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splitter.cpp
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splitter.cpp
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#include <boost/fusion/support/is_sequence.hpp>
#include <boost/proto/proto.hpp>
#include <boost/fusion/algorithm/iteration/for_each.hpp>
#include <boost/fusion/algorithm/transformation.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/proto/transform/transform_expr.hpp>
#include <boost/proto/fusion.hpp>
#include <boost/proto/fusion/push_back.hpp>
#include <boost/proto/visitor.hpp>
#include <boost/preprocessor/control/if.hpp>
#include <boost/preprocessor/facilities/empty.hpp>
#include <boost/preprocessor/facilities/identity.hpp>
#include <iostream>
#include <typeinfo>
namespace proto = boost::proto;
namespace fusion = boost::fusion;
namespace mpl = boost::mpl;
namespace tag {
struct split {};
}
typedef proto::terminal<char>::type terminal;
template <typename Expr>
struct make_split : proto::result_of::make_expr<tag::split, proto::default_domain, Expr> {};
template <typename Expr>
typename make_split<Expr>::type const
split(Expr const& expr)
{
typename make_split<Expr>::type const e = {expr};
return e;
}
template <int N>
struct make_split_terminal : proto::terminal<mpl::int_<N> > {};
template <typename Tag> struct splitter_grammar;
template <typename Tag> struct splitter_visitor;
typedef proto::visitor<splitter_visitor, splitter_grammar> split_grammar;
split_grammar const splitter = split_grammar();
template <typename Tag>
struct splitter_grammar
: proto::_
{};
template <typename Tag>
struct splitter_visitor
: proto::if_<
proto::fold<
proto::_
, mpl::false_()
, proto::or_<
proto::when<
proto::unary_expr<tag::split, proto::_>
, mpl::or_<mpl::true_, proto::_state>()
>
, proto::otherwise<mpl::or_<mpl::false_, proto::_state>()>
>
>
, proto::functional::join(
proto::functional::push_front(
proto::_state
, proto::transform_expr<
proto::or_<
proto::when<
proto::unary_expr<tag::split, proto::_>
, make_split_terminal<0>(mpl::int_<0>())
>
, proto::otherwise<proto::_>
>
>
)
, proto::fold<
proto::_
, proto::_state
, proto::or_<
proto::when<
proto::unary_expr<tag::split, proto::_>
, proto::if_<
fusion::traits::is_sequence<split_grammar>()
, proto::functional::join(proto::_state, split_grammar)
, proto::functional::push_back(proto::_state, split_grammar)
>
>
, proto::otherwise<proto::_state>
>
>
)
, fusion::vector1<proto::_>(proto::_)
>
{};
template<>
struct splitter_visitor<proto::tag::terminal>
: proto::_expr
{};
template<>
struct splitter_visitor<tag::split>
: proto::when<proto::_, split_grammar(proto::_child0)>
{};
int main()
{
terminal const a = {'a'};
terminal const b = {'b'};
terminal const c = {'c'};
terminal const d = {'d'};
terminal const e = {'e'};
terminal const f = {'f'};
fusion::vector0<> res;
/*
std::cout << typeid(splitter(split(a) + split(b), res)).name() << "\n\n";
std::cout << typeid(splitter(a + b, res)).name() << "\n\n";
std::cout << typeid(splitter(split(a) + b, res)).name() << "\n\n";
std::cout << typeid(splitter(a + split(b), res)).name() << "\n\n";
std::cout << typeid(splitter(a + split(b + c), res)).name() << "\n\n";
std::cout << typeid(splitter(a+b+split( c*d + split(e-f)), res)).name() << "\n\n";*/
//splitter(split(a) + split(b), res);
splitter(a + b, res);
splitter(split(a) + b, res);
splitter(a + split(b), res);
splitter(a + split(b + c), res);
}