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/usr/include/boost/spirit/home/support

Name	Size	Mode	Actions
algorithm/	-	0755	rm
auto/	-	0755	rm
auxiliary/	-	0755	rm
char_encoding/	-	0755	rm
char_set/	-	0755	rm
detail/	-	0755	rm
iterators/	-	0755	rm
nonterminal/	-	0755	rm
utree/	-	0755	rm
action_dispatch.hpp	7518	0644	edit dl rm
adapt_adt_attributes.hpp	13835	0644	edit dl rm
argument.hpp	6649	0644	edit dl rm
argument_expression.hpp	2909	0644	edit dl rm
assert_msg.hpp	2273	0644	edit dl rm
attributes.hpp	45802	0644	edit dl rm
attributes_fwd.hpp	11871	0644	edit dl rm
auto.hpp	1298	0644	edit dl rm
char_class.hpp	32911	0644	edit dl rm
common_terminals.hpp	18649	0644	edit dl rm
container.hpp	15358	0644	edit dl rm
context.hpp	9365	0644	edit dl rm
extended_variant.hpp	5351	0644	edit dl rm
handles_container.hpp	2084	0644	edit dl rm
has_semantic_action.hpp	1517	0644	edit dl rm
info.hpp	4836	0644	edit dl rm
lazy.hpp	1225	0644	edit dl rm
limits.hpp	607	0644	edit dl rm
make_component.hpp	15593	0644	edit dl rm
meta_compiler.hpp	12503	0644	edit dl rm
modify.hpp	3765	0644	edit dl rm
multi_pass.hpp	1708	0644	edit dl rm
multi_pass_wrapper.hpp	1419	0644	edit dl rm
numeric_traits.hpp	3559	0644	edit dl rm
sequence_base_id.hpp	1362	0644	edit dl rm
string_traits.hpp	10474	0644	edit dl rm
terminal.hpp	23296	0644	edit dl rm
terminal_expression.hpp	583	0644	edit dl rm
unused.hpp	2347	0644	edit dl rm
utf8.hpp	3613	0644	edit dl rm
utree.hpp	812	0644	edit dl rm

Edit: /usr/include/boost/spirit/home/support/modify.hpp (3765B)

/*=============================================================================
  Copyright (c) 2001-2011 Joel de Guzman
  http://spirit.sourceforge.net/

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_SPIRIT_MODIFY_OCTOBER_25_2008_0142PM
#define BOOST_SPIRIT_MODIFY_OCTOBER_25_2008_0142PM

#if defined(_MSC_VER)
#pragma once
#endif

#include <boost/type_traits/is_base_of.hpp>
#include <boost/spirit/home/support/unused.hpp>

namespace boost { namespace spirit
{
    template <typename Domain, typename T, typename Enable = void>
    struct is_modifier_directive;

// Testing if a modifier set includes a modifier T involves
    // checking for inheritance (i.e. Modifiers is derived from T)
    template <typename Modifiers, typename T>
    struct has_modifier
        : is_base_of<T, Modifiers> {};

// Adding modifiers is done using multi-inheritance
    template <typename Current, typename New, typename Enable = void>
    struct compound_modifier : Current, New
    {
        compound_modifier()
          : Current(), New() {}

compound_modifier(Current const& current, New const& new_)
          : Current(current), New(new_) {}
    };

// Don't add if New is already in Current
    template <typename Current, typename New>
    struct compound_modifier<
        Current, New, typename enable_if<has_modifier<Current, New> >::type>
      : Current
    {
        compound_modifier()
          : Current() {}

compound_modifier(Current const& current, New const&)
          : Current(current) {}
    };

// Special case if Current is unused_type
    template <typename New, typename Enable>
    struct compound_modifier<unused_type, New, Enable> : New
    {
        compound_modifier()
          : New() {}

compound_modifier(unused_type, New const& new_)
          : New(new_) {}
    };

// Domains may specialize this modify metafunction to allow
    // directives to add information to the Modifier template
    // parameter that is passed to the make_component metafunction.
    // By default, we return the modifiers untouched
    template <typename Domain, typename Enable = void>
    struct modify
    {
        typedef void proto_is_callable_;

template <typename Sig>
        struct result;

template <typename This, typename Tag, typename Modifiers>
        struct result<This(Tag, Modifiers)>
        {
            typedef typename remove_const<
                typename remove_reference<Tag>::type>::type
            tag_type;
            typedef typename remove_const<
                typename remove_reference<Modifiers>::type>::type
            modifiers_type;

typedef typename mpl::if_<
                is_modifier_directive<Domain, tag_type>
              , compound_modifier<modifiers_type, tag_type>
              , Modifiers>::type
            type;
        };

template <typename Tag, typename Modifiers>
        typename result<modify(Tag, Modifiers)>::type
        operator()(Tag tag, Modifiers modifiers) const
        {
            return op(tag, modifiers, is_modifier_directive<Domain, Tag>());
        }

template <typename Tag, typename Modifiers>
        Modifiers
        op(Tag /*tag*/, Modifiers modifiers, mpl::false_) const
        {
            return modifiers;
        }

template <typename Tag, typename Modifiers>
        compound_modifier<Modifiers, Tag>
        op(Tag tag, Modifiers modifiers, mpl::true_) const
        {
            return compound_modifier<Modifiers, Tag>(modifiers, tag);
        }
    };
}}

#endif

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