/usr/include/boost/range/detail/collection_traits_detail.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
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// 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 <boost/algorithm/string/config.hpp>
#include <cstddef>
#include <string>
#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>
#include <boost/detail/iterator.hpp>
#include <boost/algorithm/string/yes_no_type.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 BOOST_STRING_TYPENAME ContainerT::value_type value_type;
typedef BOOST_STRING_TYPENAME ContainerT::iterator iterator;
typedef BOOST_STRING_TYPENAME ContainerT::const_iterator const_iterator;
typedef BOOST_STRING_TYPENAME
::boost::mpl::if_< ::boost::is_const<ContainerT>,
const_iterator,
iterator
>::type result_iterator;
typedef BOOST_STRING_TYPENAME ContainerT::difference_type difference_type;
typedef BOOST_STRING_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();
}
#ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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();
}
#else // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
template< typename C >
static result_iterator begin( C& c )
{
return c.begin();
}
template< typename C >
static result_iterator end( C& c )
{
return c.end();
}
#endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
};
template<typename T>
struct default_container_traits_selector
{
typedef default_container_traits<T> type;
};
// Pair container traits ---------------------------------------------------------------------
// 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 BOOST_STRING_TYPENAME PairT::first_type element_type;
typedef BOOST_STRING_TYPENAME ::boost::detail::
iterator_traits<element_type>::value_type value_type;
typedef std::size_t size_type;
typedef BOOST_STRING_TYPENAME ::boost::detail::
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 ---------------------------------------------------------------
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
// 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 );
};
#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
// array traits ( no partial specialization )
/*
without partial specialization we are able to
provide support only for a limited number of
types. Currently the primitive numeric types
are supported
*/
template< typename T, typename BaseT >
struct array_traits_impl
{
typedef BaseT value_type;
typedef BaseT* iterator;
typedef const BaseT* const_iterator;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
// size of the array
BOOST_STATIC_CONSTANT( size_type, array_size = sizeof(T)/sizeof(BaseT) );
};
template< typename T, typename BaseT >
struct array_traits_impl_selector
{
typedef array_traits_impl<T,BaseT> type;
};
struct array_traits_void
{
typedef void type;
};
template< typename T, typename BaseT >
struct array_traits_cv_selector
{
typedef BOOST_STRING_TYPENAME
::boost::mpl::eval_if<
::boost::is_convertible<T,BaseT*>,
array_traits_impl_selector<T,BaseT>,
::boost::mpl::eval_if<
::boost::is_convertible<T,const BaseT*>,
array_traits_impl_selector<T, const BaseT>,
::boost::mpl::eval_if<
::boost::is_convertible<T, volatile BaseT*>,
array_traits_impl_selector<T, volatile BaseT>,
array_traits_impl_selector<T, const volatile BaseT>
>
>
>::type type;
};
template< typename T >
struct array_traits_select
{
template< typename T1, typename T2 >
struct apply
{
typedef BOOST_STRING_TYPENAME
::boost::mpl::eval_if<
::boost::is_convertible<T,const volatile T2*>,
array_traits_cv_selector<T,T2>,
::boost::mpl::identity<T1> >::type type;
};
};
template< typename T >
struct array_traits_selector
{
private:
// supported array base types
#ifndef BOOST_NO_INTRINSIC_WCHAR_T
typedef BOOST_STRING_TYPENAME
::boost::mpl::vector10<
wchar_t,
#else // BOOST_NO_INTRINSIC_WCHAR_T
typedef BOOST_STRING_TYPENAME
::boost::mpl::vector9<
#endif // BOOST_NO_INTRINSIC_WCHAR_T
char,
signed char,
unsigned char,
signed short,
unsigned short,
signed int,
unsigned int,
signed long,
unsigned long
>::type array_base_types;
public:
typedef BOOST_STRING_TYPENAME
::boost::mpl::fold<
array_base_types,
::boost::algorithm::detail::array_traits_void,
::boost::algorithm::detail::array_traits_select<T> >::type type;
};
template< typename T >
struct array_traits
{
typedef BOOST_STRING_TYPENAME
array_traits_selector<T>::type traits_type;
typedef BOOST_STRING_TYPENAME
traits_type::value_type value_type;
typedef BOOST_STRING_TYPENAME
traits_type::iterator iterator;
typedef BOOST_STRING_TYPENAME
traits_type::const_iterator const_iterator;
typedef BOOST_STRING_TYPENAME
traits_type::size_type size_type;
typedef BOOST_STRING_TYPENAME
traits_type::difference_type difference_type;
BOOST_STATIC_CONSTANT( size_type, array_size = traits_type::array_size );
};
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
// 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 BOOST_STRING_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 BOOST_STRING_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 BOOST_STRING_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 BOOST_STRING_TYPENAME
traits_type::value_type value_type;
typedef BOOST_STRING_TYPENAME
traits_type::iterator iterator;
typedef BOOST_STRING_TYPENAME
traits_type::const_iterator const_iterator;
typedef BOOST_STRING_TYPENAME
traits_type::size_type size_type;
typedef BOOST_STRING_TYPENAME
traits_type::difference_type difference_type;
typedef BOOST_STRING_TYPENAME
::boost::mpl::if_< ::boost::is_const<T>,
const_iterator,
iterator
>::type result_iterator;
private:
// resolve array size
typedef BOOST_STRING_TYPENAME
::boost::remove_cv<value_type>::type char_type;
typedef BOOST_STRING_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);
}
#ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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);
}
#else // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
template< typename A >
static result_iterator begin( A& a )
{
return a;
}
template< typename A >
static result_iterator end( A& a )
{
return a+array_length_type::length(a);
}
#endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
};
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 BOOST_STRING_TYPENAME
::boost::remove_pointer<T>::type value_type;
typedef BOOST_STRING_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 BOOST_STRING_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;
}
#ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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);
}
#else // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
template< typename P >
static result_iterator begin( P& p )
{
return p;
}
template< typename P >
static result_iterator end( P& p )
{
if ( p==0 )
return p;
else
return p+char_traits::length(p);
}
#endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
};
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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