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Fix #10443: SFINAE-friendly result_of::invoke.

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It means previous pull-requests (#24) is still incomplete.
This commit is contained in:
Kohei Takahashi
2015-02-12 21:21:01 +09:00
parent c5c0147d7d
commit bd4b1cdac6
7 changed files with 171 additions and 107 deletions
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51
include/boost/fusion/functional/invocation/invoke_function_object.hpp
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@ -25,6 +25,7 @@
#include <boost/utility/result_of.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/fusion/support/detail/enabler.hpp>
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
@ -34,29 +35,13 @@
namespace boost { namespace fusion
{
namespace result_of
{
template <class Function, class Sequence> struct invoke_function_object;
}
template <class Function, class Sequence>
BOOST_FUSION_GPU_ENABLED
inline typename result_of::invoke_function_object<Function, Sequence>::type
invoke_function_object(Function, Sequence &);
template <class Function, class Sequence>
BOOST_FUSION_GPU_ENABLED
inline typename result_of::invoke_function_object<Function, Sequence const
>::type invoke_function_object(Function, Sequence const &);
//----- ---- --- -- - - - -
namespace detail
{
template<
class Function, class Sequence,
int N = result_of::size<Sequence>::value,
bool RandomAccess = traits::is_random_access<Sequence>::value
bool RandomAccess = traits::is_random_access<Sequence>::value,
typename Enable = void
>
struct invoke_function_object_impl;
@ -72,7 +57,16 @@ namespace boost { namespace fusion
namespace result_of
{
template <class Function, class Sequence> struct invoke_function_object
template <class Function, class Sequence, class Enable = void>
struct invoke_function_object;
template <class Function, class Sequence>
struct invoke_function_object<Function, Sequence,
typename detail::enabler<
typename detail::invoke_function_object_impl<
typename boost::remove_reference<Function>::type, Sequence
>::result_type
>::type>
{
typedef typename detail::invoke_function_object_impl<
typename boost::remove_reference<Function>::type, Sequence
@ -111,14 +105,18 @@ namespace boost { namespace fusion
///////////////////////////////////////////////////////////////////////////////
#define N BOOST_PP_ITERATION()
#define M(z,j,data) \
typename result_of::at_c<Sequence,j>::type
template <class Function, class Sequence>
struct invoke_function_object_impl<Function,Sequence,N,true>
struct invoke_function_object_impl<Function,Sequence,N,true,
typename enabler<
typename boost::result_of<Function (BOOST_PP_ENUM(N,M,~)) >::type
>::type>
{
public:
typedef typename boost::result_of<
#define M(z,j,data) \
typename result_of::at_c<Sequence,j>::type
Function (BOOST_PP_ENUM(N,M,~)) >::type result_type;
#undef M
@ -148,8 +146,15 @@ namespace boost { namespace fusion
};
#define M(z,j,data) \
typename invoke_function_object_param_types<Sequence,N>::T ## j
template <class Function, class Sequence>
struct invoke_function_object_impl<Function,Sequence,N,false>
struct invoke_function_object_impl<Function,Sequence,N,false,
typename enabler<
typename boost::result_of<Function (BOOST_PP_ENUM(N,M,~)) >::type
>::type>
#undef M
{
private:
typedef invoke_function_object_param_types<Sequence,N> seq;