267 lines
9.6 KiB
C++
267 lines
9.6 KiB
C++
// 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)
|
|
|
|
// (C) Copyright Thorsten Ottosen 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)
|
|
|
|
// (C) Copyright Jeremy Siek 2001. 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)
|
|
|
|
// Original idea of container traits was proposed by Jeremy Siek and
|
|
// Thorsten Ottosen. This implementation is lightweighted version
|
|
// of container_traits adapter for usage with string_algo library
|
|
|
|
#ifndef BOOST_RANGE_STRING_COLLECTION_TRAITS_HPP
|
|
#define BOOST_RANGE_STRING_COLLECTION_TRAITS_HPP
|
|
|
|
#include <boost/algorithm/string/config.hpp>
|
|
#include <boost/type_traits/is_array.hpp>
|
|
#include <boost/type_traits/is_pointer.hpp>
|
|
#include <boost/mpl/eval_if.hpp>
|
|
|
|
// Implementation
|
|
#include <boost/range/detail/collection_traits_detail.hpp>
|
|
|
|
/*! \file
|
|
Defines collection_traits class and related free-standing functions.
|
|
This facility is used to unify the access to different types of collections.
|
|
It allows the algorithms in the library to work with STL collections, c-style
|
|
array, null-terminated c-strings (and more) using the same interface.
|
|
*/
|
|
|
|
namespace boost {
|
|
namespace algorithm {
|
|
|
|
// collection_traits template class -----------------------------------------//
|
|
|
|
//! collection_traits class
|
|
/*!
|
|
Collection traits provide uniform access to different types of
|
|
collections. This functionality allows to write generic algorithms
|
|
which work with several different kinds of collections.
|
|
|
|
Currently following collection types are supported:
|
|
- containers with STL compatible container interface ( see ContainerConcept )
|
|
( i.e. \c std::vector<>, \c std::list<>, \c std::string<> ... )
|
|
- c-style array
|
|
( \c char[10], \c int[15] ... )
|
|
- null-terminated c-strings
|
|
( \c char*, \c wchar_T* )
|
|
- std::pair of iterators
|
|
( i.e \c std::pair<vector<int>::iterator,vector<int>::iterator> )
|
|
|
|
Collection traits provide an external collection interface operations.
|
|
All are accessible using free-standing functions.
|
|
|
|
The following operations are supported:
|
|
- \c size()
|
|
- \c empty()
|
|
- \c begin()
|
|
- \c end()
|
|
|
|
Container traits have somewhat limited functionality on compilers not
|
|
supporting partial template specialization and partial template ordering.
|
|
*/
|
|
template< typename T >
|
|
struct collection_traits
|
|
{
|
|
private:
|
|
typedef BOOST_STRING_TYPENAME ::boost::mpl::eval_if<
|
|
::boost::algorithm::detail::is_pair<T>,
|
|
detail::pair_container_traits_selector<T>,
|
|
BOOST_STRING_TYPENAME ::boost::mpl::eval_if<
|
|
::boost::is_array<T>,
|
|
detail::array_container_traits_selector<T>,
|
|
BOOST_STRING_TYPENAME ::boost::mpl::eval_if<
|
|
::boost::is_pointer<T>,
|
|
detail::pointer_container_traits_selector<T>,
|
|
detail::default_container_traits_selector<T>
|
|
>
|
|
>
|
|
>::type container_helper_type;
|
|
public:
|
|
//! Function type
|
|
typedef container_helper_type function_type;
|
|
//! Value type
|
|
typedef BOOST_STRING_TYPENAME
|
|
container_helper_type::value_type value_type;
|
|
//! Size type
|
|
typedef BOOST_STRING_TYPENAME
|
|
container_helper_type::size_type size_type;
|
|
//! Iterator type
|
|
typedef BOOST_STRING_TYPENAME
|
|
container_helper_type::iterator iterator;
|
|
//! Const iterator type
|
|
typedef BOOST_STRING_TYPENAME
|
|
container_helper_type::const_iterator const_iterator;
|
|
//! Result iterator type ( iterator of const_iterator, depending on the constness of the container )
|
|
typedef BOOST_STRING_TYPENAME
|
|
container_helper_type::result_iterator result_iterator;
|
|
//! Difference type
|
|
typedef BOOST_STRING_TYPENAME
|
|
container_helper_type::difference_type difference_type;
|
|
|
|
}; // 'collection_traits'
|
|
|
|
// collection_traits metafunctions -----------------------------------------//
|
|
|
|
//! Container value_type trait
|
|
/*!
|
|
Extract the type of elements contained in a container
|
|
*/
|
|
template< typename C >
|
|
struct value_type_of
|
|
{
|
|
typedef BOOST_STRING_TYPENAME collection_traits<C>::value_type type;
|
|
};
|
|
|
|
//! Container difference trait
|
|
/*!
|
|
Extract the container's difference type
|
|
*/
|
|
template< typename C >
|
|
struct difference_type_of
|
|
{
|
|
typedef BOOST_STRING_TYPENAME collection_traits<C>::difference_type type;
|
|
};
|
|
|
|
//! Container iterator trait
|
|
/*!
|
|
Extract the container's iterator type
|
|
*/
|
|
template< typename C >
|
|
struct iterator_of
|
|
{
|
|
typedef BOOST_STRING_TYPENAME collection_traits<C>::iterator type;
|
|
};
|
|
|
|
//! Container const_iterator trait
|
|
/*!
|
|
Extract the container's const_iterator type
|
|
*/
|
|
template< typename C >
|
|
struct const_iterator_of
|
|
{
|
|
typedef BOOST_STRING_TYPENAME collection_traits<C>::const_iterator type;
|
|
};
|
|
|
|
|
|
//! Container result_iterator
|
|
/*!
|
|
Extract the container's result_iterator type. This type maps to \c C::iterator
|
|
for mutable container and \c C::const_iterator for const containers.
|
|
*/
|
|
template< typename C >
|
|
struct result_iterator_of
|
|
{
|
|
typedef BOOST_STRING_TYPENAME collection_traits<C>::result_iterator type;
|
|
};
|
|
|
|
// collection_traits related functions -----------------------------------------//
|
|
|
|
//! Free-standing size() function
|
|
/*!
|
|
Get the size of the container. Uses collection_traits.
|
|
*/
|
|
template< typename C >
|
|
inline BOOST_STRING_TYPENAME collection_traits<C>::size_type
|
|
size( const C& c )
|
|
{
|
|
return collection_traits<C>::function_type::size( c );
|
|
}
|
|
|
|
//! Free-standing empty() function
|
|
/*!
|
|
Check whether the container is empty. Uses container traits.
|
|
*/
|
|
template< typename C >
|
|
inline bool empty( const C& c )
|
|
{
|
|
return collection_traits<C>::function_type::empty( c );
|
|
}
|
|
|
|
#ifndef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
|
|
|
|
//! Free-standing begin() function
|
|
/*!
|
|
Get the begin iterator of the container. Uses collection_traits.
|
|
*/
|
|
template< typename C >
|
|
inline BOOST_STRING_TYPENAME collection_traits<C>::iterator
|
|
begin( C& c )
|
|
{
|
|
return collection_traits<C>::function_type::begin( c );
|
|
}
|
|
|
|
//! Free-standing begin() function
|
|
/*!
|
|
\overload
|
|
*/
|
|
template< typename C >
|
|
inline BOOST_STRING_TYPENAME collection_traits<C>::const_iterator
|
|
begin( const C& c )
|
|
{
|
|
return collection_traits<C>::function_type::begin( c );
|
|
}
|
|
|
|
//! Free-standing end() function
|
|
/*!
|
|
Get the begin iterator of the container. Uses collection_traits.
|
|
*/
|
|
template< typename C >
|
|
inline BOOST_STRING_TYPENAME collection_traits<C>::iterator
|
|
end( C& c )
|
|
{
|
|
return collection_traits<C>::function_type::end( c );
|
|
}
|
|
|
|
//! Free-standing end() function
|
|
/*!
|
|
\overload
|
|
*/
|
|
template< typename C >
|
|
inline BOOST_STRING_TYPENAME collection_traits<C>::const_iterator
|
|
end( const C& c )
|
|
{
|
|
return collection_traits<C>::function_type::end( c );
|
|
}
|
|
|
|
#else // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
|
|
|
|
//! Free-standing begin() function
|
|
/*!
|
|
\overload
|
|
*/
|
|
template< typename C >
|
|
inline BOOST_STRING_TYPENAME collection_traits<C>::result_iterator
|
|
begin( C& c )
|
|
{
|
|
return collection_traits<C>::function_type::begin( c );
|
|
}
|
|
|
|
//! Free-standing end() function
|
|
/*!
|
|
\overload
|
|
*/
|
|
template< typename C >
|
|
inline BOOST_STRING_TYPENAME collection_traits<C>::result_iterator
|
|
end( C& c )
|
|
{
|
|
return collection_traits<C>::function_type::end( c );
|
|
}
|
|
|
|
#endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
|
|
|
|
} // namespace algorithm
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_STRING_COLLECTION_TRAITS_HPP
|