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This adds the variant implementation to Backport, complete with proper constexpr, trivial destructor, and unit tests! Currently absent is a proper implementation of 'visit' to work with multiple variants -- to be added at a later time. Closes #1
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| /***************************************************************************** | ||
| * \file nth_type.hpp | ||
| * | ||
| * \brief This internal header provides the definition of the INVOKE overload | ||
| *****************************************************************************/ | ||
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| /* | ||
| The MIT License (MIT) | ||
| Copyright (c) 2020 Matthew Rodusek All rights reserved. | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in | ||
| all copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. | ||
| */ | ||
| #ifndef BPSTD_DETAIL_NTH_TYPE_HPP | ||
| #define BPSTD_DETAIL_NTH_TYPE_HPP | ||
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| #if defined(_MSC_VER) && (_MSC_VER >= 1200) | ||
| # pragma once | ||
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | ||
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| #include <cstddef> // std::size_t | ||
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| namespace bpstd { | ||
| namespace detail { | ||
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| /// \brief Gets the nth type from a variadic pack of arguments | ||
| /// | ||
| /// \tparam N the argument to retrieve | ||
| /// \tparam Args the arguments to extract from | ||
| template <std::size_t N, typename...Args> | ||
| struct nth_type; | ||
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| template <std::size_t N, typename Arg0, typename...Args> | ||
| struct nth_type<N,Arg0,Args...> : nth_type<N-1,Args...>{}; | ||
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| template <typename Arg0, typename...Args> | ||
| struct nth_type<0,Arg0,Args...> | ||
| { | ||
| using type = Arg0; | ||
| }; | ||
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| template <std::size_t N, typename...Args> | ||
| using nth_type_t = typename nth_type<N,Args...>::type; | ||
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| } // namespace detail | ||
| } // namespace bpstd | ||
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| #endif /* BPSTD_DETAIL_NTH_TYPE_HPP */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,227 @@ | ||
| /***************************************************************************** | ||
| * \file variant_base.hpp | ||
| * | ||
| * \brief This internal header provides the definition of a utility for | ||
| * variant, variant_base | ||
| *****************************************************************************/ | ||
|
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| /* | ||
| The MIT License (MIT) | ||
| Copyright (c) 2020 Matthew Rodusek All rights reserved. | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in | ||
| all copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. | ||
| */ | ||
| #ifndef BPSTD_DETAIL_VARIANT_BASE_HPP | ||
| #define BPSTD_DETAIL_VARIANT_BASE_HPP | ||
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| #include "config.hpp" // BPSTD_CPP14_CONSTEXPR | ||
| #include "variant_union.hpp" // detail::variant_union | ||
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| #include <cstddef> // std::size_t | ||
| #include <utility> // std::forward | ||
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| namespace bpstd { | ||
| namespace detail { | ||
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| //========================================================================== | ||
| // class : variant_base | ||
| //========================================================================== | ||
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| //////////////////////////////////////////////////////////////////////////// | ||
| /// \brief The base class used by variant | ||
| //////////////////////////////////////////////////////////////////////////// | ||
| template <bool IsTrivial, typename...Types> | ||
| class variant_base; | ||
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| //========================================================================== | ||
| // class : variant_base<true, Types...> | ||
| //========================================================================== | ||
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| template <typename...Types> | ||
| class variant_base<true,Types...> | ||
| { | ||
| //------------------------------------------------------------------------ | ||
| // Constructors | ||
| //------------------------------------------------------------------------ | ||
| public: | ||
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| constexpr variant_base(); | ||
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| template <std::size_t N, typename...Args> | ||
| constexpr variant_base(variant_index_tag<N>, Args&&...args); | ||
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| //------------------------------------------------------------------------ | ||
| // Protected Members | ||
| //------------------------------------------------------------------------ | ||
| protected: | ||
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| variant_union<true,Types...> m_union; | ||
| std::size_t m_index; | ||
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| //--------------------------------------------------------------------- | ||
| // Protected Member Functions | ||
| //--------------------------------------------------------------------- | ||
| protected: | ||
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| void destroy_active_object(); | ||
| }; | ||
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| //========================================================================== | ||
| // class : variant_base<false, Types...> | ||
| //========================================================================== | ||
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| template <typename...Types> | ||
| class variant_base<false,Types...> | ||
| { | ||
| public: | ||
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| constexpr variant_base(); | ||
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| template <std::size_t N, typename...Args> | ||
| constexpr variant_base(variant_index_tag<N>, Args&&...args); | ||
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| ~variant_base(); | ||
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| //--------------------------------------------------------------------- | ||
| // Protected Members | ||
| //--------------------------------------------------------------------- | ||
| protected: | ||
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| variant_union<false,Types...> m_union; | ||
| std::size_t m_index; | ||
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| //--------------------------------------------------------------------- | ||
| // Protected Member Functions | ||
| //--------------------------------------------------------------------- | ||
| protected: | ||
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| void destroy_active_object(); | ||
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| //--------------------------------------------------------------------- | ||
| // Private Static Member Functions | ||
| //--------------------------------------------------------------------- | ||
| private: | ||
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| struct destroy_visitor | ||
| { | ||
| template <typename T> | ||
| inline BPSTD_INLINE_VISIBILITY | ||
| void operator()(T& v) { | ||
| v.~T(); | ||
| } | ||
| }; | ||
| }; | ||
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| } // namespace detail | ||
| } // namespace bpstd | ||
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| //============================================================================== | ||
| // class : variant_base<true, Types...> | ||
| //============================================================================== | ||
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| //------------------------------------------------------------------------------ | ||
| // Constructors | ||
| //------------------------------------------------------------------------------ | ||
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| template <typename...Types> | ||
| inline BPSTD_INLINE_VISIBILITY constexpr | ||
| bpstd::detail::variant_base<true,Types...>::variant_base() | ||
| : m_union{}, | ||
| m_index{static_cast<std::size_t>(-1)} | ||
| { | ||
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| } | ||
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| template <typename...Types> | ||
| template <std::size_t N, typename...Args> | ||
| inline BPSTD_INLINE_VISIBILITY constexpr | ||
| bpstd::detail::variant_base<true,Types...>::variant_base(variant_index_tag<N>, | ||
| Args&&...args) | ||
| : m_union{variant_index_tag<N>{}, std::forward<Args>(args)...}, | ||
| m_index{N} | ||
| { | ||
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| } | ||
|
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| //------------------------------------------------------------------------------ | ||
| // Protected Members | ||
| //------------------------------------------------------------------------------ | ||
|
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| template <typename...Types> | ||
| inline BPSTD_INLINE_VISIBILITY | ||
| void bpstd::detail::variant_base<true,Types...>::destroy_active_object() | ||
| { | ||
| m_index = static_cast<std::size_t>(-1); | ||
| } | ||
|
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| //============================================================================== | ||
| // class : variant_base<false, Types...> | ||
| //============================================================================== | ||
|
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| //------------------------------------------------------------------------------ | ||
| // Constructors / Destructor | ||
| //------------------------------------------------------------------------------ | ||
|
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| template <typename...Types> | ||
| inline BPSTD_INLINE_VISIBILITY constexpr | ||
| bpstd::detail::variant_base<false,Types...>::variant_base() | ||
| : m_union{}, | ||
| m_index{static_cast<std::size_t>(-1)} | ||
| { | ||
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| } | ||
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| template <typename...Types> | ||
| template <std::size_t N, typename...Args> | ||
| inline BPSTD_INLINE_VISIBILITY constexpr | ||
| bpstd::detail::variant_base<false,Types...>::variant_base(variant_index_tag<N>, | ||
| Args&&...args) | ||
| : m_union{variant_index_tag<N>{}, std::forward<Args>(args)...}, | ||
| m_index{N} | ||
| { | ||
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| } | ||
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| //------------------------------------------------------------------------------ | ||
|
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| template <typename...Types> | ||
| inline BPSTD_INLINE_VISIBILITY | ||
| bpstd::detail::variant_base<false,Types...>::~variant_base() | ||
| { | ||
| destroy_active_object(); | ||
| } | ||
|
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| //------------------------------------------------------------------------------ | ||
| // Protected Members | ||
| //------------------------------------------------------------------------------ | ||
|
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| template <typename...Types> | ||
| inline BPSTD_INLINE_VISIBILITY | ||
| void bpstd::detail::variant_base<false,Types...>::destroy_active_object() | ||
| { | ||
| if (m_index == static_cast<std::size_t>(-1)) { | ||
| return; | ||
| } | ||
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| visit_union(m_index, destroy_visitor{}, m_union); | ||
| m_index = static_cast<std::size_t>(-1); | ||
| } | ||
|
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| #endif /* BPSTD_DETAIL_VARIANT_BASE_HPP */ |
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