/*============================================================================= | |
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 |