/usr/include/claw/meta/type_list.hpp is in libclaw-dev 1.7.3-2.
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CLAW - a C++ Library Absolutely Wonderful
CLAW is a free library without any particular aim but being useful to
anyone.
Copyright (C) 2005-2011 Julien Jorge
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
contact: julien.jorge@gamned.org
*/
/**
* \file type_list.hpp
* \brief Template classes for lists of types.
* \author Julien Jorge
*/
#ifndef __CLAW_TYPE_LIST_HPP__
#define __CLAW_TYPE_LIST_HPP__
#include <claw/meta/conditional.hpp>
#include <claw/meta/no_type.hpp>
#include <claw/meta/same_type.hpp>
namespace claw
{
namespace meta
{
/**
* \brief Use this class to make a list of types.
*
* \b Template \b parameters
* - \a Head The first type of the list.
* - \a Queue A list of the remaining types.
*
* All type_list methods suppose that the list ends withe the type no_type.
*
* \b Example
*
* <tt> type_list< int, typelist<float, no_type> ></tt> is a list of two
* types. The last type (<tt>no_type</tt>) is used to indicate the end of
* the list.
*
* \author Julien Jorge
*/
template<typename Head, typename Queue>
struct type_list
{
/** \brief The first type in the list. */
typedef Head head_type;
/** \brief The remaining types in the list. */
typedef Queue queue_type;
}; // struct type_list
/**
* \brief Split a type_list according to the first instance of a given type.
*
* \b Template \b parameters
* - \a Delimiter The type on which we split the list
* - \a TypeList The type_list to split.
*/
template<typename Delimiter, typename TypeList>
struct split_type_list_at;
/** \brief Specialisation of split_type_list_at for an empty list or the
case where the delimiter is no_type. */
template<typename Delimiter>
struct split_type_list_at<Delimiter, no_type>
{
/** \brief There is no left part if there is no list. */
typedef no_type left_part_type;
/** \brief There is no right part if there is no list. */
typedef no_type right_part_type;
}; // struct split_type_list_at
/**
* \brief Split a type_list according to the first instance of a given type.
*
* \b Template \b parameters
* - \a Delimiter The type on which we split the list
* - \a TypeList The type_list to split.
*/
template<typename Delimiter, typename TypeList>
struct split_type_list_at
{
/** \brief The left part of the list. The delimiter is not included. */
typedef typename if_then_else
< same_type<Delimiter, typename TypeList::head_type>::result,
no_type, /* delimiter is found, mark the end of the list. */
type_list /* otherwise, cut in the remaining types. */
< typename TypeList::head_type,
typename split_type_list_at
<Delimiter, typename TypeList::queue_type>::left_part_type > >::result
left_part_type;
/** \brief The right part of the list. The delimiter is included. */
typedef typename if_then_else
< same_type<Delimiter, typename TypeList::head_type>::result,
TypeList, /* delimiter is found, this is the right part. */
typename split_type_list_at
<Delimiter, typename TypeList::queue_type>::right_part_type >::result
right_part_type;
}; // struct split_type_list_at
/**
* \brief A type list with a single type, more readable than an imbricated
* type_list.
*/
template<typename T1>
struct type_list_maker_1
{
/** \brief The list described by this implementation. */
typedef type_list<T1, no_type> result;
}; // struct type_list_maker_1
/**
* \brief A type list with two types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2>
struct type_list_maker_2
{
/** \brief The list described by this implementation. */
typedef type_list< T1, typename type_list_maker_1<T2>::result > result;
}; // struct type_list_maker_2
/**
* \brief A type list with three types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3>
struct type_list_maker_3
{
/** \brief The list described by this implementation. */
typedef
type_list< T1, typename type_list_maker_2<T2, T3>::result > result;
}; // struct type_list_maker_3
/**
* \brief A type list with four types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4>
struct type_list_maker_4
{
/** \brief The list described by this implementation. */
typedef
type_list< T1, typename type_list_maker_3<T2, T3, T4>::result > result;
}; // struct type_list_maker_4
/**
* \brief A type list with five types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5>
struct type_list_maker_5
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_4<T2, T3, T4, T5>::result > result;
}; // struct type_list_maker_5
/**
* \brief A type list with six types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6>
struct type_list_maker_6
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_5<T2, T3, T4, T5, T6>::result > result;
}; // struct type_list_maker_6
/**
* \brief A type list with seven types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7>
struct type_list_maker_7
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_6<T2, T3, T4, T5, T6, T7>::result > result;
}; // struct type_list_maker_7
/**
* \brief A type list with height types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7, typename T8>
struct type_list_maker_8
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_7<T2, T3, T4, T5, T6, T7, T8>::result > result;
}; // struct type_list_maker_8
/**
* \brief A type list with nine types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7, typename T8, typename T9>
struct type_list_maker_9
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_8
<T2, T3, T4, T5, T6, T7, T8, T9>::result
> result;
}; // struct type_list_maker_9
/**
* \brief A type list with ten types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7, typename T8, typename T9, typename T10>
struct type_list_maker_10
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_9
<T2, T3, T4, T5, T6, T7, T8, T9, T10>::result
> result;
}; // struct type_list_maker_10
/**
* \brief A type list with eleven types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7, typename T8, typename T9, typename T10,
typename T11>
struct type_list_maker_11
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_10
<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>::result
> result;
}; // struct type_list_maker_11
/**
* \brief A type list with twelve types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7, typename T8, typename T9, typename T10,
typename T11, typename T12>
struct type_list_maker_12
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_11
<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12>::result
> result;
}; // struct type_list_maker_12
/**
* \brief A type list with thirteen types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7, typename T8, typename T9, typename T10,
typename T11, typename T12, typename T13>
struct type_list_maker_13
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_12
<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13>::result
> result;
}; // struct type_list_maker_13
/**
* \brief A type list with fourteen types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7, typename T8, typename T9, typename T10,
typename T11, typename T12, typename T13, typename T14>
struct type_list_maker_14
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_13
<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14>::result
> result;
}; // struct type_list_maker_14
/**
* \brief A type list with fifteen types, more readable than an imbricated
* type_list.
*/
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7, typename T8, typename T9, typename T10,
typename T11, typename T12, typename T13, typename T14,
typename T15>
struct type_list_maker_15
{
/** \brief The list described by this implementation. */
typedef type_list
< T1,
typename type_list_maker_14
<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15>::result
> result;
}; // struct type_list_maker_15
/**
* \brief A type list with up to six types, more readable than an
* imbricated type_list, more readable than type_list_maker_1 and
* others.
*/
template< typename T1, typename T2 = no_type, typename T3 = no_type,
typename T4 = no_type, typename T5 = no_type,
typename T6 = no_type, typename T7 = no_type,
typename T8 = no_type, typename T9 = no_type,
typename T10 = no_type, typename T11 = no_type,
typename T12 = no_type, typename T13 = no_type,
typename T14 = no_type, typename T15 = no_type >
struct type_list_maker
{
/** \brief The list described by this implementation. */
typedef typename split_type_list_at
< no_type,
typename type_list_maker_15
< T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14,
T15 >::result
>::left_part_type result;
}; // struct type_list_maker
/**
* \brief Check if a type is present in a type_list.
*
* \b Template \b paramters
* - \a T The type to find.
* - \a List The list in which we search the type.
*
* \b Type \b requirements
* - \a List is either no_type, either a type_list<> ended with no_type.
*
* \author Julien Jorge
*/
template<typename T, typename List>
struct type_list_find
{
enum
{
result = same_type<T, typename List::head_type>::result
|| type_list_find<T, typename List::queue_type>::result
};
}; // struct type_list_find
template<typename T>
struct type_list_find<T, no_type>
{
enum
{
result = same_type<T, no_type>::result
};
}; // struct type_list_find
/**
* \brief This class checks if each type in a type_list<> is present only
* once.
*
* \author Julien Jorge
*/
template<typename List>
struct type_list_is_a_set
{
enum
{
result = !type_list_find<typename List::head_type,
typename List::queue_type>::result
&& type_list_is_a_set<typename List::queue_type>::result
};
}; // struct type_list_is_a_set
template<>
struct type_list_is_a_set<no_type>
{
enum
{
result = true
};
}; // struct type_list_is_a_set [no_type]
/**
* \brief This class computes the length of a list of types.
*
* \author Julien Jorge
*/
template<typename List>
struct type_list_length
{
enum
{
result = 1 + type_list_length<typename List::queue_type>::result
};
}; // struct type_list_length
template<>
struct type_list_length<no_type>
{
enum
{
result = 0
};
}; // struct type_list_length [no_type]
/**
* \brief Tell if a given type list contains a given type.
* \param T The type to search.
* \param List The list in which the type is searched.
*
* \author Julien Jorge
*/
template<typename T, typename List>
struct type_list_contains;
template<typename T, typename Tail>
struct type_list_contains< T, type_list<T, Tail> >
{
enum
{
result = true
};
}; // struct type_list_contains
template<typename T>
struct type_list_contains< T, no_type >
{
enum
{
result = false
};
}; // struct type_list_contains
template<typename T, typename Head, typename Tail>
struct type_list_contains< T, type_list<Head, Tail> >
{
enum
{
result = type_list_contains<T, Tail>::result
};
}; // struct type_list_contains
/** \brief The list of the types of the C++ language. */
typedef type_list_maker
< signed char, unsigned char,
signed short, unsigned short,
signed int, unsigned int,
signed long, unsigned long,
#ifndef __STRICT_ANSI__
signed long long, unsigned long long,
#endif
float,
double,
long double,
bool >::result cpp_type_list;
} // namespace meta
} // namespace claw
#endif // __CLAW_TYPE_LIST_HPP__
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