typelist.h
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// -*- C++ -*-
// Copyright (C) 2005-2024 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/>.
// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
// 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 Hd, typename Tl>
struct append_<chain<Hd, Tl>, null_type>
{
typedef chain<Hd, Tl> 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
type_traits.h
__gnu_cxx
GNU extensions for public use.
__gnu_cxx::typelist
GNU typelist extensions for public compile-time use.
__gnu_cxx::typelist::apply_generator
void apply_generator(Gn &, Typelist)
Apply all typelist types to generator functor.