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Add type_list functionality to etl::visitor using etl::visitor_from_type_list

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This commit is contained in:
John Wellbelove 2026-01-28 17:42:25 +00:00
parent a61980660f
commit bde8747be8
3 changed files with 24 additions and 13 deletions
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23
include/etl/visitor.h
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@ -84,23 +84,20 @@ namespace etl
virtual void accept(T1&) = 0;
};
//*****************************************************************
/// The visitable class for an etl::type_list.
/// Expands the type_list into the existing variadic visitable.
///\ingroup visitor
//*****************************************************************
//***************************************************************************
/// Helper to turn etl::type_list<TTypes...> into etl::visitable<TTypes...>
template <typename TList>
struct visitable_from_type_list;
template <typename... TTypes>
class visitable<etl::type_list<TTypes...>> : public visitable<TTypes...>
struct visitable_from_type_list<etl::type_list<TTypes...>>
{
ETL_STATIC_ASSERT(sizeof...(TTypes) != 0, "etl::type_list must not be empty");
public:
using type_list = etl::type_list<TTypes...>;
using visitable<TTypes...>::accept;
using type = etl::visitable<TTypes...>;
};
template <typename TTypeList>
using visitable_from_type_list_t = typename visitable_from_type_list<TTypeList>::type;
#else
//*****************************************************************

1
test/etl_profile.h
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@ -110,6 +110,7 @@ SOFTWARE.
#define ETL_FLAT_SET_FORCE_CPP03_IMPLEMENTATION
#define ETL_FLAT_MULTISET_FORCE_CPP03_IMPLEMENTATION
#define ETL_VARIANT_POOL_FORCE_CPP03_IMPLEMENTATION
#define ETL_VISITOR_FORCE_CPP03_IMPLEMENTATION
#endif
#if defined(ETL_FORCE_TEST_CPP11)

13
test/test_visitor.cpp
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@ -746,6 +746,19 @@ namespace
CHECK_FALSE(etl::is_visitor<NotVisitor>::value);
#endif
}
#if !defined(ETL_VISITOR_FORCE_CPP03_IMPLEMENTATION)
//*************************************************************************
TEST(test_visitable_from_type_list)
{
using Visitable1 = etl::visitable<DrawVisitorType, LogVisitorType>;
using TypeList = etl::type_list<DrawVisitorType, LogVisitorType>;
using Visitable2 = etl::visitable_from_type_list_t<TypeList>;
CHECK_TRUE((std::is_same<Visitable1, Visitable2>::value));
}
#endif
}
}