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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
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)
=============================================================================*/
#if !defined(SPIRIT_PERMUTE_FUNCTION_MARCH_13_2007_1129AM)
#define SPIRIT_PERMUTE_FUNCTION_MARCH_13_2007_1129AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/support/unused.hpp>
#include <boost/optional.hpp>
namespace boost { namespace spirit { namespace qi { namespace detail
{
template <typename Iterator, typename Context, typename Skipper>
struct permute_function
{
permute_function(
Iterator& first, Iterator const& last
, Context& context, Skipper const& skipper)
: first(first)
, last(last)
, context(context)
, skipper(skipper)
{
}
template <typename Component, typename Attribute>
bool operator()(Component const& component, Attribute& attr)
{
// return true if the parser succeeds and the slot is not yet taken
if (!*taken && component.parse(first, last, context, skipper, attr))
{
*taken = true;
++taken;
return true;
}
++taken;
return false;
}
template <typename Component, typename Attribute>
bool operator()(Component const& component, boost::optional<Attribute>& attr)
{
// return true if the parser succeeds and the slot is not yet taken
Attribute val;
if (!*taken && component.parse(first, last, context, skipper, val))
{
attr = val;
*taken = true;
++taken;
return true;
}
++taken;
return false;
}
template <typename Component>
bool operator()(Component const& component)
{
// return true if the parser succeeds and the slot is not yet taken
if (!*taken && component.parse(first, last, context, skipper, unused))
{
*taken = true;
++taken;
return true;
}
++taken;
return false;
}
Iterator& first;
Iterator const& last;
Context& context;
Skipper const& skipper;
bool* taken;
private:
// silence MSVC warning C4512: assignment operator could not be generated
permute_function& operator= (permute_function const&);
};
}}}}
#endif
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