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added case for equal_to that returns false immediately if the tags are different in the first place

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[SVN r73685]
This commit is contained in:
Joel de Guzman
2011-08-12 05:13:03 +00:00
parent 48a0546eea
commit 744dbcbbc7
2 changed files with 29 additions and 10 deletions
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20
include/boost/fusion/iterator/equal_to.hpp
View File

@ -1,7 +1,7 @@
/*=============================================================================
Copyright (c) 2001-2006 Joel de Guzman
Distributed under the Boost Software License, Version 1.0. (See accompanying
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(FUSION_EQUAL_TO_05052005_1208)
@ -37,8 +37,18 @@ namespace boost { namespace fusion
template <>
struct equal_to_impl<iterator_facade_tag>
{
template <typename I1, typename I2>
struct apply : I1::template equal_to<I1, I2> {};
template <typename It1, typename It2, typename Tag1, typename Tag2>
struct dispatch : mpl::false_ {};
template <typename It1, typename It2, typename Tag>
struct dispatch<It1, It2, Tag, Tag> // same tag
: It1::template equal_to<It1, It2>
{};
template<typename It1, typename It2>
struct apply : dispatch<It1, It2,
typename It1::fusion_tag, typename It2::fusion_tag>
{};
};
template <>
@ -63,7 +73,7 @@ namespace boost { namespace fusion
namespace iterator_operators
{
template <typename Iter1, typename Iter2>
inline typename
inline typename
enable_if<
mpl::and_<is_fusion_iterator<Iter1>, is_fusion_iterator<Iter2> >
, bool
@ -74,7 +84,7 @@ namespace boost { namespace fusion
}
template <typename Iter1, typename Iter2>
inline typename
inline typename
enable_if<
mpl::and_<is_fusion_iterator<Iter1>, is_fusion_iterator<Iter2> >
, bool

19
include/boost/fusion/iterator/iterator_adapter.hpp
View File

@ -9,6 +9,7 @@
#include <boost/fusion/iterator/detail/advance.hpp>
#include <boost/fusion/iterator/iterator_facade.hpp>
#include <boost/type_traits/remove_const.hpp>
namespace boost { namespace fusion
{
@ -18,7 +19,9 @@ namespace boost { namespace fusion
Derived_
, typename Iterator_::category>
{
typedef Iterator_ iterator_base_type;
typedef typename
remove_const<Iterator_>::type
iterator_base_type;
iterator_base_type iterator_base;
iterator_adapter(iterator_base_type const& iterator_base)
@ -36,12 +39,18 @@ namespace boost { namespace fusion
// default implementation
template <typename Iterator, typename N>
struct advance
: Derived_::template make<
{
typedef typename Derived_::template make<
typename result_of::advance<
typename Iterator::iterator_base_type, N
>::type
>
{
>::type>::type
type;
static type
call(Iterator const& it)
{
return type(fusion::advance<N>(it.iterator_base));
}
};
// default implementation