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https://github.com/bolero-MURAKAMI/Sprout.git
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add static_variant_visitor
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bolero-MURAKAMI
parent
f01382e3e5
commit
fce61f0def
6 changed files with 103 additions and 41 deletions
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@ -7,6 +7,8 @@
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#include <sprout/variant/tuple.hpp>
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#include <sprout/variant/get.hpp>
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#include <sprout/variant/static_visitor.hpp>
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#include <sprout/variant/static_variant_visitor.hpp>
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#include <sprout/variant/visitor_result.hpp>
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#include <sprout/variant/apply_visitor.hpp>
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#endif // #ifndef SPROUT_VARIANT_HPP
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@ -4,41 +4,9 @@
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/type_traits/has_xxx.hpp>
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#include <sprout/variant/visitor_result.hpp>
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namespace sprout {
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//
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// has_visitor_result
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//
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SPROUT_HAS_XXX_TEMPLATE_DEF_LAZY(visitor_result);
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namespace detail {
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template<typename Visitor, typename Visitable, typename = void>
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struct visitor_result_impl;
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template<typename Visitor, typename Visitable>
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struct visitor_result_impl<
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Visitor, Visitable,
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typename std::enable_if<sprout::has_visitor_result<Visitable>::value>::type
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>
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: public Visitable::template visitor_result<Visitor, Visitable>
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{};
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template<typename Visitor, typename Visitable>
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struct visitor_result_impl<
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Visitor, Visitable,
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typename std::enable_if<!sprout::has_visitor_result<Visitable>::value>::type
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> {
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public:
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typedef typename Visitor::result_type type;
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};
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} // namespace detail
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//
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// visitor_result
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//
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template<typename Visitor, typename Visitable>
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struct visitor_result
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: public sprout::detail::visitor_result_impl<Visitor, Visitable>
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{};
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//
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// apply_visitor
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//
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22
sprout/variant/static_variant_visitor.hpp
Normal file
22
sprout/variant/static_variant_visitor.hpp
Normal file
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@ -0,0 +1,22 @@
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#ifndef SPROUT_VARIANT_STATIC_VARIANT_VISITOR_HPP
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#define SPROUT_VARIANT_STATIC_VARIANT_VISITOR_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/variant/variant.hpp>
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namespace sprout {
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//
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// static_variant_visitor
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//
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class static_variant_visitor {
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public:
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template<typename... Types>
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struct visitor_result {
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public:
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typedef sprout::variant<typename std::decay<Types>::type...> type;
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};
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};
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} // namespace sprout
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#endif // #ifndef SPROUT_VARIANT_STATIC_VARIANT_VISITOR_HPP
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@ -4,6 +4,9 @@
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#include <sprout/config.hpp>
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namespace sprout {
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//
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// static_visitor
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//
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template<typename R = void>
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class static_visitor {
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public:
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@ -16,6 +16,7 @@
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#include <sprout/type/algorithm/find_index.hpp>
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#include <sprout/functional/type_traits/has_type.hpp>
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#include <sprout/functional/type_traits/weak_result_type.hpp>
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#include <sprout/variant/visitor_result.hpp>
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namespace sprout {
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template<typename... Types>
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@ -75,6 +76,15 @@ namespace sprout {
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public:
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typedef typename impl_type::tuple_type tuple_type;
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private:
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template<typename Visitor, typename Tuple, typename IndexTuple>
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struct visitor_result_impl_2;
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template<typename Visitor, typename Tuple, sprout::index_t... Indexes>
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struct visitor_result_impl_2<Visitor, Tuple, sprout::index_tuple<Indexes...> > {
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public:
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typedef typename Visitor::template visitor_result<
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decltype((std::declval<Visitor>())(sprout::tuples::get<Indexes>(std::declval<Tuple>())))...
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>::type type;
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};
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template<typename Visitor, typename Tuple, typename IndexTuple>
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struct visitor_result_impl_1;
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template<typename Visitor, typename Tuple, sprout::index_t... Indexes>
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@ -91,19 +101,35 @@ namespace sprout {
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template<typename Visitor, typename Tuple>
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struct visitor_result_impl<
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Visitor, Tuple,
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typename std::enable_if<!sprout::has_result_type<sprout::weak_result_type<Visitor> >::value>::type
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>
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: public visitor_result_impl_1<Visitor, Tuple, typename sprout::index_range<0, sprout::tuples::tuple_size<Tuple>::value>::type>
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{};
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template<typename Visitor, typename Tuple>
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struct visitor_result_impl<
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Visitor, Tuple,
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typename std::enable_if<sprout::has_result_type<sprout::weak_result_type<Visitor> >::value>::type
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typename std::enable_if<
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sprout::has_result_type<sprout::weak_result_type<Visitor> >::value
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>::type
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> {
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public:
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typedef typename sprout::weak_result_type<Visitor>::result_type type;
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};
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template<typename Visitor, typename Tuple>
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struct visitor_result_impl<
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Visitor, Tuple,
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typename std::enable_if<
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sprout::has_visitor_result<Visitor>::value
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&& !sprout::has_result_type<sprout::weak_result_type<Visitor> >::value
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>::type
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>
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: public visitor_result_impl_2<Visitor, Tuple, typename sprout::index_range<0, sprout::tuples::tuple_size<Tuple>::value>::type>
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{};
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template<typename Visitor, typename Tuple>
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struct visitor_result_impl<
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Visitor, Tuple,
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typename std::enable_if<
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!sprout::has_visitor_result<Visitor>::value
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&& !sprout::has_result_type<sprout::weak_result_type<Visitor> >::value
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>::type
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>
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: public visitor_result_impl_1<Visitor, Tuple, typename sprout::index_range<0, sprout::tuples::tuple_size<Tuple>::value>::type>
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{};
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public:
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// visitation support
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template<typename Visitor, typename Visitable>
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struct visitor_result
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: public visitor_result_impl<Visitor, typename Visitable::tuple_type>
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41
sprout/variant/visitor_result.hpp
Normal file
41
sprout/variant/visitor_result.hpp
Normal file
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@ -0,0 +1,41 @@
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#ifndef SPROUT_VARIANT_VISITOR_RESULT_HPP
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#define SPROUT_VARIANT_VISITOR_RESULT_HPP
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#include <sprout/config.hpp>
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#include <sprout/type_traits/has_xxx.hpp>
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namespace sprout {
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//
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// has_visitor_result
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//
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SPROUT_HAS_XXX_TEMPLATE_DEF_LAZY(visitor_result);
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namespace detail {
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template<typename Visitor, typename Visitable, typename = void>
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struct visitor_result_impl;
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template<typename Visitor, typename Visitable>
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struct visitor_result_impl<
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Visitor, Visitable,
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typename std::enable_if<sprout::has_visitor_result<Visitable>::value>::type
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>
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: public Visitable::template visitor_result<Visitor, Visitable>
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{};
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template<typename Visitor, typename Visitable>
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struct visitor_result_impl<
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Visitor, Visitable,
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typename std::enable_if<!sprout::has_visitor_result<Visitable>::value>::type
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> {
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public:
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typedef typename Visitor::result_type type;
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};
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} // namespace detail
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//
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// visitor_result
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//
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template<typename Visitor, typename Visitable>
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struct visitor_result
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: public sprout::detail::visitor_result_impl<Visitor, Visitable>
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_VARIANT_VISITOR_RESULT_HPP
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