ND Spline Evaluator

CMakeLists.txt

@@ -154,6 +154,15 @@ target_sources(
                 src/ddc/detail/kokkos.hpp
                 src/ddc/detail/macros.hpp
                 src/ddc/detail/tagged_vector.hpp
+                src/ddc/detail/tuple/impl/apply.hpp
+                src/ddc/detail/tuple/impl/creation.hpp
+                src/ddc/detail/tuple/impl/helper.hpp
+                src/ddc/detail/tuple/impl/ignore.hpp
+                src/ddc/detail/tuple/impl/macros.hpp
+                src/ddc/detail/tuple/impl/traits.hpp
+                src/ddc/detail/tuple/impl/tuple.hpp
+                src/ddc/detail/tuple/impl/tuple_fwd.hpp
+                src/ddc/detail/tuple/tuple.hpp
                 src/ddc/detail/type_seq.hpp
                 src/ddc/detail/utils.hpp
                 src/ddc/aligned_allocator.hpp
@@ -321,6 +330,7 @@ if("${DDC_BUILD_KERNELS_SPLINES}")
                     src/ddc/kernels/splines/spline_evaluator.hpp
                     src/ddc/kernels/splines/spline_evaluator_2d.hpp
                     src/ddc/kernels/splines/spline_evaluator_3d.hpp
+                    src/ddc/kernels/splines/spline_evaluator_nd.hpp
                     src/ddc/kernels/splines/spline_traits.hpp
                     src/ddc/kernels/splines/splines_linear_problem.hpp
                     src/ddc/kernels/splines/splines_linear_problem_2x2_blocks.hpp

LICENSES/Apache-2.0.txt

@@ -0,0 +1,73 @@
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LICENSES/LLVM-exception.txt

@@ -0,0 +1,15 @@
+---- LLVM Exceptions to the Apache 2.0 License ----
+
+   As an exception, if, as a result of your compiling your source code, portions
+   of this Software are embedded into an Object form of such source code, you
+   may redistribute such embedded portions in such Object form without complying
+   with the conditions of Sections 4(a), 4(b) and 4(d) of the License.
+
+   In addition, if you combine or link compiled forms of this Software with
+   software that is licensed under the GPLv2 ("Combined Software") and if a
+   court of competent jurisdiction determines that the patent provision (Section
+   3), the indemnity provision (Section 9) or other Section of the License
+   conflicts with the conditions of the GPLv2, you may retroactively and
+   prospectively choose to deem waived or otherwise exclude such Section(s) of
+   the License, but only in their entirety and only with respect to the Combined
+   Software.

src/ddc/ddc.hpp

@@ -40,6 +40,7 @@ namespace ddc {
 #include "detail/kokkos.hpp"
 #include "detail/macros.hpp"
 #include "detail/tagged_vector.hpp"
+#include "detail/tuple/tuple.hpp"
 #include "detail/type_seq.hpp"
 #include "detail/utils.hpp"
 

src/ddc/detail/tuple/impl/apply.hpp

@@ -0,0 +1,159 @@
+// NOLINTBEGIN(readability-identifier-naming)
+// SPDX-FileCopyrightText: 2026 CExA-project
+// SPDX-License-Identifier: MIT or Apache-2.0 with LLVM-exception
+#pragma once
+
+#include <type_traits>
+#include <utility>
+
+#include "macros.hpp"
+#include "traits.hpp"
+#include "tuple.hpp"
+
+#if defined(CEXA_HAS_CXX23)
+#    include <functional>
+#endif
+
+namespace cexa {
+
+namespace impl {
+template <class>
+constexpr bool is_reference_wrapper_v = false;
+template <class U>
+constexpr bool is_reference_wrapper_v<std::reference_wrapper<U>> = true;
+
+template <class C, class Pointed, class Object, class... Args>
+KOKKOS_INLINE_FUNCTION constexpr decltype(auto) invoke_ptr(
+        Pointed C::* member,
+        Object&& object,
+        Args&&... args)
+{
+    using object_t = std::remove_cvref_t<Object>;
+    constexpr bool is_wrapped = is_reference_wrapper_v<object_t>;
+    constexpr bool is_derived_object
+            = std::is_same_v<C, object_t> || std::is_base_of_v<C, object_t>;
+
+    if constexpr (std::is_function_v<Pointed>) {
+        if constexpr (is_derived_object) {
+            return (std::forward<Object>(object).*member)(std::forward<Args>(args)...);
+        } else if constexpr (is_wrapped) {
+            return (object.get().*member)(std::forward<Args>(args)...);
+        } else {
+            return ((*std::forward<Object>(object)).*member)(std::forward<Args>(args)...);
+        }
+    } else {
+        static_assert(std::is_object_v<Pointed> && sizeof...(args) == 0);
+        if constexpr (is_derived_object) {
+            return std::forward<Object>(object).*member;
+        } else if constexpr (is_wrapped) {
+            return object.get().*member;
+        } else {
+            return (*std::forward<Object>(object)).*member;
+        }
+    }
+}
+
+// f may be a host function
+CEXA_NVCC_HOST_DEVICE_CHECK_DISABLE
+template <class F, class... Args>
+KOKKOS_INLINE_FUNCTION constexpr decltype(auto) invoke(F&& f, Args&&... args)
+{
+    if constexpr (std::is_member_pointer_v<std::remove_cvref_t<F>>) {
+        return invoke_ptr(f, std::forward<Args>(args)...);
+    } else {
+        return (std::forward<F>(f))(std::forward<Args>(args)...);
+    }
+}
+
+template <class F, class Tuple, std::size_t... I>
+KOKKOS_INLINE_FUNCTION constexpr decltype(auto) apply(F&& f, Tuple&& t, std::index_sequence<I...>)
+{
+    return invoke(std::forward<F>(f), cexa::get<I>(std::forward<Tuple>(t))...);
+}
+
+// This might call a host only constructor
+CEXA_NVCC_HOST_DEVICE_CHECK_DISABLE
+template <class T, class Tuple, std::size_t... I>
+KOKKOS_INLINE_FUNCTION constexpr T make_from_tuple(Tuple&& t, std::index_sequence<I...>)
+{
+    return T(cexa::get<I>(std::forward<Tuple>(t))...);
+}
+
+template <class U, class T, std::size_t = tuple_size_v<std::remove_cvref_t<T>>>
+struct make_tuple_constraint : std::true_type
+{
+};
+
+template <class U, class Tuple>
+struct make_tuple_constraint<U, Tuple, 1>
+{
+    static constexpr bool value = !impl::reference_constructs_from_temporary_v<
+            U,
+            decltype(get<0>(std::declval<Tuple>()))>;
+};
+
+template <class T, class Tuple, class Seq>
+struct is_constructible_from_tuple;
+
+template <class T, class Tuple, std::size_t... Ints>
+struct is_constructible_from_tuple<T, Tuple, std::index_sequence<Ints...>>
+{
+    static constexpr bool value
+            = std::is_constructible_v<T, decltype(get<Ints>(std::declval<Tuple>()))...>;
+};
+
+template <class T, class Tuple>
+inline constexpr bool is_constructible_from_tuple_v = is_constructible_from_tuple<
+        T,
+        Tuple,
+        std::make_index_sequence<tuple_size_v<std::remove_cvref_t<Tuple>>>>::value;
+
+#if defined(CEXA_HAS_CXX23)
+template <class F, class Tuple, class Other>
+struct is_nothrow_applicable : std::false_type
+{
+};
+
+template <class F, class Tuple, std::size_t... Is>
+struct is_nothrow_applicable<F, Tuple, std::index_sequence<Is...>>
+{
+    static constexpr bool value
+            = noexcept(std::invoke(std::declval<F>(), get<Is>(std::declval<Tuple>())...));
+};
+
+template <class F, class Tuple>
+constexpr bool is_nothrow_applicable_v = is_nothrow_applicable<
+        F,
+        Tuple,
+        decltype(std::make_index_sequence<tuple_size_v<std::remove_cvref_t<Tuple>>> {})>::value;
+#endif
+} // namespace impl
+
+template <class F, class Tuple>
+KOKKOS_INLINE_FUNCTION constexpr decltype(auto) apply(F&& f, Tuple&& t)
+#if defined(CEXA_HAS_CXX23)
+        noexcept(impl::is_nothrow_applicable_v<F, Tuple>)
+#endif
+{
+    static_assert(
+            impl::is_tuple_v<std::remove_cvref_t<Tuple>>,
+            "cexa::apply can only be called with cexa::tuple");
+    return impl::
+            apply(std::forward<F>(f),
+                  std::forward<Tuple>(t),
+                  std::make_index_sequence<tuple_size_v<std::remove_reference_t<Tuple>>> {});
+}
+
+template <class T, class Tuple>
+    requires impl::is_constructible_from_tuple_v<T, Tuple>
+KOKKOS_INLINE_FUNCTION constexpr T make_from_tuple(Tuple&& t)
+{
+    static_assert(
+            impl::is_tuple_v<std::remove_cvref_t<Tuple>>,
+            "cexa::make_from_tuple can only be called with cexa::tuple");
+    constexpr std::size_t size = tuple_size_v<std::remove_reference_t<Tuple>>;
+    static_assert(impl::make_tuple_constraint<T, std::remove_cvref_t<Tuple>>::value);
+    return impl::make_from_tuple<T>(std::forward<Tuple>(t), std::make_index_sequence<size> {});
+}
+} // namespace cexa
+// NOLINTEND(readability-identifier-naming)