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Merged
saki7 merged 1 commit into from
Feb 6, 2026
+117 −0
Merged

Implement unsafe_get #14

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81 changes: 81 additions & 0 deletions include/iris/rvariant/rvariant.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1211,6 +1211,87 @@ template<class T, class... Ts>
requires is_ttp_specialization_of_v<T, recursive_wrapper>
constexpr T const&& get(rvariant<Ts...> const&&) = delete;

// -------------------------------------------------

template<std::size_t I, class... Ts>
[[nodiscard]] constexpr variant_alternative_t<I, rvariant<Ts...>>&
unsafe_get(rvariant<Ts...>& v IRIS_LIFETIMEBOUND) noexcept
{
static_assert(I < sizeof...(Ts));
return detail::unwrap_recursive(detail::raw_get<I>(detail::forward_storage<rvariant<Ts...>&>(v)));
}

template<std::size_t I, class... Ts>
[[nodiscard]] constexpr variant_alternative_t<I, rvariant<Ts...>>&&
unsafe_get(rvariant<Ts...>&& v IRIS_LIFETIMEBOUND) noexcept // NOLINT(cppcoreguidelines-rvalue-reference-param-not-moved)
{
static_assert(I < sizeof...(Ts));
return detail::unwrap_recursive(detail::raw_get<I>(detail::forward_storage<rvariant<Ts...>&&>(v)));
}

template<std::size_t I, class... Ts>
[[nodiscard]] constexpr variant_alternative_t<I, rvariant<Ts...>> const&
unsafe_get(rvariant<Ts...> const& v IRIS_LIFETIMEBOUND) noexcept
{
static_assert(I < sizeof...(Ts));
return detail::unwrap_recursive(detail::raw_get<I>(detail::forward_storage<rvariant<Ts...> const&>(v)));
}

template<std::size_t I, class... Ts>
[[nodiscard]] constexpr variant_alternative_t<I, rvariant<Ts...>> const&&
unsafe_get(rvariant<Ts...> const&& v IRIS_LIFETIMEBOUND) noexcept
{
return detail::unwrap_recursive(detail::raw_get<I>(detail::forward_storage<rvariant<Ts...> const&&>(v)));
}

template<class T, class... Ts>
[[nodiscard]] constexpr T&
unsafe_get(rvariant<Ts...>& v IRIS_LIFETIMEBOUND) noexcept
{
constexpr std::size_t I = detail::exactly_once_index_v<T, rvariant<Ts...>>;
return detail::unwrap_recursive(detail::raw_get<I>(detail::forward_storage<rvariant<Ts...>&>(v)));
}

template<class T, class... Ts>
[[nodiscard]] constexpr T&&
unsafe_get(rvariant<Ts...>&& v IRIS_LIFETIMEBOUND) noexcept // NOLINT(cppcoreguidelines-rvalue-reference-param-not-moved)
{
constexpr std::size_t I = detail::exactly_once_index_v<T, rvariant<Ts...>>;
return detail::unwrap_recursive(detail::raw_get<I>(detail::forward_storage<rvariant<Ts...>&&>(v)));
}

template<class T, class... Ts>
[[nodiscard]] constexpr T const&
unsafe_get(rvariant<Ts...> const& v IRIS_LIFETIMEBOUND) noexcept
{
constexpr std::size_t I = detail::exactly_once_index_v<T, rvariant<Ts...>>;
return detail::unwrap_recursive(detail::raw_get<I>(detail::forward_storage<rvariant<Ts...> const&>(v)));
}

template<class T, class... Ts>
[[nodiscard]] constexpr T const&&
unsafe_get(rvariant<Ts...> const&& v IRIS_LIFETIMEBOUND) noexcept
{
constexpr std::size_t I = detail::exactly_once_index_v<T, rvariant<Ts...>>;
return detail::unwrap_recursive(detail::raw_get<I>(detail::forward_storage<rvariant<Ts...> const&&>(v)));
}

template<class T, class... Ts>
requires is_ttp_specialization_of_v<T, recursive_wrapper>
constexpr T& unsafe_get(rvariant<Ts...>&) = delete;

template<class T, class... Ts>
requires is_ttp_specialization_of_v<T, recursive_wrapper>
constexpr T&& unsafe_get(rvariant<Ts...>&&) = delete;

template<class T, class... Ts>
requires is_ttp_specialization_of_v<T, recursive_wrapper>
constexpr T const& unsafe_get(rvariant<Ts...> const&) = delete;

template<class T, class... Ts>
requires is_ttp_specialization_of_v<T, recursive_wrapper>
constexpr T const&& unsafe_get(rvariant<Ts...> const&&) = delete;

// ---------------------------------------------

template<std::size_t I, class... Ts>
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36 changes: 36 additions & 0 deletions test/rvariant/get_visit_test.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -151,6 +151,42 @@ TEST_CASE("get", "[wrapper]")
REQUIRE(iris::get<int>(std::move(var)) == 42);
}
}

TEST_CASE("unsafe_get")
{
{
iris::rvariant<int, float> var = 42;
REQUIRE(iris::unsafe_get<0>(std::as_const(var)) == 42);
REQUIRE(iris::unsafe_get<0>(var) == 42);
REQUIRE(iris::unsafe_get<0>(std::move(std::as_const(var))) == 42);
REQUIRE(iris::unsafe_get<0>(std::move(var)) == 42);
}
{
iris::rvariant<int, float> var = 42;
REQUIRE(iris::unsafe_get<int>(std::as_const(var)) == 42);
REQUIRE(iris::unsafe_get<int>(var) == 42);
REQUIRE(iris::unsafe_get<int>(std::move(std::as_const(var))) == 42);
REQUIRE(iris::unsafe_get<int>(std::move(var)) == 42);
}
}

TEST_CASE("unsafe_get", "[wrapper]")
{
{
iris::rvariant<iris::recursive_wrapper<int>, float> var = 42;
REQUIRE(iris::unsafe_get<0>(std::as_const(var)) == 42);
REQUIRE(iris::unsafe_get<0>(var) == 42);
REQUIRE(iris::unsafe_get<0>(std::move(std::as_const(var))) == 42);
REQUIRE(iris::unsafe_get<0>(std::move(var)) == 42);
}
{
iris::rvariant<iris::recursive_wrapper<int>, float> var = 42;
REQUIRE(iris::unsafe_get<int>(std::as_const(var)) == 42);
REQUIRE(iris::unsafe_get<int>(var) == 42);
REQUIRE(iris::unsafe_get<int>(std::move(std::as_const(var))) == 42);
REQUIRE(iris::unsafe_get<int>(std::move(var)) == 42);
}
}
// NOLINTEND(performance-move-const-arg)

TEST_CASE("get_if")
Expand Down