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169 lines
4.9 KiB
169 lines
4.9 KiB
11 years ago
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/*
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* Copyright 2008-2012 NVIDIA Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*! \file generic/type_traits.h
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* \brief Introspection for free functions defined in generic.
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*/
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#pragma once
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#include <thrust/detail/config.h>
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namespace thrust
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{
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// forward declaration of any_system_tag for any_conversion below
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struct any_system_tag;
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namespace system
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{
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namespace detail
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{
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// we must define these traits outside of generic's namespace
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namespace generic_type_traits_ns
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{
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typedef char yes;
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typedef char (&no)[2];
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struct any_conversion
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{
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template<typename T> any_conversion(const T &);
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// add this extra constructor to disambiguate conversion from any_system_tag
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any_conversion(const any_system_tag &);
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};
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namespace select_system_exists_ns
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{
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no select_system(const any_conversion &);
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no select_system(const any_conversion &, const any_conversion &);
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no select_system(const any_conversion &, const any_conversion &, const any_conversion &);
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no select_system(const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &);
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no select_system(const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &);
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no select_system(const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &, const any_conversion &);
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template<typename T> yes check(const T &);
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no check(no);
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template<typename Tag>
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struct select_system1_exists
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{
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static Tag &tag;
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static const bool value = sizeof(check(select_system(tag))) == sizeof(yes);
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};
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template<typename Tag1, typename Tag2>
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struct select_system2_exists
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{
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static Tag1 &tag1;
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static Tag2 &tag2;
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static const bool value = sizeof(check(select_system(tag1,tag2))) == sizeof(yes);
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};
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template<typename Tag1, typename Tag2, typename Tag3>
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struct select_system3_exists
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{
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static Tag1 &tag1;
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static Tag2 &tag2;
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static Tag3 &tag3;
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static const bool value = sizeof(check(select_system(tag1,tag2,tag3))) == sizeof(yes);
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};
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template<typename Tag1, typename Tag2, typename Tag3, typename Tag4>
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struct select_system4_exists
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{
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static Tag1 &tag1;
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static Tag2 &tag2;
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static Tag3 &tag3;
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static Tag4 &tag4;
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static const bool value = sizeof(check(select_system(tag1,tag2,tag3,tag4))) == sizeof(yes);
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};
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template<typename Tag1, typename Tag2, typename Tag3, typename Tag4, typename Tag5>
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struct select_system5_exists
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{
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static Tag1 &tag1;
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static Tag2 &tag2;
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static Tag3 &tag3;
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static Tag4 &tag4;
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static Tag5 &tag5;
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static const bool value = sizeof(check(select_system(tag1,tag2,tag3,tag4,tag5))) == sizeof(yes);
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};
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template<typename Tag1, typename Tag2, typename Tag3, typename Tag4, typename Tag5, typename Tag6>
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struct select_system6_exists
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{
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static Tag1 &tag1;
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static Tag2 &tag2;
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static Tag3 &tag3;
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static Tag4 &tag4;
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static Tag5 &tag5;
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static Tag6 &tag6;
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static const bool value = sizeof(check(select_system(tag1,tag2,tag3,tag4,tag5,tag6))) == sizeof(yes);
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};
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} // end select_system_exists_ns
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} // end generic_type_traits_ns
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namespace generic
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{
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template<typename Tag>
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struct select_system1_exists
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: generic_type_traits_ns::select_system_exists_ns::select_system1_exists<Tag>
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{};
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template<typename Tag1, typename Tag2>
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struct select_system2_exists
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: generic_type_traits_ns::select_system_exists_ns::select_system2_exists<Tag1,Tag2>
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{};
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template<typename Tag1, typename Tag2, typename Tag3>
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struct select_system3_exists
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: generic_type_traits_ns::select_system_exists_ns::select_system3_exists<Tag1,Tag2,Tag3>
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{};
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template<typename Tag1, typename Tag2, typename Tag3, typename Tag4>
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struct select_system4_exists
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: generic_type_traits_ns::select_system_exists_ns::select_system4_exists<Tag1,Tag2,Tag3,Tag4>
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{};
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template<typename Tag1, typename Tag2, typename Tag3, typename Tag4, typename Tag5>
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struct select_system5_exists
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: generic_type_traits_ns::select_system_exists_ns::select_system5_exists<Tag1,Tag2,Tag3,Tag4,Tag5>
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{};
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template<typename Tag1, typename Tag2, typename Tag3, typename Tag4, typename Tag5, typename Tag6>
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struct select_system6_exists
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: generic_type_traits_ns::select_system_exists_ns::select_system6_exists<Tag1,Tag2,Tag3,Tag4,Tag5,Tag6>
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{};
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} // end generic
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} // end detail
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} // end system
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} // end thrust
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