typelist.h

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// -*- C++ -*-
// $Id: typelist.h,v 3.0 2006/04/03 04:58:44 edwards Exp $
/*! @file
 * @brief Typelist support
 */

#ifndef __typelist_h__
#define __typelist_h__

#include "typemanip.h"

namespace Chroma
{

////////////////////////////////////////////////////////////////////////////////
// class EmptyType
// Used as a class type that doesn't hold anything
// Useful as a strawman class
////////////////////////////////////////////////////////////////////////////////

    class EmptyType {};

////////////////////////////////////////////////////////////////////////////////
// class NullType
// Used as a placeholder for "no type here"
// Useful as an end marker in typelists 
////////////////////////////////////////////////////////////////////////////////

    class NullType {};

}  // namespace Chroma


////////////////////////////////////////////////////////////////////////////////
// macros TYPELIST_1, TYPELIST_2, ... TYPELIST_50
// Each takes a number of arguments equal to its numeric suffix
// The arguments are type names. TYPELIST_NN generates a typelist containing 
//     all types passed as arguments, in that order.
// Example: TYPELIST_2(char, int) generates a type containing char and int.
////////////////////////////////////////////////////////////////////////////////

#define TYPELIST_1(T1) ::Chroma::Typelist<T1, ::Chroma::NullType>

#define TYPELIST_2(T1, T2) ::Chroma::Typelist<T1, TYPELIST_1(T2) >

#define TYPELIST_3(T1, T2, T3) ::Chroma::Typelist<T1, TYPELIST_2(T2, T3) >

#define TYPELIST_4(T1, T2, T3, T4) \
    ::Chroma::Typelist<T1, TYPELIST_3(T2, T3, T4) >

#define TYPELIST_5(T1, T2, T3, T4, T5) \
    ::Chroma::Typelist<T1, TYPELIST_4(T2, T3, T4, T5) >

#define TYPELIST_6(T1, T2, T3, T4, T5, T6) \
    ::Chroma::Typelist<T1, TYPELIST_5(T2, T3, T4, T5, T6) >

#define TYPELIST_7(T1, T2, T3, T4, T5, T6, T7) \
    ::Chroma::Typelist<T1, TYPELIST_6(T2, T3, T4, T5, T6, T7) >

#define TYPELIST_8(T1, T2, T3, T4, T5, T6, T7, T8) \
    ::Chroma::Typelist<T1, TYPELIST_7(T2, T3, T4, T5, T6, T7, T8) >

#define TYPELIST_9(T1, T2, T3, T4, T5, T6, T7, T8, T9) \
    ::Chroma::Typelist<T1, TYPELIST_8(T2, T3, T4, T5, T6, T7, T8, T9) >

#define TYPELIST_10(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10) \
    ::Chroma::Typelist<T1, TYPELIST_9(T2, T3, T4, T5, T6, T7, T8, T9, T10) >

#define TYPELIST_11(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11) \
    ::Chroma::Typelist<T1, TYPELIST_10(T2, T3, T4, T5, T6, T7, T8, T9, T10, T11) >

#define TYPELIST_12(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12) \
    ::Chroma::Typelist<T1, TYPELIST_11(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12) >

#define TYPELIST_13(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13) \
    ::Chroma::Typelist<T1, TYPELIST_12(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13) >

#define TYPELIST_14(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14) \
    ::Chroma::Typelist<T1, TYPELIST_13(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14) >

#define TYPELIST_15(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15) \
    ::Chroma::Typelist<T1, TYPELIST_14(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15) >

#define TYPELIST_16(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16) \
    ::Chroma::Typelist<T1, TYPELIST_15(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16) >

#define TYPELIST_17(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17) \
    ::Chroma::Typelist<T1, TYPELIST_16(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17) >

#define TYPELIST_18(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18) \
    ::Chroma::Typelist<T1, TYPELIST_17(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18) >

#define TYPELIST_19(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19) \
    ::Chroma::Typelist<T1, TYPELIST_18(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19) >

#define TYPELIST_20(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20) \
    ::Chroma::Typelist<T1, TYPELIST_19(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20) >

#define TYPELIST_21(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21) \
    ::Chroma::Typelist<T1, TYPELIST_20(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21) >

#define TYPELIST_22(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22) \
    ::Chroma::Typelist<T1, TYPELIST_21(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22) >

#define TYPELIST_23(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23) \
    ::Chroma::Typelist<T1, TYPELIST_22(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23) >

#define TYPELIST_24(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24) \
    ::Chroma::Typelist<T1, TYPELIST_23(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24) >

#define TYPELIST_25(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25) \
    ::Chroma::Typelist<T1, TYPELIST_24(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25) >

#define TYPELIST_26(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26) \
    ::Chroma::Typelist<T1, TYPELIST_25(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26) >

#define TYPELIST_27(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27) \
    ::Chroma::Typelist<T1, TYPELIST_26(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27) >

#define TYPELIST_28(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28) \
    ::Chroma::Typelist<T1, TYPELIST_27(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28) >

#define TYPELIST_29(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29) \
    ::Chroma::Typelist<T1, TYPELIST_28(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29) >

#define TYPELIST_30(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30) \
    ::Chroma::Typelist<T1, TYPELIST_29(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30) >

#define TYPELIST_31(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31) \
    ::Chroma::Typelist<T1, TYPELIST_30(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31) >

#define TYPELIST_32(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31, T32) \
    ::Chroma::Typelist<T1, TYPELIST_31(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31, T32) >

#define TYPELIST_33(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31, T32, T33) \
    ::Chroma::Typelist<T1, TYPELIST_32(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31, T32, T33) >

#define TYPELIST_34(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31, T32, T33, T34) \
    ::Chroma::Typelist<T1, TYPELIST_33(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31, T32, T33, T34) >

#define TYPELIST_35(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35) \
    ::Chroma::Typelist<T1, TYPELIST_34(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35) >

#define TYPELIST_36(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36) \
    ::Chroma::Typelist<T1, TYPELIST_35(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36) >

#define TYPELIST_37(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37) \
    ::Chroma::Typelist<T1, TYPELIST_36(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37) >

#define TYPELIST_38(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38) \
    ::Chroma::Typelist<T1, TYPELIST_37(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38) >

#define TYPELIST_39(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39) \
    ::Chroma::Typelist<T1, TYPELIST_38(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39) >

#define TYPELIST_40(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40) \
    ::Chroma::Typelist<T1, TYPELIST_39(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40) >

#define TYPELIST_41(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, T41) \
    ::Chroma::Typelist<T1, TYPELIST_40(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, T41) >

#define TYPELIST_42(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, T41, T42) \
    ::Chroma::Typelist<T1, TYPELIST_41(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, T41, T42) >

#define TYPELIST_43(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, T41, T42, T43) \
    ::Chroma::Typelist<T1, TYPELIST_42(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, T41, T42, T43) >

#define TYPELIST_44(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, T41, T42, T43, T44) \
    ::Chroma::Typelist<T1, TYPELIST_43(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, T41, T42, T43, T44) >

#define TYPELIST_45(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45) \
    ::Chroma::Typelist<T1, TYPELIST_44(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45) >

#define TYPELIST_46(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45, T46) \
    ::Chroma::Typelist<T1, TYPELIST_45(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45) >

#define TYPELIST_47(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45, T46, T47) \
    ::Chroma::Typelist<T1, TYPELIST_46(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45, T46, T47) >

#define TYPELIST_48(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45, T46, T47, T48) \
    ::Chroma::Typelist<T1, TYPELIST_47(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45, T46, T47, T48) >

#define TYPELIST_49(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45, T46, T47, T48, T49) \
    ::Chroma::Typelist<T1, TYPELIST_48(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45, T46, T47, T48, T49) >

#define TYPELIST_50(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45, T46, T47, T48, T49, T50) \
    ::Chroma::Typelist<T1, TYPELIST_49(T2, T3, T4, T5, T6, T7, T8, T9, T10, \
        T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, \
        T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, \
        T31, T32, T33, T34, T35, T36, T37, T38, T39, T40, \
        T41, T42, T43, T44, T45, T46, T47, T48, T49, T50) >

namespace Chroma
{
////////////////////////////////////////////////////////////////////////////////
// class template Typelist
// The building block of typelists of any length
// Use it through the TYPELIST_NN macros
// Defines nested types:
//     Head (first element, a non-typelist type by convention)
//     Tail (second element, can be another typelist)
////////////////////////////////////////////////////////////////////////////////

  template <class T, class U>
  struct Typelist
  {
    typedef T Head;
    typedef U Tail;
  };

  namespace TL
  {
////////////////////////////////////////////////////////////////////////////////
// class template Length
// Computes the length of a typelist
// Invocation (TList is a typelist):
// Length<TList>::value
// returns a compile-time constant containing the length of TList, not counting
//     the end terminator (which by convention is NullType)
////////////////////////////////////////////////////////////////////////////////

    template <class TList> struct Length;
    template <> struct Length<NullType>
    {
      enum { value = 0 };
    };
        
    template <class T, class U>
    struct Length< Typelist<T, U> >
    {
      enum { value = 1 + Length<U>::value };
    };

////////////////////////////////////////////////////////////////////////////////
// class template TypeAt
// Finds the type at a given index in a typelist
// Invocation (TList is a typelist and index is a compile-time integral 
//     constant):
// TypeAt<TList, index>::Result
// returns the type in position 'index' in TList
// If you pass an out-of-bounds index, the result is a compile-time error
////////////////////////////////////////////////////////////////////////////////

    template <class TList, int index> struct TypeAt;
        
    template <class Head, class Tail>
    struct TypeAt<Typelist<Head, Tail>, 0>
    {
      typedef Head Result;
    };

    template <class Head, class Tail, int i>
    struct TypeAt<Typelist<Head, Tail>, i>
    {
      typedef typename TypeAt<Tail, i - 1>::Result Result;
    };

////////////////////////////////////////////////////////////////////////////////
// class template TypeAtNonStrict
// Finds the type at a given index in a typelist
// Invocations (TList is a typelist and index is a compile-time integral 
//     constant):
// a) TypeAt<TList, index>::Result
// returns the type in position 'index' in TList, or NullType if index is 
//     out-of-bounds
// b) TypeAt<TList, index, D>::Result
// returns the type in position 'index' in TList, or D if index is out-of-bounds
////////////////////////////////////////////////////////////////////////////////

    template <class TList, int index,
      typename DefaultType = NullType>
    struct TypeAtNonStrict
    {
      typedef DefaultType Result;
    };
        
    template <class Head, class Tail, typename DefaultType>
    struct TypeAtNonStrict<Typelist<Head, Tail>, 0, DefaultType>
    {
      typedef Head Result;
    };
        
    template <class Head, class Tail, int i, typename DefaultType>
    struct TypeAtNonStrict<Typelist<Head, Tail>, i, DefaultType>
    {
      typedef typename 
      TypeAtNonStrict<Tail, i - 1, DefaultType>::Result Result;
    };

////////////////////////////////////////////////////////////////////////////////
// class template IndexOf
// Finds the index of a type in a typelist
// Invocation (TList is a typelist and T is a type):
// IndexOf<TList, T>::value
// returns the position of T in TList, or NullType if T is not found in TList
////////////////////////////////////////////////////////////////////////////////

    template <class TList, class T> struct 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 : 1 + temp) };
    };

////////////////////////////////////////////////////////////////////////////////
// class template Append
// Appends a type or a typelist to another
// Invocation (TList is a typelist and T is either a type or a typelist):
// Append<TList, T>::Result
// returns a typelist that is TList followed by T and NullType-terminated
////////////////////////////////////////////////////////////////////////////////

    template <class TList, class T> struct Append;
        
    template <> struct Append<NullType, NullType>
    {
      typedef NullType Result;
    };
        
    template <class T> struct Append<NullType, T>
    {
      typedef TYPELIST_1(T) Result;
    };
        
    template <class Head, class Tail>
    struct Append<NullType, Typelist<Head, Tail> >
    {
      typedef Typelist<Head, Tail> Result;
    };
        
    template <class Head, class Tail, class T>
    struct Append<Typelist<Head, Tail>, T>
    {
      typedef Typelist<Head, 
        typename Append<Tail, T>::Result>
      Result;
    };
        
////////////////////////////////////////////////////////////////////////////////
// class template Erase
// Erases the first occurence, if any, of a type in a typelist
// Invocation (TList is a typelist and T is a type):
// Erase<TList, T>::Result
// returns a typelist that is TList without the first occurence of T
////////////////////////////////////////////////////////////////////////////////

    template <class TList, class T> struct Erase;
        
    template <class T>                         // Specialization 1
    struct Erase<NullType, T>
    {
      typedef NullType Result;
    };

    template <class T, class Tail>             // Specialization 2
    struct Erase<Typelist<T, Tail>, T>
    {
      typedef Tail Result;
    };

    template <class Head, class Tail, class T> // Specialization 3
    struct Erase<Typelist<Head, Tail>, T>
    {
      typedef Typelist<Head, 
        typename Erase<Tail, T>::Result>
      Result;
    };

////////////////////////////////////////////////////////////////////////////////
// class template EraseAll
// Erases all first occurences, if any, of a type in a typelist
// Invocation (TList is a typelist and T is a type):
// EraseAll<TList, T>::Result
// returns a typelist that is TList without any occurence of T
////////////////////////////////////////////////////////////////////////////////

    template <class TList, class T> struct EraseAll;
    template <class T>
    struct EraseAll<NullType, T>
    {
      typedef NullType Result;
    };
    template <class T, class Tail>
    struct EraseAll<Typelist<T, Tail>, T>
    {
      // Go all the way down the list removing the type
      typedef typename EraseAll<Tail, T>::Result Result;
    };
    template <class Head, class Tail, class T>
    struct EraseAll<Typelist<Head, Tail>, T>
    {
      // Go all the way down the list removing the type
      typedef Typelist<Head, 
        typename EraseAll<Tail, T>::Result>
      Result;
    };

////////////////////////////////////////////////////////////////////////////////
// class template NoDuplicates
// Removes all duplicate types in a typelist
// Invocation (TList is a typelist):
// NoDuplicates<TList, T>::Result
////////////////////////////////////////////////////////////////////////////////

    template <class TList> struct NoDuplicates;
        
    template <> struct NoDuplicates<NullType>
    {
      typedef NullType Result;
    };

    template <class Head, class Tail>
    struct NoDuplicates< Typelist<Head, Tail> >
    {
    private:
      typedef typename NoDuplicates<Tail>::Result L1;
      typedef typename Erase<L1, Head>::Result L2;
    public:
      typedef Typelist<Head, L2> Result;
    };

////////////////////////////////////////////////////////////////////////////////
// class template Replace
// Replaces the first occurence of a type in a typelist, with another type
// Invocation (TList is a typelist, T, U are types):
// Replace<TList, T, U>::Result
// returns a typelist in which the first occurence of T is replaced with U
////////////////////////////////////////////////////////////////////////////////

    template <class TList, class T, class U> struct Replace;
        
    template <class T, class U>
    struct Replace<NullType, T, U>
    {
      typedef NullType Result;
    };

    template <class T, class Tail, class U>
    struct Replace<Typelist<T, Tail>, T, U>
    {
      typedef Typelist<U, Tail> Result;
    };

    template <class Head, class Tail, class T, class U>
    struct Replace<Typelist<Head, Tail>, T, U>
    {
      typedef Typelist<Head,
        typename Replace<Tail, T, U>::Result>
      Result;
    };

////////////////////////////////////////////////////////////////////////////////
// class template ReplaceAll
// Replaces all occurences of a type in a typelist, with another type
// Invocation (TList is a typelist, T, U are types):
// Replace<TList, T, U>::Result
// returns a typelist in which all occurences of T is replaced with U
////////////////////////////////////////////////////////////////////////////////

    template <class TList, class T, class U> struct ReplaceAll;
        
    template <class T, class U>
    struct ReplaceAll<NullType, T, U>
    {
      typedef NullType Result;
    };
        
    template <class T, class Tail, class U>
    struct ReplaceAll<Typelist<T, Tail>, T, U>
    {
      typedef Typelist<U, typename ReplaceAll<Tail, T, U>::Result> Result;
    };
        
    template <class Head, class Tail, class T, class U>
    struct ReplaceAll<Typelist<Head, Tail>, T, U>
    {
      typedef Typelist<Head,
        typename ReplaceAll<Tail, T, U>::Result>
      Result;
    };

////////////////////////////////////////////////////////////////////////////////
// class template Reverse
// Reverses a typelist
// Invocation (TList is a typelist):
// Reverse<TList>::Result
// returns a typelist that is TList reversed
////////////////////////////////////////////////////////////////////////////////

    template <class TList> struct Reverse;
        
    template <class T>
    struct Reverse< TYPELIST_1(T) >
    {
      typedef TYPELIST_1(T) Result;
    };
        
    template <class Head, class Tail>
    struct Reverse< Typelist<Head, Tail> >
    {
      typedef typename Append<
      typename Reverse<Tail>::Result, Head>::Result Result;
    };

////////////////////////////////////////////////////////////////////////////////
// class template MostDerived
// Finds the type in a typelist that is the most derived from a given type
// Invocation (TList is a typelist, T is a type):
// Replace<TList, T>::Result
// returns the type in TList that's the most derived from T
////////////////////////////////////////////////////////////////////////////////

    template <class TList, class T> struct MostDerived;
        
    template <class T>
    struct MostDerived<NullType, T>
    {
      typedef T Result;
    };
        
    template <class Head, class Tail, class T>
    struct MostDerived<Typelist<Head, Tail>, T>
    {
    private:
      typedef typename MostDerived<Tail, T>::Result Candidate;
    public:
      typedef typename Select<
      SUPERSUBCLASS(Candidate, Head),
        Head, Candidate>::Result Result;
    };

////////////////////////////////////////////////////////////////////////////////
// class template DerivedToFront
// Arranges the types in a typelist so that the most derived types appear first
// Invocation (TList is a typelist):
// DerivedToFront<TList>::Result
// returns the reordered TList 
////////////////////////////////////////////////////////////////////////////////

    template <class TList> struct DerivedToFront;
        
    template <>
    struct DerivedToFront<NullType>
    {
      typedef NullType Result;
    };
        
    template <class Head, class Tail>
    struct DerivedToFront< Typelist<Head, Tail> >
    {
    private:
      typedef typename MostDerived<Tail, Head>::Result
      TheMostDerived;
      typedef typename Replace<Tail, 
        TheMostDerived, Head>::Result L;
    public:
      typedef Typelist<TheMostDerived, L> Result;
    };
        
  }   // namespace TL
}   // namespace Chroma

#endif

---