TypeList.h

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/*
 *  BEEN: Benchmarking Environment
 *  ==============================
 *
 *  File author: Branislav Repcek
 *
 *  GNU Lesser General Public License Version 2.1
 *  ---------------------------------------------
 *  Copyright (C) 2004-2006 Distributed Systems Research Group,
 *  Faculty of Mathematics and Physics, Charles University in Prague
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License version 2.1, as published by the Free Software Foundation.
 *
 *  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., 59 Temple Place, Suite 330, Boston,
 *  MA  02111-1307  USA
 */

#ifndef TYPE_LIST_INCLUDED
#define TYPE_LIST_INCLUDED

namespace tl
{

    class NullType
    {
    };

    template< typename H, class T >
    class TypeList
    {
    public:
        typedef H Head;

        typedef T Tail;
    };

    /*
     * ListLength - calculate length of the list.
     */

    template< class List >
    class ListLength;

    template< class H, class T >
    class ListLength< TypeList< H, T > >
    {
    public:
        enum
        {
            Length = 1 + ListLength< T >::Length
        };
    };

    template< >
    class ListLength< NullType >
    {
    public:
        enum
        {
            Length = 0
        };
    };

    /*
     * Get - Select element from TypeList based on its index.
     */

    template< class List, size_t i > 
    class Get;

    template< class H, class T >
    class Get< TypeList< H, T >, 0 >
    {
    public:
        typedef H Result;
    };

    template< class H, class T, size_t i >
    class Get< TypeList< H, T >, i >
    {
    public:
        typedef typename Get< T, i - 1 >::Result Result;
    };

    /*
     * IndexOf - Find if given type is in TypeList and return its index.
     */

    template< class Tlist, class T > class IndexOf;

    template< class T >
    struct IndexOf< NullType, T >
    {
        enum
        {
            value = -1 
        };
    };

    template< class T, class Tail >
    struct IndexOf< TypeList< T, Tail >, T >
    {
        enum
        {
            value = 0
        };
    };

    template< class Head, class Tail, class T >
    struct IndexOf< TypeList< Head, Tail >, T >
    {
    private:
        enum
        {
            temp = IndexOf< Tail, T >::value
        };

    public:
        enum
        {
            value = (temp == - 1) ? -1 : temp + 1
        };
    };

} // namespace tl

#define CREATE_TYPE_LIST_01(T01) ::tl::TypeList< T01, ::tl::NullType >

#define CREATE_TYPE_LIST_02(T01, T02) ::tl::TypeList< T01, CREATE_TYPE_LIST_01(T02) >

#define CREATE_TYPE_LIST_03(T01, T02, T03) ::tl::TypeList< T01, CREATE_TYPE_LIST_02(T02, T03) >

#define CREATE_TYPE_LIST_04(T01, T02, T03, T04) ::tl::TypeList< T01, CREATE_TYPE_LIST_03(T02, T03, T04) >

#define CREATE_TYPE_LIST_05(T01, T02, T03, T04, T05) \
            ::tl::TypeList< T01, CREATE_TYPE_LIST_04(T02, T03, T04, T05) >

#define CREATE_TYPE_LIST_06(T01, T02, T03, T04, T05, T06) \
            ::tl::TypeList< T01, CREATE_TYPE_LIST_05(T02, T03, T04, T05, T06) >

#define CREATE_TYPE_LIST_07(T01, T02, T03, T04, T05, T06, T07) \
            ::tl::TypeList< T01, CREATE_TYPE_LIST_06(T02, T03, T04, T05, T06, T07) >

#define CREATE_TYPE_LIST_08(T01, T02, T03, T04, T05, T06, T07, T08) \
            ::tl::TypeList< T01, CREATE_TYPE_LIST_07(T02, T03, T04, T05, T06, T07, T08) >

#define CREATE_TYPE_LIST_09(T01, T02, T03, T04, T05, T06, T07, T08, T09) \
            ::tl::TypeList< T01, CREATE_TYPE_LIST_08(T02, T03, T04, T05, T06, T07, T08, T09) >

#define CREATE_TYPE_LIST_10(T01, T02, T03, T04, T05, T06, T07, T08, T09, T10) \
            ::tl::TypeList< T01, CREATE_TYPE_LIST_09(T02, T03, T04, T05, T06, T07, T08, T09, T10) >

#define CREATE_TYPE_LIST_11(T01, T02, T03, T04, T05, T06, T07, T08, T09, T10, T11) \
    ::tl::TypeList< T01, CREATE_TYPE_LIST_10(T02, T03, T04, T05, T06, T07, T08, T09, T10, T11) >

#define CREATE_TYPE_LIST_12(T01, T02, T03, T04, T05, T06, T07, T08, T09, T10, T11, T12) \
    ::tl::TypeList< T01, CREATE_TYPE_LIST_11(T02, T03, T04, T05, T06, T07, T08, T09, T10, T11, T12) >

#endif

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