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fusion fold and transform passing refs for lvalues as per result_of protocol

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[SVN r38039]
This commit is contained in:
Dan Marsden
2007-06-19 21:30:06 +00:00
parent 0e5cb04b99
commit 09a6da1f80
13 changed files with 157 additions and 40 deletions
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10
include/boost/fusion/algorithm/iteration/detail/fold.hpp
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@ -13,6 +13,9 @@
#include <boost/fusion/iterator/distance.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/add_reference.hpp>
namespace boost { namespace fusion {
namespace result_of
{
@ -32,8 +35,11 @@ namespace detail
template <typename Iterator, typename State, typename F>
struct fold_apply
: boost::result_of<F(typename result_of::value_of<Iterator>::type, State)>
{};
{
typedef typename result_of::deref<Iterator>::type dereferenced;
typedef typename add_reference<typename add_const<State>::type>::type lvalue_state;
typedef typename boost::result_of<F(dereferenced, lvalue_state)>::type type;
};
template <typename First, typename Last, typename State, typename F>
struct static_fold;

6
include/boost/fusion/algorithm/transformation/detail/replace.hpp
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@ -9,6 +9,7 @@
#include <boost/type_traits/is_convertible.hpp>
#include <boost/mpl/if.hpp>
#include <boost/type_traits/remove_reference.hpp>
namespace boost { namespace fusion { namespace detail
{
@ -43,14 +44,15 @@ namespace boost { namespace fusion { namespace detail
replacer(T const& old_value, T const& new_value)
: old_value(old_value), new_value(new_value) {}
template<typename Params>
template<typename Sig>
struct result;
template <typename U1, typename U2>
struct result<replacer<U1>(U2)>
{
typedef typename remove_reference<U2>::type value;
typedef typename
mpl::if_<is_convertible<T, U2>, U2, U2 const&>::type
mpl::if_<is_convertible<T, value>, value, value const&>::type
type;
};

4
include/boost/fusion/algorithm/transformation/detail/replace_if.hpp
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@ -9,6 +9,7 @@
#include <boost/utility/enable_if.hpp>
#include <boost/mpl/if.hpp>
#include <boost/type_traits/remove_reference.hpp>
namespace boost { namespace fusion { namespace detail
{
@ -49,8 +50,9 @@ namespace boost { namespace fusion { namespace detail
template <typename F1, typename T1, typename U>
struct result<replacer_if<F1, T1>(U)>
{
typedef typename remove_reference<U>::type value;
typedef typename
mpl::if_<is_convertible<T, U>, U, U const&>::type
mpl::if_<is_convertible<T, value>, value, value const&>::type
type;
};