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typelist.h

// -*- C++ -*-

// Copyright (C) 2005-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, 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 General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice and
// this permission notice appear in supporting documentation. None of
// the above authors, nor IBM Haifa Research Laboratories, make any
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied warranty.

/**
 *  @file ext/typelist.h
 *  This file is a GNU extension to the Standard C++ Library.
 *
 *  Contains typelist_chain definitions.
 *  Typelists are an idea by Andrei Alexandrescu.
 */

#ifndef _TYPELIST_H
#define _TYPELIST_H 1

#include <ext/type_traits.h>

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/** @namespace __gnu_cxx::typelist
 *  @brief GNU typelist extensions for public compile-time use.
*/
namespace typelist
{
  struct null_type { };

template<typename Root>
    struct node
    {
      typedef Root 	root;
    };

// Forward declarations of functors.
  template<typename Hd, typename Typelist>
    struct chain
    {
      typedef Hd 	head;
      typedef Typelist 	tail;
    };

// Apply all typelist types to unary functor.
  template<typename Fn, typename Typelist>
    void
    apply(Fn&, Typelist);

/// Apply all typelist types to generator functor.
  template<typename Gn, typename Typelist>
    void
    apply_generator(Gn&, Typelist);

// Apply all typelist types and values to generator functor.
  template<typename Gn, typename TypelistT, typename TypelistV>
    void
    apply_generator(Gn&, TypelistT, TypelistV);

template<typename Typelist0, typename Typelist1>
    struct append;

template<typename Typelist_Typelist>
    struct append_typelist;

template<typename Typelist, typename T>
    struct contains;

template<typename Typelist, template<typename T> class Pred>
    struct filter;

template<typename Typelist, int i>
    struct at_index;

template<typename Typelist, template<typename T> class Transform>
    struct transform;

template<typename Typelist_Typelist>
    struct flatten;

template<typename Typelist>
    struct from_first;

template<typename T1>
    struct create1;

template<typename T1, typename T2>
    struct create2;

template<typename T1, typename T2, typename T3>
    struct create3;

template<typename T1, typename T2, typename T3, typename T4>
    struct create4;

template<typename T1, typename T2, typename T3, typename T4, typename T5>
    struct create5;

template<typename T1, typename T2, typename T3,
	   typename T4, typename T5, typename T6>
    struct create6;

namespace detail
{
  template<typename Fn, typename Typelist_Chain>
    struct apply_;

template<typename Fn, typename Hd, typename Tl>
    struct apply_<Fn, chain<Hd, Tl> >
    {
      void
      operator()(Fn& f)
      {
	f.operator()(Hd());
	apply_<Fn, Tl> next;
	next(f);
      }
    };

template<typename Fn>
    struct apply_<Fn, null_type>
    {
      void
      operator()(Fn&) { }
    };

template<typename Gn, typename Typelist_Chain>
    struct apply_generator1_;

template<typename Gn, typename Hd, typename Tl>
    struct apply_generator1_<Gn, chain<Hd, Tl> >
    {
      void
      operator()(Gn& g)
      {
	g.template operator()<Hd>();
	apply_generator1_<Gn, Tl> next;
	next(g);
      }
    };

template<typename Gn>
    struct apply_generator1_<Gn, null_type>
    {
      void
      operator()(Gn&) { }
    };

template<typename Gn, typename TypelistT_Chain, typename TypelistV_Chain>
    struct apply_generator2_;

template<typename Gn, typename Hd1, typename TlT, typename Hd2, typename TlV>
    struct apply_generator2_<Gn, chain<Hd1, TlT>, chain<Hd2, TlV> >
    {
      void
      operator()(Gn& g)
      {
	g.template operator()<Hd1, Hd2>();
	apply_generator2_<Gn, TlT, TlV> next;
	next(g);
      }
    };

template<typename Gn>
    struct apply_generator2_<Gn, null_type, null_type>
    {
      void
      operator()(Gn&) { }
    };

template<typename Typelist_Chain0, typename Typelist_Chain1>
    struct append_;

template<typename Hd, typename Tl, typename Typelist_Chain>
    struct append_<chain<Hd, Tl>, Typelist_Chain>
    {
    private:
      typedef append_<Tl, Typelist_Chain> 			append_type;

public:
      typedef chain<Hd, typename append_type::type> 		type;
    };

template<typename Typelist_Chain>
    struct append_<null_type, Typelist_Chain>
    {
      typedef Typelist_Chain 			      		type;
    };

template<typename Typelist_Chain>
    struct append_<Typelist_Chain, null_type>
    {
      typedef Typelist_Chain 					type;
    };

template<>
    struct append_<null_type, null_type>
    {
      typedef null_type 					type;
    };

template<typename Typelist_Typelist_Chain>
    struct append_typelist_;

template<typename Hd>
    struct append_typelist_<chain<Hd, null_type> >
    {
      typedef chain<Hd, null_type> 				type;
    };

template<typename Hd, typename Tl>
    struct append_typelist_<chain< Hd, Tl> >
    {
    private:
      typedef typename append_typelist_<Tl>::type 		rest_type;

public:
      typedef typename append<Hd, node<rest_type> >::type::root	type;
    };

template<typename Typelist_Chain, typename T>
    struct contains_;

template<typename T>
    struct contains_<null_type, T>
    {
      enum
	{
	  value = false
	};
    };

template<typename Hd, typename Tl, typename T>
    struct contains_<chain<Hd, Tl>, T>
    {
      enum
	{
	  value = contains_<Tl, T>::value
	};
    };

template<typename Tl, typename T>
    struct contains_<chain<T, Tl>, T>
    {
      enum
	{
	  value = true
	};
    };

template<typename Typelist_Chain, template<typename T> class Pred>
    struct chain_filter_;

template<template<typename T> class Pred>
    struct chain_filter_<null_type, Pred>
    {
      typedef null_type 					type;
  };

template<typename Hd, typename Tl, template<typename T> class Pred>
    struct chain_filter_<chain<Hd, Tl>, Pred>
    {
    private:
      enum
	{
	  include_hd = Pred<Hd>::value
	};

typedef typename chain_filter_<Tl, Pred>::type 		rest_type;
      typedef chain<Hd, rest_type> 				chain_type;

public:
      typedef typename __conditional_type<include_hd, chain_type, rest_type>::__type type;
  };

template<typename Typelist_Chain, int i>
    struct chain_at_index_;

template<typename Hd, typename Tl>
    struct chain_at_index_<chain<Hd, Tl>, 0>
    {
      typedef Hd 						type;
    };

template<typename Hd, typename Tl, int i>
    struct chain_at_index_<chain<Hd, Tl>, i>
    {
      typedef typename chain_at_index_<Tl, i - 1>::type 	type;
    };

template<class Typelist_Chain, template<typename T> class Transform>
    struct chain_transform_;

template<template<typename T> class Transform>
    struct chain_transform_<null_type, Transform>
    {
      typedef null_type 					type;
    };

template<class Hd, class Tl, template<typename T> class Transform>
    struct chain_transform_<chain<Hd, Tl>, Transform>
    {
    private:
      typedef typename chain_transform_<Tl, Transform>::type 	rest_type;
      typedef typename Transform<Hd>::type 			transform_type;

public:
      typedef chain<transform_type, rest_type> 			type;
    };

template<typename Typelist_Typelist_Chain>
    struct chain_flatten_;

template<typename Hd_Tl>
    struct chain_flatten_<chain<Hd_Tl, null_type> >
    {
      typedef typename Hd_Tl::root 				type;
    };

template<typename Hd_Typelist, class Tl_Typelist>
    struct chain_flatten_<chain<Hd_Typelist, Tl_Typelist> >
    {
    private:
      typedef typename chain_flatten_<Tl_Typelist>::type 	rest_type;
      typedef append<Hd_Typelist, node<rest_type> >		append_type;
    public:
      typedef typename append_type::type::root 			type;
    };
} // namespace detail

#define _GLIBCXX_TYPELIST_CHAIN1(X0) __gnu_cxx::typelist::chain<X0, __gnu_cxx::typelist::null_type>
#define _GLIBCXX_TYPELIST_CHAIN2(X0, X1) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN1(X1) >
#define _GLIBCXX_TYPELIST_CHAIN3(X0, X1, X2) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN2(X1, X2) >
#define _GLIBCXX_TYPELIST_CHAIN4(X0, X1, X2, X3) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN3(X1, X2, X3) >
#define _GLIBCXX_TYPELIST_CHAIN5(X0, X1, X2, X3, X4) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN4(X1, X2, X3, X4) >
#define _GLIBCXX_TYPELIST_CHAIN6(X0, X1, X2, X3, X4, X5) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN5(X1, X2, X3, X4, X5) >
#define _GLIBCXX_TYPELIST_CHAIN7(X0, X1, X2, X3, X4, X5, X6) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN6(X1, X2, X3, X4, X5, X6) >
#define _GLIBCXX_TYPELIST_CHAIN8(X0, X1, X2, X3, X4, X5, X6, X7) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN7(X1, X2, X3, X4, X5, X6, X7) >
#define _GLIBCXX_TYPELIST_CHAIN9(X0, X1, X2, X3, X4, X5, X6, X7, X8) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN8(X1, X2, X3, X4, X5, X6, X7, X8) >
#define _GLIBCXX_TYPELIST_CHAIN10(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN9(X1, X2, X3, X4, X5, X6, X7, X8, X9) >
#define _GLIBCXX_TYPELIST_CHAIN11(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN10(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10) >
#define _GLIBCXX_TYPELIST_CHAIN12(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN11(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11) >
#define _GLIBCXX_TYPELIST_CHAIN13(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN12(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12) >
#define _GLIBCXX_TYPELIST_CHAIN14(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN13(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13) >
#define _GLIBCXX_TYPELIST_CHAIN15(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN14(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14) >
#define _GLIBCXX_TYPELIST_CHAIN16(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN15(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15) >
#define _GLIBCXX_TYPELIST_CHAIN17(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN16(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16) >
#define _GLIBCXX_TYPELIST_CHAIN18(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16, X17) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN17(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16, X17) >
#define _GLIBCXX_TYPELIST_CHAIN19(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16, X17, X18) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN18(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16, X17, X18) >
#define _GLIBCXX_TYPELIST_CHAIN20(X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16, X17, X18, X19) __gnu_cxx::typelist::chain<X0, _GLIBCXX_TYPELIST_CHAIN19(X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16, X17, X18, X19) >

template<typename Fn, typename Typelist>
    void
    apply(Fn& fn, Typelist)
    {
      detail::apply_<Fn, typename Typelist::root> a;
      a(fn);
    }

template<typename Fn, typename Typelist>
    void
    apply_generator(Fn& fn, Typelist)
    {
      detail::apply_generator1_<Fn, typename Typelist::root> a;
      a(fn);
    }

template<typename Fn, typename TypelistT, typename TypelistV>
    void
    apply_generator(Fn& fn, TypelistT, TypelistV)
    {
      typedef typename TypelistT::root rootT;
      typedef typename TypelistV::root rootV;
      detail::apply_generator2_<Fn, rootT, rootV> a;
      a(fn);
    }

template<typename Typelist0, typename Typelist1>
    struct append
    {
    private:
      typedef typename Typelist0::root 				root0_type;
      typedef typename Typelist1::root 				root1_type;
      typedef detail::append_<root0_type, root1_type> 		append_type;

public:
      typedef node<typename append_type::type> 			type;
    };

template<typename Typelist_Typelist>
    struct append_typelist
    {
    private:
      typedef typename Typelist_Typelist::root 		      	root_type;
      typedef detail::append_typelist_<root_type> 		append_type;

public:
      typedef node<typename append_type::type> 			type;
    };

template<typename Typelist, typename T>
    struct contains
    {
    private:
      typedef typename Typelist::root 				root_type;

public:
      enum
	{
	  value = detail::contains_<root_type, T>::value
	};
    };

template<typename Typelist, template<typename T> class Pred>
    struct filter
    {
    private:
      typedef typename Typelist::root 				root_type;
      typedef detail::chain_filter_<root_type, Pred> 		filter_type;

public:
      typedef node<typename filter_type::type> 	       		type;
    };

template<typename Typelist, int i>
    struct at_index
    {
    private:
      typedef typename Typelist::root 				root_type;
      typedef detail::chain_at_index_<root_type, i> 		index_type;

public:
      typedef typename index_type::type 			type;
    };

template<typename Typelist, template<typename T> class Transform>
    struct transform
    {
    private:
      typedef typename Typelist::root 				root_type;
      typedef detail::chain_transform_<root_type, Transform> 	transform_type;

public:
      typedef node<typename transform_type::type> 		type;
    };

template<typename Typelist_Typelist>
    struct flatten
    {
    private:
      typedef typename Typelist_Typelist::root 		      	root_type;
      typedef typename detail::chain_flatten_<root_type>::type 	flatten_type;

public:
      typedef node<flatten_type> 				type;
    };

template<typename Typelist>
    struct from_first
    {
    private:
      typedef typename at_index<Typelist, 0>::type 		first_type;

public:
      typedef node<chain<first_type, null_type> > 		type;
    };

template<typename T1>
    struct create1
    {
      typedef node<_GLIBCXX_TYPELIST_CHAIN1(T1)> 		type;
    };

template<typename T1, typename T2>
    struct create2
    {
      typedef node<_GLIBCXX_TYPELIST_CHAIN2(T1,T2)> 		type;
    };

template<typename T1, typename T2, typename T3>
    struct create3
    {
      typedef node<_GLIBCXX_TYPELIST_CHAIN3(T1,T2,T3)>		type;
    };

template<typename T1, typename T2, typename T3, typename T4>
    struct create4
    {
      typedef node<_GLIBCXX_TYPELIST_CHAIN4(T1,T2,T3,T4)>	type;
    };

template<typename T1, typename T2, typename T3,
	   typename T4, typename T5>
    struct create5
    {
      typedef node<_GLIBCXX_TYPELIST_CHAIN5(T1,T2,T3,T4,T5)>	type;
    };

template<typename T1, typename T2, typename T3,
	   typename T4, typename T5, typename T6>
    struct create6
    {
      typedef node<_GLIBCXX_TYPELIST_CHAIN6(T1,T2,T3,T4,T5,T6)>	type;
    };
} // namespace typelist
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif

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