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Added etl::type_list to etl::nth_type

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This commit is contained in:
John Wellbelove 2026-01-21 09:50:15 +01:00
parent 2cae496620
commit 2862b3b247
2 changed files with 19 additions and 0 deletions
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8
include/etl/nth_type.h
View File

@ -31,6 +31,7 @@ SOFTWARE.
#include "platform.h"
#include "static_assert.h"
#include "type_list.h"
#if ETL_USING_CPP11
namespace etl
@ -60,6 +61,13 @@ namespace etl
using type = typename private_nth_type::nth_type_helper<Index, TTypes...>::type;
};
//***********************************
template <size_t Index, typename... TTypes>
struct nth_type<Index, etl::type_list<TTypes...>> : public nth_type<Index, TTypes...>
{
using nth_type<Index, TTypes...>::type;
};
//***********************************
template <size_t Index, typename... TTypes>
using nth_type_t = typename nth_type<Index, TTypes...>::type;

11
test/test_nth_type.cpp
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@ -29,6 +29,7 @@ SOFTWARE.
#include "unit_test_framework.h"
#include "etl/nth_type.h"
#include "etl/type_list.h"
#include <type_traits>
namespace
@ -42,5 +43,15 @@ namespace
CHECK((std::is_same<etl::nth_type_t<1, int, long, double>, long>::value));
CHECK((std::is_same<etl::nth_type_t<2, int, long, double>, double>::value));
}
//*************************************************************************
TEST(test_nth_type_from_type_list)
{
using types = etl::type_list<int, long, double>;
CHECK((std::is_same<etl::nth_type_t<0, types>, int>::value));
CHECK((std::is_same<etl::nth_type_t<1, types>, long>::value));
CHECK((std::is_same<etl::nth_type_t<2, types>, double>::value));
}
}
}