📄 collection_traits_detail.hpp
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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 lenght resolving
/*
Lenght of string contained in a static array could
be different from the size of the array.
For string processing we need the lenght without
terminating 0.
Therefore, the lenght is calulated 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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