

#endif /* __KDTOOLSCORE_STL_UTIL_H__ */