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File indexing completed on 2025-01-18 09:54:46
0001 //----------------------------------*-C++-*----------------------------------// 0002 // Copyright 2023-2024 UT-Battelle, LLC, and other Celeritas developers. 0003 // See the top-level COPYRIGHT file for details. 0004 // SPDX-License-Identifier: (Apache-2.0 OR MIT) 0005 //---------------------------------------------------------------------------// 0006 //! \file corecel/cont/detail/VariantUtilsImpl.hh 0007 //---------------------------------------------------------------------------// 0008 #pragma once 0009 0010 #include <type_traits> 0011 #include <utility> 0012 #include <variant> 0013 0014 namespace celeritas 0015 { 0016 namespace detail 0017 { 0018 //---------------------------------------------------------------------------// 0019 /*! 0020 * Implementation of \c return_as. 0021 */ 0022 template<class T, class F> 0023 struct ReturnAsImpl 0024 { 0025 F apply; 0026 0027 template<class U> 0028 T operator()(U&& other) 0029 { 0030 return this->apply(std::forward<U>(other)); 0031 } 0032 }; 0033 0034 //---------------------------------------------------------------------------// 0035 /*! 0036 * Implementation for a variant that uses traits based on an enum. 0037 */ 0038 template<class E, template<E> class ETraits> 0039 struct EnumVariantImpl 0040 { 0041 //! Underlying integer for enum 0042 using EInt = std::underlying_type_t<E>; 0043 0044 static_assert(static_cast<EInt>(E::size_) > 0, "ill-defined enumeration"); 0045 0046 //! Compile-time range of all allowable enum integer values 0047 using EIntRange 0048 = std::make_integer_sequence<EInt, static_cast<EInt>(E::size_)>; 0049 0050 //! Map enum integer value to class 0051 template<EInt I> 0052 struct EIntTraits 0053 { 0054 using type = typename ETraits<static_cast<E>(I)>::type; 0055 }; 0056 0057 //!@{ 0058 //! Expand an integer sequence into a variant 0059 template<class Seq> 0060 struct VariantImpl; 0061 template<EInt... Is> 0062 struct VariantImpl<std::integer_sequence<EInt, Is...>> 0063 { 0064 using type = std::variant<typename EIntTraits<Is>::type...>; 0065 }; 0066 //!@} 0067 0068 //! Get a variant with all the surface types 0069 using type = typename VariantImpl<EIntRange>::type; 0070 }; 0071 0072 //---------------------------------------------------------------------------// 0073 } // namespace detail 0074 } // namespace celeritas
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