feedc0de/boost_fusion
1
0
Fork 0
forked from boostorg/fusion
Code Pull Requests Activity

fix find_s and find_if_s to return the end iterator when item not found

Browse Source 
[SVN r73669]
This commit is contained in:
Eric Niebler
2011-08-11 17:49:02 +00:00
parent b83a2954f5
commit 5d07df005b
4 changed files with 87 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
include/boost/fusion/algorithm/query/ext_/find_if_s.hpp
View File

@ -9,6 +9,7 @@
#include <boost/type_traits/remove_const.hpp>
#include <boost/fusion/algorithm/query/find_if.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
#include <boost/fusion/view/ext_/segmented_fold_until.hpp>
namespace boost { namespace fusion { namespace detail
@ -39,7 +40,7 @@ namespace boost { namespace fusion { namespace detail
iterator_type,
typename result_of::end<Range>::type
>,
fusion::result<segmented_iterator_type, continue_>, // NOT FOUND
fusion::result<typename remove_const<State>::type, continue_>, // NOT FOUND
fusion::result<segmented_iterator_type, break_> // FOUND
>::type
type;
@ -47,7 +48,29 @@ namespace boost { namespace fusion { namespace detail
template<typename Range, typename State, typename Context>
typename result<segmented_find_if_fun(Range&, State const&, Context const&)>::type
operator()(Range& rng, State const&, Context const& context) const
operator()(Range& rng, State const& state, Context const& context) const
{
typedef
typename result_of::equal_to<
typename result_of::find_if<Range, Pred>::type,
typename result_of::end<Range>::type
>::type
not_found;
return call(rng, state, context, not_found());
}
private:
template<typename Range, typename State, typename Context>
typename result<segmented_find_if_fun(Range&, State const&, Context const&)>::type
call(Range&, State const& state, Context const&, mpl::true_) const
{
return state;
}
template<typename Range, typename State, typename Context>
typename result<segmented_find_if_fun(Range&, State const&, Context const&)>::type
call(Range& rng, State const&, Context const& context, mpl::false_) const
{
return fusion::make_segmented_iterator(fusion::find_if<Pred>(rng), context);
}
@ -61,7 +84,10 @@ namespace boost { namespace fusion
{
template <typename Sequence, typename Pred>
struct find_if_s
: result_of::segmented_fold_until<Sequence, void_, detail::segmented_find_if_fun<Pred> >
: result_of::segmented_fold_until<
Sequence,
typename result_of::end<Sequence>::type,
detail::segmented_find_if_fun<Pred> >
{};
}
@ -69,14 +95,19 @@ namespace boost { namespace fusion
typename result_of::find_if_s<Sequence, Pred>::type
find_if_s(Sequence& seq)
{
return fusion::segmented_fold_until(seq, void_(), detail::segmented_find_if_fun<Pred>());
return fusion::segmented_fold_until(
seq,
fusion::end(seq),
detail::segmented_find_if_fun<Pred>());
}
template <typename Pred, typename Sequence>
typename result_of::find_if_s<Sequence const, Pred>::type
find_if_s(Sequence const& seq)
{
return fusion::segmented_fold_until(seq, void_(), detail::segmented_find_if_fun<Pred>());
return fusion::segmented_fold_until(
seq, fusion::end(seq),
detail::segmented_find_if_fun<Pred>());
}
}}

42
include/boost/fusion/algorithm/query/ext_/find_s.hpp
View File

@ -9,6 +9,7 @@
#include <boost/type_traits/remove_const.hpp>
#include <boost/fusion/algorithm/query/find.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
#include <boost/fusion/view/ext_/segmented_fold_until.hpp>
namespace boost { namespace fusion { namespace detail
@ -39,7 +40,7 @@ namespace boost { namespace fusion { namespace detail
iterator_type,
typename result_of::end<Range>::type
>,
fusion::result<segmented_iterator_type, continue_>, // NOT FOUND
fusion::result<typename remove_const<State>::type, continue_>, // NOT FOUND
fusion::result<segmented_iterator_type, break_> // FOUND
>::type
type;
@ -47,7 +48,29 @@ namespace boost { namespace fusion { namespace detail
template<typename Range, typename State, typename Context>
typename result<segmented_find_fun(Range&, State const&, Context const&)>::type
operator()(Range& rng, State const&, Context const& context) const
operator()(Range& rng, State const&state, Context const& context) const
{
typedef
typename result_of::equal_to<
typename result_of::find<Range, T>::type,
typename result_of::end<Range>::type
>::type
not_found;
return call(rng, state, context, not_found());
}
private:
template<typename Range, typename State, typename Context>
typename result<segmented_find_fun(Range&, State const&, Context const&)>::type
call(Range&, State const&state, Context const&, mpl::true_) const
{
return state;
}
template<typename Range, typename State, typename Context>
typename result<segmented_find_fun(Range&, State const&, Context const&)>::type
call(Range& rng, State const&, Context const& context, mpl::false_) const
{
return fusion::make_segmented_iterator(fusion::find<T>(rng), context);
}
@ -61,7 +84,10 @@ namespace boost { namespace fusion
{
template <typename Sequence, typename T>
struct find_s
: result_of::segmented_fold_until<Sequence, void_, detail::segmented_find_fun<T> >
: result_of::segmented_fold_until<
Sequence,
typename result_of::end<Sequence>::type,
detail::segmented_find_fun<T> >
{};
}
@ -69,14 +95,20 @@ namespace boost { namespace fusion
typename result_of::find_s<Sequence, T>::type
find_s(Sequence& seq)
{
return fusion::segmented_fold_until(seq, void_(), detail::segmented_find_fun<T>());
return fusion::segmented_fold_until(
seq,
fusion::end(seq),
detail::segmented_find_fun<T>());
}
template <typename T, typename Sequence>
typename result_of::find_s<Sequence const, T>::type
find_s(Sequence const& seq)
{
return fusion::segmented_fold_until(seq, void_(), detail::segmented_find_fun<T>());
return fusion::segmented_fold_until(
seq,
fusion::end(seq),
detail::segmented_find_fun<T>());
}
}}