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 //  Boost string_algo library collection_traits.hpp header file  -----------------------//
 
 //  Copyright Pavol Droba 2002-2003. Use, modification and
 //  distribution is subject to 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 for updates, documentation, and revision history.
 
 #ifndef BOOST_RANGE_STRING_DETAIL_COLLECTION_TRAITS_HPP
 #define BOOST_RANGE_STRING_DETAIL_COLLECTION_TRAITS_HPP
 
 #include <cstddef>
 #include <string>
 #include <utility>
 #include <iterator>
 #include <boost/type_traits/is_array.hpp>
 #include <boost/type_traits/is_pointer.hpp>
 #include <boost/type_traits/is_const.hpp>
 #include <boost/type_traits/is_convertible.hpp>
 #include <boost/type_traits/remove_pointer.hpp>
 #include <boost/type_traits/remove_cv.hpp>
 #include <boost/mpl/eval_if.hpp>
 #include <boost/mpl/identity.hpp>
 #include <boost/mpl/vector.hpp>
 #include <boost/mpl/fold.hpp>
 
 // Container traits implementation ---------------------------------------------------------
 
 namespace boost {
     namespace algorithm {
         namespace detail {
 
 // Default collection traits -----------------------------------------------------------------
 
             // Default collection helper 
             /*
                 Wraps std::container compliant containers
             */
             template< typename ContainerT >
             struct default_container_traits
             {
                 typedef typename ContainerT::value_type value_type;
                 typedef typename ContainerT::iterator iterator;
                 typedef typename ContainerT::const_iterator const_iterator;
                 typedef typename
                     ::boost::mpl::if_< ::boost::is_const<ContainerT>,
                         const_iterator,
                         iterator 
                     >::type result_iterator;
                 typedef typename ContainerT::difference_type difference_type;
                 typedef typename ContainerT::size_type size_type;
 
                 // static operations
                 template< typename C >
                 static size_type size( const C& c )
                 {
                     return c.size();
                 }
 
                 template< typename C >
                 static bool empty( const C& c )
                 {
                     return c.empty();
                 }
 
                 template< typename C >
                 static iterator begin( C& c )
                 {
                     return c.begin();
                 }
 
                 template< typename C >
                 static const_iterator begin( const C& c )
                 {
                     return c.begin();
                 }
 
                 template< typename C >
                 static iterator end( C& c )
                 {
                     return c.end();
                 }
 
                 template< typename C >
                 static const_iterator end( const C& c )
                 {
                     return c.end();
                 }
 
             }; 
 
             template<typename T>
             struct default_container_traits_selector
             {
                 typedef default_container_traits<T> type;
             };
 
 // Pair container traits ---------------------------------------------------------------------
 
             typedef double yes_type;
             typedef char no_type;
 
             // pair selector
             template< typename T, typename U >
             yes_type is_pair_impl( const std::pair<T,U>* );
             no_type is_pair_impl( ... );
 
             template<typename T> struct is_pair
             {
             private:
                 static T* t;
             public:
                 BOOST_STATIC_CONSTANT( bool, value=
                     sizeof(is_pair_impl(t))==sizeof(yes_type) );
             };
 
             // pair helper
             template< typename PairT >
             struct pair_container_traits
             {
                 typedef typename PairT::first_type element_type;
 
                 typedef typename
                     std::iterator_traits<element_type>::value_type value_type;
                 typedef std::size_t size_type;
                 typedef typename
                     std::iterator_traits<element_type>::difference_type difference_type;
 
                 typedef element_type iterator;
                 typedef element_type const_iterator;
                 typedef element_type result_iterator;
 
                 // static operations
                 template< typename P >
                 static size_type size( const P& p )
                 {
                     difference_type diff = std::distance( p.first, p.second );
                     if ( diff < 0 ) 
                         return 0;
                     else
                         return diff;
                 }
 
                 template< typename P >
                 static bool empty( const P& p )
                 {
                     return p.first==p.second;
                 }
 
                 template< typename P > 
                 static const_iterator begin( const P& p )
                 {
                     return p.first;
                 }
 
                 template< typename P >
                 static const_iterator end( const P& p )
                 {
                     return p.second;
                 }
             }; // 'pair_container_helper'
 
             template<typename T>
             struct pair_container_traits_selector
             {
                 typedef pair_container_traits<T> type;
             };
 
 // Array container traits ---------------------------------------------------------------
 
             // array traits ( partial specialization )
             template< typename T >
             struct array_traits;
 
             template< typename T, std::size_t sz >
             struct array_traits<T[sz]>
             {
                 // typedef
                 typedef T* iterator;
                 typedef const T* const_iterator;
                 typedef T value_type;
                 typedef std::size_t size_type;
                 typedef std::ptrdiff_t difference_type;
 
                 // size of the array ( static );
                 BOOST_STATIC_CONSTANT( size_type, array_size = sz );
             };
 
 
             // array length resolving
             /*
                 Lenght of string contained in a static array could
                 be different from the size of the array.
                 For string processing we need the length without
                 terminating 0.
 
                 Therefore, the length is calculated for char and wchar_t
                 using char_traits, rather then simply returning
                 the array size.
             */
             template< typename T >
             struct array_length_selector
             {
                 template< typename TraitsT >
                 struct array_length
                 {
                     typedef typename
                         TraitsT::size_type size_type;
 
                     BOOST_STATIC_CONSTANT(
                         size_type,
                         array_size=TraitsT::array_size );
 
                     template< typename A >
                     static size_type length( const A& )
                     {
                         return array_size;
                     }
 
                     template< typename A >
                     static bool empty( const A& )
                     {
                         return array_size==0;
                     }
                 };
             };
 
             // specialization for char
             template<>
             struct array_length_selector<char>
             {
                 template< typename TraitsT >
                 struct array_length
                 {
                     typedef typename
                         TraitsT::size_type size_type;
 
                     template< typename A >
                     static size_type length( const A& a )
                     {
                         if ( a==0 ) 
                             return 0;
                         else
                             return std::char_traits<char>::length(a);
                     }
 
                     template< typename A >
                     static bool empty( const A& a )
                     {
                         return a==0 || a[0]==0;
                     }
                 };
             };
 
             // specialization for wchar_t
             template<>
             struct array_length_selector<wchar_t>
             {
                 template< typename TraitsT >
                 struct array_length
                 {
                     typedef typename
                         TraitsT::size_type size_type;
 
                     template< typename A >
                     static size_type length( const A& a )
                     {
                         if ( a==0 ) 
                             return 0;
                         else
                             return std::char_traits<wchar_t>::length(a);
                     }
 
                     template< typename A >
                     static bool empty( const A& a )
                     {
                         return a==0 || a[0]==0;
                     }
                 };
             };
 
             template< typename T >
             struct array_container_traits
             {
             private:
                 // resolve array traits
                 typedef array_traits<T> traits_type;
 
             public:
                 typedef typename
                     traits_type::value_type value_type;
                 typedef typename
                     traits_type::iterator iterator;
                 typedef typename
                     traits_type::const_iterator const_iterator;
                 typedef typename
                     traits_type::size_type size_type;
                 typedef typename
                     traits_type::difference_type difference_type;
 
                 typedef typename
                     ::boost::mpl::if_< ::boost::is_const<T>,
                         const_iterator,
                         iterator 
                     >::type result_iterator;
 
             private:
                 // resolve array size
                 typedef typename
                     ::boost::remove_cv<value_type>::type char_type;
                 typedef typename
                     array_length_selector<char_type>::
                         BOOST_NESTED_TEMPLATE array_length<traits_type> array_length_type;
 
             public:
                 BOOST_STATIC_CONSTANT( size_type, array_size = traits_type::array_size );
 
                 // static operations
                 template< typename A >
                 static size_type size( const A& a )
                 {
                     return array_length_type::length(a);
                 }
 
                 template< typename A >
                 static bool empty( const A& a )
                 {
                     return array_length_type::empty(a);
                 }
 
 
                 template< typename A >
                 static iterator begin( A& a )
                 {
                     return a;
                 }
 
                 template< typename A >
                 static const_iterator begin( const A& a )
                 {
                     return a;
                 }
 
                 template< typename A >
                 static iterator end( A& a )
                 {
                     return a+array_length_type::length(a);
                 }
 
                 template< typename A >
                 static const_iterator end( const A& a )
                 {
                     return a+array_length_type::length(a);
                 }
 
             }; 
 
             template<typename T>
             struct array_container_traits_selector
             {
                 typedef array_container_traits<T> type;
             };
 
 // Pointer container traits ---------------------------------------------------------------
 
             template<typename T>
             struct pointer_container_traits
             {
                 typedef typename
                     ::boost::remove_pointer<T>::type value_type;
 
                 typedef typename
                     ::boost::remove_cv<value_type>::type char_type;
                 typedef ::std::char_traits<char_type> char_traits;
 
                 typedef value_type* iterator;
                 typedef const value_type* const_iterator;
                 typedef std::ptrdiff_t difference_type;
                 typedef std::size_t size_type;
 
                 typedef typename
                     ::boost::mpl::if_< ::boost::is_const<T>,
                         const_iterator,
                         iterator 
                     >::type result_iterator;
 
                 // static operations
                 template< typename P >
                 static size_type size( const P& p )
                 {
                     if ( p==0 ) 
                         return 0;
                     else
                         return char_traits::length(p);
                 }
 
                 template< typename P >
                 static bool empty( const P& p )
                 {
                     return p==0 || p[0]==0;
                 }
 
                 template< typename P >
                 static iterator begin( P& p )
                 {
                     return p;
                 }
 
                 template< typename P >
                 static const_iterator begin( const P& p )
                 {
                     return p;
                 }
 
                 template< typename P >
                 static iterator end( P& p )
                 {
                     if ( p==0 )
                         return p;
                     else
                         return p+char_traits::length(p);
                 }
 
                 template< typename P >
                 static const_iterator end( const P& p )
                 {
                     if ( p==0 )
                         return p;
                     else
                         return p+char_traits::length(p);
                 }
 
             }; 
 
             template<typename T>
             struct pointer_container_traits_selector
             {
                 typedef pointer_container_traits<T> type;
             };
 
         } // namespace detail
     } // namespace algorithm
 } // namespace boost
 
 
 #endif  // BOOST_STRING_DETAIL_COLLECTION_HPP

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