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/*
* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*! \file generic/type_traits.h
* \brief Introspection for free functions defined in generic.
*/
#pragma once
#include <thrust/detail/config.h>
THRUST_NAMESPACE_BEGIN
// forward declaration of any_system_tag for any_conversion below
struct any_system_tag;
namespace system
{
namespace detail
{
// we must define these traits outside of generic's namespace
namespace generic_type_traits_ns
{
typedef char yes;
typedef char (&no)[2];
struct any_conversion
{
template<typename T> any_conversion(const T &);
// add this extra constructor to disambiguate conversion from any_system_tag
any_conversion(const any_system_tag &);
};
namespace select_system_exists_ns
{
no select_system(const any_conversion &);
no select_system(const any_conversion &, const any_conversion &);
no select_system(const any_conversion &, const any_conversion &, const any_conversion &);
no select_system(const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &);
no select_system(const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &);
no select_system(const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &);
template<typename T> yes check(const T &);
no check(no);
template<typename Tag>
struct select_system1_exists
{
static Tag &tag;
static const bool value = sizeof(check(select_system(tag))) == sizeof(yes);
};
template<typename Tag1, typename Tag2>
struct select_system2_exists
{
static Tag1 &tag1;
static Tag2 &tag2;
static const bool value = sizeof(check(select_system(tag1,tag2))) == sizeof(yes);
};
template<typename Tag1, typename Tag2, typename Tag3>
struct select_system3_exists
{
static Tag1 &tag1;
static Tag2 &tag2;
static Tag3 &tag3;
static const bool value = sizeof(check(select_system(tag1,tag2,tag3))) == sizeof(yes);
};
template<typename Tag1, typename Tag2, typename Tag3, typename Tag4>
struct select_system4_exists
{
static Tag1 &tag1;
static Tag2 &tag2;
static Tag3 &tag3;
static Tag4 &tag4;
static const bool value = sizeof(check(select_system(tag1,tag2,tag3,tag4))) == sizeof(yes);
};
template<typename Tag1, typename Tag2, typename Tag3, typename Tag4, typename Tag5>
struct select_system5_exists
{
static Tag1 &tag1;
static Tag2 &tag2;
static Tag3 &tag3;
static Tag4 &tag4;
static Tag5 &tag5;
static const bool value = sizeof(check(select_system(tag1,tag2,tag3,tag4,tag5))) == sizeof(yes);
};
template<typename Tag1, typename Tag2, typename Tag3, typename Tag4, typename Tag5, typename Tag6>
struct select_system6_exists
{
static Tag1 &tag1;
static Tag2 &tag2;
static Tag3 &tag3;
static Tag4 &tag4;
static Tag5 &tag5;
static Tag6 &tag6;
static const bool value = sizeof(check(select_system(tag1,tag2,tag3,tag4,tag5,tag6))) == sizeof(yes);
};
} // end select_system_exists_ns
} // end generic_type_traits_ns
namespace generic
{
template<typename Tag>
struct select_system1_exists
: generic_type_traits_ns::select_system_exists_ns::select_system1_exists<Tag>
{};
template<typename Tag1, typename Tag2>
struct select_system2_exists
: generic_type_traits_ns::select_system_exists_ns::select_system2_exists<Tag1,Tag2>
{};
template<typename Tag1, typename Tag2, typename Tag3>
struct select_system3_exists
: generic_type_traits_ns::select_system_exists_ns::select_system3_exists<Tag1,Tag2,Tag3>
{};
template<typename Tag1, typename Tag2, typename Tag3, typename Tag4>
struct select_system4_exists
: generic_type_traits_ns::select_system_exists_ns::select_system4_exists<Tag1,Tag2,Tag3,Tag4>
{};
template<typename Tag1, typename Tag2, typename Tag3, typename Tag4, typename Tag5>
struct select_system5_exists
: generic_type_traits_ns::select_system_exists_ns::select_system5_exists<Tag1,Tag2,Tag3,Tag4,Tag5>
{};
template<typename Tag1, typename Tag2, typename Tag3, typename Tag4, typename Tag5, typename Tag6>
struct select_system6_exists
: generic_type_traits_ns::select_system_exists_ns::select_system6_exists<Tag1,Tag2,Tag3,Tag4,Tag5,Tag6>
{};
} // end generic
} // end detail
} // end system
THRUST_NAMESPACE_END
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