From 15a0453cf45066f3d88db783b08ce266af59230f Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sun, 20 Apr 2025 17:30:52 +0200
Subject: Add unit printing and removed type from delta type

---
 c++/converter.hpp      |  9 +++++++++
 c++/lbm.hpp            | 23 +++++++++++++++++++++++
 examples/cavity_2d.cpp | 11 ++++++++++-
 3 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 c++/lbm.hpp

diff --git a/c++/converter.hpp b/c++/converter.hpp
index 67058aa..2ad5185 100644
--- a/c++/converter.hpp
+++ b/c++/converter.hpp
@@ -20,6 +20,14 @@ public:
 		second_conv_{second_conv__}
 	{}
 
+	auto delta_x() const {
+		return meter_conv_*saw::data<sch::LbmMeter<T>>{1.0};
+	}
+
+	auto delta_t() const {
+		return second_conv_*saw::data<sch::LbmSecond<T>>{1.0};
+	}
+
 	saw::data<sch::LbmMeter<T>> meter_si_to_lbm(const saw::data<sch::SiMeter<T>>& m_si) const {
 		return m_si / meter_conv_;
 	}
@@ -40,5 +48,6 @@ public:
 		return kin_si * second_conv_ / (meter_conv_ * meter_conv_);
 	}
 };
+
 }
 }
diff --git a/c++/lbm.hpp b/c++/lbm.hpp
new file mode 100644
index 0000000..ddfa948
--- /dev/null
+++ b/c++/lbm.hpp
@@ -0,0 +1,23 @@
+#pragma once
+
+#include "descriptor.hpp"
+#include "converter.hpp"
+
+#include <forstio/codec/unit/unit_print.hpp>
+#include <iostream>
+
+namespace kel {
+namespace lbm {
+template<typename T>
+void print_lbm_meta(const converter<T>& conv){
+	std::cout
+		<<"[LBM Meta]\n"
+		<<"==========\n"
+		<<"\n"
+		<<"Δx: "<<conv.delta_x()<<"\n"
+		<<"Δt: "<<conv.delta_t()<<"\n"
+		<<""
+	;
+}
+}
+}
diff --git a/examples/cavity_2d.cpp b/examples/cavity_2d.cpp
index 55223a4..f1e2f51 100644
--- a/examples/cavity_2d.cpp
+++ b/examples/cavity_2d.cpp
@@ -1,5 +1,6 @@
 #include "../c++/descriptor.hpp"
 #include "../c++/macroscopic.hpp"
+#include "../c++/lbm.hpp"
 
 /**
  */
@@ -371,7 +372,14 @@ int main(){
 
 	saw::data<sch::CavityFieldD2Q9, saw::encode::Native> lattice{dim};
 
-	// auto& df_field = lattices.at(0).template get<"dfs">();
+	converter<sch::T> conv{
+		{0.1},
+		{0.1}
+	};
+
+	print_lbm_meta(conv);
+
+	//auto& df_field = lattices.at(0).template get<"dfs">();
 	//for(uint64_t i = 0; i < df_field.get_dim_size<0u>(); ++i){
 	//	lattices.at(i) = {dim_x, dim_y};
 	//}
@@ -380,6 +388,7 @@ int main(){
 	 * Set meta information describing what this cell is
 	 */
 	set_geometry(lattice);
+	
 	/**
 	 * 
 	 */
-- 
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