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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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44
include/boost/fusion/functional/invocation/invoke.hpp
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@ -41,6 +41,7 @@
#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/at.hpp>
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/sequence/intrinsic/front.hpp>
@ -52,29 +53,10 @@
namespace boost { namespace fusion
{
//~ namespace result_of
//~ {
//~ template <typename Function, class Sequence,
//~ class Enable = unspecified>
//~ struct invoke;
//~ }
//~ template <typename Function, class Sequence>
//~ inline typename result_of::invoke<Function, Sequence>::type
//~ invoke(Function, Sequence &);
//~ template <typename Function, class Sequence>
//~ inline typename result_of::invoke<Function, Sequence const>::type
//~ invoke(Function, Sequence const &);
//----- ---- --- -- - - - -
namespace detail
{
namespace ft = function_types;
template <typename, typename T = void> struct always_void_ { typedef T type; };
template<
typename Function, class Sequence,
int N = result_of::size<Sequence>::value,
@ -161,14 +143,20 @@ namespace boost { namespace fusion
namespace result_of
{
template <typename Function, class Sequence,
class Enable =
typename detail::invoke_impl<
typename boost::remove_reference<Function>::type, Sequence
>::result_type>
struct invoke
template <typename Function, class Sequence, typename = void>
struct invoke;
template <typename Function, class Sequence>
struct invoke<Function, Sequence,
typename detail::enabler<
typename detail::invoke_impl<
typename boost::remove_reference<Function>::type, Sequence
>::result_type
>::type>
{
typedef Enable type;
typedef typename detail::invoke_impl<
typename boost::remove_reference<Function>::type, Sequence
>::result_type type;
};
}
@ -207,7 +195,7 @@ namespace boost { namespace fusion
template <typename Function, class Sequence>
struct invoke_impl<Function,Sequence,N,false,true,
typename always_void_<
typename enabler<
typename boost::result_of<Function(BOOST_PP_ENUM(N,M,~)) >::type
>::type>
{
@ -301,7 +289,7 @@ namespace boost { namespace fusion
template <typename Function, class Sequence>
struct invoke_impl<Function,Sequence,N,false,false,
typename always_void_<
typename enabler<
#define L(z,j,data) typename invoke_param_types<Sequence,N>::BOOST_PP_CAT(T, j)
typename boost::result_of<Function(BOOST_PP_ENUM(N,L,~))>::type
>::type>

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;

48
include/boost/fusion/functional/invocation/invoke_procedure.hpp
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@ -28,6 +28,7 @@
#include <boost/function_types/parameter_types.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/fusion/support/detail/enabler.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
@ -38,24 +39,6 @@
namespace boost { namespace fusion
{
namespace result_of
{
template <typename Function, class Sequence> struct invoke_procedure
{
typedef void type;
};
}
template <typename Function, class Sequence>
BOOST_FUSION_GPU_ENABLED
inline void invoke_procedure(Function, Sequence &);
template <typename Function, class Sequence>
BOOST_FUSION_GPU_ENABLED
inline void invoke_procedure(Function, Sequence const &);
//----- ---- --- -- - - - -
namespace detail
{
namespace ft = function_types;
@ -76,9 +59,27 @@ namespace boost { namespace fusion
}
namespace result_of
{
template <typename Function, class Sequence, class Enable = void>
struct invoke_procedure;
template <typename Function, class Sequence>
struct invoke_procedure<Function, Sequence,
typename detail::enabler<
typename detail::invoke_procedure_impl<
typename boost::remove_reference<Function>::type,Sequence
>::result_type
>::type>
{
typedef void type;
};
}
template <typename Function, class Sequence>
BOOST_FUSION_GPU_ENABLED
inline void invoke_procedure(Function f, Sequence & s)
inline typename result_of::invoke_procedure<Function, Sequence>::type
invoke_procedure(Function f, Sequence & s)
{
detail::invoke_procedure_impl<
typename boost::remove_reference<Function>::type,Sequence
@ -87,7 +88,8 @@ namespace boost { namespace fusion
template <typename Function, class Sequence>
BOOST_FUSION_GPU_ENABLED
inline void invoke_procedure(Function f, Sequence const & s)
inline typename result_of::invoke_procedure<Function, Sequence const>::type
invoke_procedure(Function f, Sequence const & s)
{
detail::invoke_procedure_impl<
typename boost::remove_reference<Function>::type,Sequence const
@ -110,6 +112,7 @@ namespace boost { namespace fusion
template <typename Function, class Sequence>
struct invoke_procedure_impl<Function,Sequence,N,false,true>
{
typedef void result_type;
#if N > 0
@ -135,6 +138,8 @@ namespace boost { namespace fusion
template <typename Function, class Sequence>
struct invoke_procedure_impl<Function,Sequence,N,true,true>
{
typedef void result_type;
BOOST_FUSION_GPU_ENABLED
static inline void call(Function & f, Sequence & s)
{
@ -155,6 +160,7 @@ namespace boost { namespace fusion
template <typename Function, class Sequence>
struct invoke_procedure_impl<Function,Sequence,N,false,false>
{
typedef void result_type;
#if N > 0
@ -182,6 +188,8 @@ namespace boost { namespace fusion
template <typename Function, class Sequence>
struct invoke_procedure_impl<Function,Sequence,N,true,false>
{
typedef void result_type;
BOOST_FUSION_GPU_ENABLED
static inline void call(Function & f, Sequence & s)
{

18
include/boost/fusion/support/detail/enabler.hpp Normal file
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@ -0,0 +1,18 @@
/*=============================================================================
Copyright (c) 2015 Kohei Takahashi
Use modification and distribution are subject to 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).
==============================================================================*/
#ifndef FUSION_DETAIL_ENABLER_02082015_163810
#define FUSION_DETAIL_ENABLER_02082015_163810
namespace boost { namespace fusion { namespace detail
{
template <typename, typename T = void>
struct enabler { typedef T type; };
}}}
#endif