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// Copyright (C) 2004 Arkadiy Vertleyb
// Copyright (C) 2005 Peder Holt
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_TYPEOF_TEMPLATE_ENCODING_HPP_INCLUDED
#define BOOST_TYPEOF_TEMPLATE_ENCODING_HPP_INCLUDED
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/repetition/enum_trailing.hpp>
#include <boost/preprocessor/control/iif.hpp>
#include <boost/preprocessor/detail/is_unary.hpp>
#include <boost/preprocessor/repetition/repeat.hpp>
#include <boost/preprocessor/tuple/eat.hpp>
#include <boost/preprocessor/seq/transform.hpp>
#include <boost/preprocessor/seq/for_each_i.hpp>
#include <boost/preprocessor/seq/cat.hpp>
#include <boost/typeof/encode_decode.hpp>
#include <boost/typeof/int_encoding.hpp>
#include <boost/typeof/type_template_param.hpp>
#include <boost/typeof/integral_template_param.hpp>
#include <boost/typeof/template_template_param.hpp>
#ifdef __BORLANDC__
#define BOOST_TYPEOF_QUALIFY(P) self_t::P
#else
#define BOOST_TYPEOF_QUALIFY(P) P
#endif
// The template parameter description, entered by the user,
// is converted into a polymorphic "object"
// that is used to generate the code responsible for
// encoding/decoding the parameter, etc.
// make sure to cat the sequence first, and only then add the prefix.
#define BOOST_TYPEOF_MAKE_OBJ(elem) BOOST_PP_CAT(\
BOOST_TYPEOF_MAKE_OBJ,\
BOOST_PP_SEQ_CAT((_) BOOST_TYPEOF_TO_SEQ(elem))\
)
#define BOOST_TYPEOF_TO_SEQ(tokens) BOOST_TYPEOF_ ## tokens ## _BOOST_TYPEOF
// BOOST_TYPEOF_REGISTER_TEMPLATE
#define BOOST_TYPEOF_REGISTER_TEMPLATE_EXPLICIT_ID(Name, Params, Id)\
BOOST_TYPEOF_REGISTER_TEMPLATE_IMPL(\
Name,\
BOOST_TYPEOF_MAKE_OBJS(BOOST_TYPEOF_TOSEQ(Params)),\
BOOST_PP_SEQ_SIZE(BOOST_TYPEOF_TOSEQ(Params)),\
Id)
#define BOOST_TYPEOF_REGISTER_TEMPLATE(Name, Params)\
BOOST_TYPEOF_REGISTER_TEMPLATE_EXPLICIT_ID(Name, Params, BOOST_TYPEOF_UNIQUE_ID())
#define BOOST_TYPEOF_OBJECT_MAKER(s, data, elem)\
BOOST_TYPEOF_MAKE_OBJ(elem)
#define BOOST_TYPEOF_MAKE_OBJS(Params)\
BOOST_PP_SEQ_TRANSFORM(BOOST_TYPEOF_OBJECT_MAKER, ~, Params)
// As suggested by Paul Mensonides:
#define BOOST_TYPEOF_TOSEQ(x)\
BOOST_PP_IIF(\
BOOST_PP_IS_UNARY(x),\
x BOOST_PP_TUPLE_EAT(3), BOOST_PP_REPEAT\
)(x, BOOST_TYPEOF_TOSEQ_2, ~)
#define BOOST_TYPEOF_TOSEQ_2(z, n, _) (class)
// BOOST_TYPEOF_VIRTUAL
#define BOOST_TYPEOF_CAT_4(a, b, c, d) BOOST_TYPEOF_CAT_4_I(a, b, c, d)
#define BOOST_TYPEOF_CAT_4_I(a, b, c, d) a ## b ## c ## d
#define BOOST_TYPEOF_VIRTUAL(Fun, Obj)\
BOOST_TYPEOF_CAT_4(BOOST_TYPEOF_, BOOST_PP_SEQ_HEAD(Obj), _, Fun)
// BOOST_TYPEOF_SEQ_ENUM[_TRAILING][_1]
// Two versions provided due to reentrancy issue
#define BOOST_TYPEOF_SEQ_EXPAND_ELEMENT(z,n,seq)\
BOOST_PP_SEQ_ELEM(0,seq) (z,n,BOOST_PP_SEQ_ELEM(n,BOOST_PP_SEQ_ELEM(1,seq)))
#define BOOST_TYPEOF_SEQ_ENUM(seq,macro)\
BOOST_PP_ENUM(BOOST_PP_SEQ_SIZE(seq),BOOST_TYPEOF_SEQ_EXPAND_ELEMENT,(macro)(seq))
#define BOOST_TYPEOF_SEQ_ENUM_TRAILING(seq,macro)\
BOOST_PP_ENUM_TRAILING(BOOST_PP_SEQ_SIZE(seq),BOOST_TYPEOF_SEQ_EXPAND_ELEMENT,(macro)(seq))
#define BOOST_TYPEOF_SEQ_EXPAND_ELEMENT_1(z,n,seq)\
BOOST_PP_SEQ_ELEM(0,seq) (z,n,BOOST_PP_SEQ_ELEM(n,BOOST_PP_SEQ_ELEM(1,seq)))
#define BOOST_TYPEOF_SEQ_ENUM_1(seq,macro)\
BOOST_PP_ENUM(BOOST_PP_SEQ_SIZE(seq),BOOST_TYPEOF_SEQ_EXPAND_ELEMENT_1,(macro)(seq))
#define BOOST_TYPEOF_SEQ_ENUM_TRAILING_1(seq,macro)\
BOOST_PP_ENUM_TRAILING(BOOST_PP_SEQ_SIZE(seq),BOOST_TYPEOF_SEQ_EXPAND_ELEMENT_1,(macro)(seq))
//
#define BOOST_TYPEOF_PLACEHOLDER(z, n, elem)\
BOOST_TYPEOF_VIRTUAL(PLACEHOLDER, elem)(elem)
#define BOOST_TYPEOF_PLACEHOLDER_TYPES(z, n, elem)\
BOOST_TYPEOF_VIRTUAL(PLACEHOLDER_TYPES, elem)(elem, n)
#define BOOST_TYPEOF_REGISTER_TEMPLATE_ENCODE_PARAM(r, data, n, elem)\
BOOST_TYPEOF_VIRTUAL(ENCODE, elem)(elem, n)
#define BOOST_TYPEOF_REGISTER_TEMPLATE_DECODE_PARAM(r, data, n, elem)\
BOOST_TYPEOF_VIRTUAL(DECODE, elem)(elem, n)
#define BOOST_TYPEOF_REGISTER_TEMPLATE_PARAM_PAIR(z, n, elem) \
BOOST_TYPEOF_VIRTUAL(EXPANDTYPE, elem)(elem) BOOST_PP_CAT(P, n)
#define BOOST_TYPEOF_REGISTER_DEFAULT_TEMPLATE_TYPE(Name,Params,ID)\
Name< BOOST_PP_ENUM_PARAMS(BOOST_PP_SEQ_SIZE(Params), P) >
//Since we are creating an internal decode struct, we need to use different template names, T instead of P.
#define BOOST_TYPEOF_REGISTER_DECODER_TYPE_PARAM_PAIR(z,n,elem) \
BOOST_TYPEOF_VIRTUAL(EXPANDTYPE, elem)(elem) BOOST_PP_CAT(T, n)
//Default template param decoding
#define BOOST_TYPEOF_TYPEDEF_DECODED_TEMPLATE_TYPE(Name,Params)\
typedef Name<BOOST_PP_ENUM_PARAMS(BOOST_PP_SEQ_SIZE(Params),BOOST_TYPEOF_QUALIFY(P))> type;
//Branch the decoding
#define BOOST_TYPEOF_TYPEDEF_DECODED_TYPE(Name,Params)\
BOOST_PP_IF(BOOST_TYPEOF_HAS_TEMPLATES(Params),\
BOOST_TYPEOF_TYPEDEF_DECODED_TEMPLATE_TEMPLATE_TYPE,\
BOOST_TYPEOF_TYPEDEF_DECODED_TEMPLATE_TYPE)(Name,Params)
#define BOOST_TYPEOF_REGISTER_TEMPLATE_IMPL(Name, Params, Size, ID)\
BOOST_TYPEOF_BEGIN_ENCODE_NS\
BOOST_TYPEOF_REGISTER_TEMPLATE_TEMPLATE_IMPL(Name, Params, ID)\
template<class V\
BOOST_TYPEOF_SEQ_ENUM_TRAILING(Params, BOOST_TYPEOF_REGISTER_TEMPLATE_PARAM_PAIR)\
>\
struct encode_type_impl<V, Name<BOOST_PP_ENUM_PARAMS(Size, P)> >\
{\
typedef typename boost::type_of::push_back<V, boost::mpl::size_t<ID> >::type V0;\
BOOST_PP_SEQ_FOR_EACH_I(BOOST_TYPEOF_REGISTER_TEMPLATE_ENCODE_PARAM, ~, Params)\
typedef BOOST_PP_CAT(V, Size) type;\
};\
template<class Iter>\
struct decode_type_impl<boost::mpl::size_t<ID>, Iter>\
{\
typedef decode_type_impl<boost::mpl::size_t<ID>, Iter> self_t;\
typedef boost::mpl::size_t<ID> self_id;\
typedef Iter iter0;\
BOOST_PP_SEQ_FOR_EACH_I(BOOST_TYPEOF_REGISTER_TEMPLATE_DECODE_PARAM, ~, Params)\
BOOST_TYPEOF_TYPEDEF_DECODED_TYPE(Name, Params)\
typedef BOOST_PP_CAT(iter, Size) iter;\
};\
BOOST_TYPEOF_END_ENCODE_NS
#endif//BOOST_TYPEOF_TEMPLATE_ENCODING_HPP_INCLUDED
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