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162 lines
4.3 KiB
162 lines
4.3 KiB
/* |
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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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#pragma once |
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#include <thrust/detail/type_traits.h> |
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namespace thrust |
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{ |
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namespace detail |
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{ |
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namespace minimum_type_detail |
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{ |
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// |
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// Returns the minimum type or is empty |
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// if T1 and T2 are unrelated. |
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// |
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template <typename T1, typename T2, bool GreaterEqual, bool LessEqual> struct minimum_type_impl {}; |
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template <typename T1, typename T2> |
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struct minimum_type_impl<T1,T2,true,false> |
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{ |
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typedef T2 type; |
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}; // end minimum_type_impl |
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template <typename T1, typename T2> |
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struct minimum_type_impl<T1,T2,false,true> |
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{ |
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typedef T1 type; |
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}; // end minimum_type_impl |
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template <typename T1, typename T2> |
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struct minimum_type_impl<T1,T2,true,true> |
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{ |
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typedef T1 type; |
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}; // end minimum_type_impl |
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template <typename T1, typename T2> |
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struct primitive_minimum_type |
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: minimum_type_detail::minimum_type_impl< |
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T1, |
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T2, |
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::thrust::detail::is_convertible<T1,T2>::value, |
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::thrust::detail::is_convertible<T2,T1>::value |
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> |
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{ |
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}; // end primitive_minimum_type |
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// because some types are not convertible (even to themselves) |
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// specialize primitive_minimum_type for when both types are identical |
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template <typename T> |
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struct primitive_minimum_type<T,T> |
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{ |
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typedef T type; |
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}; // end primitive_minimum_type |
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// XXX this belongs somewhere more general |
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struct any_conversion |
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{ |
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template<typename T> operator T (void); |
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}; |
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} // end minimum_type_detail |
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template<typename T1, |
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typename T2 = minimum_type_detail::any_conversion, |
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typename T3 = minimum_type_detail::any_conversion, |
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typename T4 = minimum_type_detail::any_conversion, |
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typename T5 = minimum_type_detail::any_conversion, |
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typename T6 = minimum_type_detail::any_conversion, |
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typename T7 = minimum_type_detail::any_conversion, |
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typename T8 = minimum_type_detail::any_conversion, |
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typename T9 = minimum_type_detail::any_conversion, |
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typename T10 = minimum_type_detail::any_conversion, |
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typename T11 = minimum_type_detail::any_conversion, |
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typename T12 = minimum_type_detail::any_conversion, |
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typename T13 = minimum_type_detail::any_conversion, |
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typename T14 = minimum_type_detail::any_conversion, |
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typename T15 = minimum_type_detail::any_conversion, |
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typename T16 = minimum_type_detail::any_conversion> |
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struct minimum_type; |
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// base case |
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template<typename T1, typename T2> |
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struct minimum_type<T1,T2> |
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: minimum_type_detail::primitive_minimum_type<T1,T2> |
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{}; |
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template<typename T1, typename T2> |
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struct lazy_minimum_type |
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: minimum_type< |
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typename T1::type, |
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typename T2::type |
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> |
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{}; |
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// carefully avoid referring to a nested ::type which may not exist |
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template<typename T1, typename T2, typename T3, typename T4, |
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typename T5, typename T6, typename T7, typename T8, |
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typename T9, typename T10, typename T11, typename T12, |
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typename T13, typename T14, typename T15, typename T16> |
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struct minimum_type |
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: lazy_minimum_type< |
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lazy_minimum_type< |
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lazy_minimum_type< |
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minimum_type< |
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T1,T2 |
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>, |
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minimum_type< |
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T3,T4 |
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> |
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>, |
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lazy_minimum_type< |
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minimum_type< |
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T5,T6 |
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>, |
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minimum_type< |
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T7,T8 |
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> |
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> |
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>, |
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lazy_minimum_type< |
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lazy_minimum_type< |
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minimum_type< |
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T9,T10 |
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>, |
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minimum_type< |
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T11,T12 |
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> |
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>, |
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lazy_minimum_type< |
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minimum_type< |
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T13,T14 |
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>, |
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minimum_type< |
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T15,T16 |
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> |
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> |
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> |
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> |
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{}; |
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} // end detail |
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} // end thrust |
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