From a7420c5f5f56bb21de0241ed152ad9b55965d42d Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Fri, 30 Jan 2026 19:08:54 +0100
Subject: Simulation works partially. Reconfirm with writing data out

---
 lib/core/c++/chunk.hpp | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

(limited to 'lib/core/c++/chunk.hpp')

diff --git a/lib/core/c++/chunk.hpp b/lib/core/c++/chunk.hpp
index 5d20faa..a1f2451 100644
--- a/lib/core/c++/chunk.hpp
+++ b/lib/core/c++/chunk.hpp
@@ -35,6 +35,7 @@ using SuperChunk = Array<ChunkSchema,Dim>;
 }
 
 namespace saw {
+
 template<typename Sch, uint64_t Ghost, uint64_t... Sides, typename Encode>
 class data<kel::lbm::sch::Chunk<Sch,Ghost,Sides...>,Encode> final {
 public:
@@ -57,19 +58,21 @@ public:
 		return data<InnerSchema,Encode>::get_dims();
 	}
 
-	data<ValueSchema, Encode>& at(const data<schema::FixedArray<schema::UInt64,sizeof...(Sides)>>& index){
+	static constexpr auto to_ghost_index(const data<schema::FixedArray<schema::UInt64,sizeof...(Sides)>>& index){
 		std::decay_t<decltype(index)> ind;
 		for(uint64_t i = 0u; i < sizeof...(Sides); ++i){
 			ind.at({i}) = index.at({i}) + Ghost;
 		}
+		return ind;
+	}
+
+	data<ValueSchema, Encode>& at(const data<schema::FixedArray<schema::UInt64,sizeof...(Sides)>>& index){
+		std::decay_t<decltype(index)> ind = to_ghost_index(index);
 		return values_.at(ind);
 	}
 
 	const data<ValueSchema, Encode>& at(const data<schema::FixedArray<schema::UInt64,sizeof...(Sides)>>& index) const {
-		std::decay_t<decltype(index)> ind;
-		for(uint64_t i = 0u; i < sizeof...(Sides); ++i){
-			ind.at({i}) = index.at({i}) + Ghost;
-		}
+		std::decay_t<decltype(index)> ind = to_ghost_index(index);
 		return values_.at(ind);
 	}
 
-- 
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