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dispatch_curve_creation based on template magic instead of dynamic casting

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Thomas Krijnen
2024-08-23 20:36:47 +02:00
parent a1527a7e31
commit b0b65e550c
1 changed files with 17 additions and 4 deletions
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src/ifcgeom/AbstractKernel.h
+17 -4
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@@ -102,14 +102,27 @@ namespace {
}
};
template <class T, class Tuple>
struct TupleTypeIndex;
template <class T, class... Types>
struct TupleTypeIndex<T, std::tuple<T, Types...>> {
static const std::size_t value = 0;
};
template <class T, class U, class... Types>
struct TupleTypeIndex<T, std::tuple<U, Types...>> {
static const std::size_t value = 1 + TupleTypeIndex<T, std::tuple<Types...>>::value;
};
/* A compile-time for loop over the curve kinds */
template <typename T, size_t N = 0>
struct dispatch_curve_creation {
static bool dispatch(const ifcopenshell::geometry::taxonomy::ptr item, T& visitor) {
// @todo it should be possible to eliminate this dynamic_cast when there is a static equivalent to kind()
auto v = ifcopenshell::geometry::taxonomy::template dcast<ifcopenshell::geometry::taxonomy::curves::type<N>>(item);
if (v && item->kind() == v->kind()) {
visitor(v);
constexpr auto KindIndex = TupleTypeIndex<std::tuple_element_t<N, ifcopenshell::geometry::taxonomy::impl::CurvesTuple>, ifcopenshell::geometry::taxonomy::impl::KindsTuple>::value;
if (item->kind() == KindIndex) {
auto concrete_item = ifcopenshell::geometry::taxonomy::template cast<ifcopenshell::geometry::taxonomy::curves::type<N>>(item);
visitor(concrete_item);
return true;
} else {
return dispatch_curve_creation<T, N + 1>::dispatch(item, visitor);