Dangliung

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/core/c++/math/n_closest.hpp b/lib/core/c++/math/n_closest.hpp
new file mode 100644
index 0000000..ddc89be
--- /dev/null
+++ b/lib/core/c++/math/n_closest.hpp
@@ -0,0 +1,24 @@
+#pragma once
+
+#include "../common.hpp"
+#include "../iterator.hpp"
+
+namespace kel {
+namespace lbm {
+
+template<typename FieldSchema, typename T, uint64_t D>
+auto n_closest_read(saw::data<FieldSchema>, const saw::data<sch::Vector<T,D>>& frac_ind){
+
+	auto shift_frac_ind = frac_ind;
+	for(uint64_t i{0u}; i < D; ++i){
+		
+		shift_frac_ind.at({{i}}) = shift_frac_ind.at({{i}})  + saw::data<T>{0.5};
+		if(shift_frac_ind.at({{i}}).get() < 0){
+			shift_frac_ind.at({{i}}) = {};
+		}
+	}
+
+	auto shift_ind = frac_ind.template cast_to<sch::UInt64>();
+}
+}
+}