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Allow for structured bindings from const camp::tuple #140

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merged 4 commits into from
Oct 17, 2023
Merged

Allow for structured bindings from const camp::tuple #140

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a478681
implementation of std::tuple_element that allows const auto [a,b] = t…
rrsettgast Oct 16, 2023
092fe59
downgrade std::is_same_v to std::is_same<>::value
rrsettgast Oct 16, 2023
2128a4d
downgrade std::is_same_v to std::is_same<>::value
rrsettgast Oct 16, 2023
b259398
removed some debugging output
rrsettgast Oct 16, 2023
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4 changes: 2 additions & 2 deletions include/camp/tuple.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -703,7 +703,7 @@ namespace std {

template <size_t i, typename ... T>
struct tuple_element<i, camp::tuple<T...>> {
using type = decltype(camp::get<i>(camp::tuple<T...>{}));
using type = ::camp::tuple_element_t<i, camp::tuple<T...>>;
};

/// This allows structured bindings to be used with camp::tagged_tuple
Expand All @@ -718,7 +718,7 @@ namespace std {

template <size_t i, typename TagList, typename... Elements>
struct tuple_element<i, camp::tagged_tuple<TagList, Elements...>> {
using type = decltype(camp::get<i>(camp::tagged_tuple<TagList, Elements...>{}));
using type = ::camp::tuple_element_t<i, camp::tagged_tuple<TagList, Elements...>>;
};
} // namespace std
#endif
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37 changes: 37 additions & 0 deletions test/tuple.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -360,6 +360,43 @@ TEST(CampTuple, StructuredBindings)
{
auto t = camp::make_tuple(3, 9.9);
auto [a, b] = t;
static_assert(std::is_same< decltype(a), int >::value );
static_assert(std::is_same< decltype(b), double >::value );
ASSERT_EQ(a, 3);
ASSERT_NEAR(b, 9.9, 1e-15);
}

TEST(CampTuple, StructuredBindingsConst)
{
auto t = camp::make_tuple(3, 9.9);
const auto [a, b] = t;
static_assert(std::is_same< decltype(a), const int >::value );
static_assert(std::is_same< decltype(b), const double >::value );
ASSERT_EQ(a, 3);
ASSERT_NEAR(b, 9.9, 1e-15);
}

TEST(CampTuple, StructuredBindingsRef)
{
auto t = camp::make_tuple(3, 9.9);
auto & [a, b] = t;
static_assert(std::is_same< decltype(a), int >::value ); // Not an int &
static_assert(std::is_same< decltype(b), double >::value ); // Not a double &
ASSERT_EQ(a, 3);
ASSERT_NEAR(b, 9.9, 1e-15);

a = 4; // Well...kind of an int &
b = 10.1; // also kind of a double &
ASSERT_EQ(camp::get<0>(t), 4);
ASSERT_NEAR(camp::get<1>(t), 10.1, 1e-15);
}

TEST(CampTuple, StructuredBindingsRefConst)
{
auto t = camp::make_tuple(3, 9.9);
const auto & [a, b] = t;
static_assert(std::is_same< decltype(a), const int >::value ); // Not an const int &
static_assert(std::is_same< decltype(b), const double >::value ); // Not a const double &
ASSERT_EQ(a, 3);
ASSERT_NEAR(b, 9.9, 1e-15);
}
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