From a77c3a2301cdc6ea220c3bac18b771fd42800687 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Wed, 7 May 2025 13:39:51 +0200
Subject: Stack smashing probably due to UB fixed

---
 c++/write_vtk.hpp   | 10 ++++++++++
 tests/particles.cpp |  8 ++++++++
 tests/vtk_write.cpp |  2 +-
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/c++/write_vtk.hpp b/c++/write_vtk.hpp
index fec4ea5..294ec6d 100644
--- a/c++/write_vtk.hpp
+++ b/c++/write_vtk.hpp
@@ -31,6 +31,14 @@ struct lbm_vtk_writer<sch::FixedArray<T,D>> {
 	}
 };
 
+template<typename Sch, typename Desc, uint64_t SC_V, uint64_t DC_V, uint64_t QC_V>
+struct lbm_vtk_writer<sch::Cell<Sch,Desc,SC_V, DC_V, QC_V>> {
+	static saw::error_or<void> apply(std::ostream& vtk_file, std::string_view name){
+		vtk_file<<"VECTORS "<<name<<" float\n";
+		return saw::make_void();
+	}
+};
+
 template<typename Desc, typename... StructT, saw::string_literal... StructN>
 struct lbm_vtk_writer<sch::CellField<Desc,sch::Struct<sch::Member<StructT,StructN>...>>> {
 	template<uint64_t i, uint64_t Dep>
@@ -38,6 +46,7 @@ struct lbm_vtk_writer<sch::CellField<Desc,sch::Struct<sch::Member<StructT,Struct
 		if constexpr (Dep == Desc::D){
 
 		}
+		return saw::make_void();
 	}
 
 	template<uint64_t i>
@@ -87,6 +96,7 @@ struct lbm_vtk_writer<sch::CellField<Desc,sch::Struct<sch::Member<StructT,Struct
 		auto meta = field.meta();
 		saw::data<sch::UInt64> pd_size{1u};
 		// DIMENSIONS
+
 		{
 			vtk_file << "DIMENSIONS ";
 			for(saw::data<sch::UInt64> i{0u}; i.get() < Desc::D; ++i){
diff --git a/tests/particles.cpp b/tests/particles.cpp
index 6332195..873b8ad 100644
--- a/tests/particles.cpp
+++ b/tests/particles.cpp
@@ -31,4 +31,12 @@ SAW_TEST("Minor Test for mask"){
 	//saw::data<sch::Array<sch::T,2>> reference_mask{{{4+2,4+2}}};
 	//reference_mask.at({{0,0}});
 }
+
+SAW_TEST("Verlet integration test"){
+	using namespace kel;
+	lbm::particle_system<sch::T,2,sch::Particle<sch::T,2>> system;
+
+	// system.step();
+
+}
 }
diff --git a/tests/vtk_write.cpp b/tests/vtk_write.cpp
index 0fcc169..5d61580 100644
--- a/tests/vtk_write.cpp
+++ b/tests/vtk_write.cpp
@@ -38,7 +38,7 @@ SAW_TEST("VTK Write test example"){
 
 	std::stringstream sstream;
 
-	saw::data<sch::CellField<sch::D2Q5,sch::CellStruct<sch::D2Q5>>> cells;
+	saw::data<sch::CellField<sch::D2Q5,sch::CellStruct<sch::D2Q5>>> cells{{{2u,2u}}};
 
 	auto eov = lbm::impl::lbm_vtk_writer<sch::CellField<sch::D2Q5,sch::CellStruct<sch::D2Q5>>>::apply(sstream, cells);
 	SAW_EXPECT(eov.is_value(), "vtk writer failed to write");
-- 
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