3 files changed, 55 insertions, 0 deletions
diff --git a/c++/config.hpp b/c++/config.hpp
new file mode 100644
index 0000000..64f7a0f
--- /dev/null
+++ b/c++/config.hpp
@@ -0,0 +1,53 @@
+#pragma once
+
+#include <forstio/codec/data.hpp>
+#include <forstio/codec/json/json.hpp>
+
+#include <fstream>
+#include <sstream>
+#include <string_view>
+#include <string>
+
+namespace kel {
+namespace lbm {
+namespace sch {
+using namespace saw::schema;
+template<typename T, typename Desc>
+using LbmConfig = Struct<
+    Member<T, "delta_x">,
+    Member<T, "kinematic_viscosity">,
+    Member<T, "delta_t">
+>;
+}
+
+template<typename T, typename Desc>
+saw::error_or<saw::data<sch::LbmConfig<T,Desc>>> load_lbm_config(std::string_view file_name){
+    std::ifstream file{std::string{file_name}};
+
+    if(!file.is_open()){
+        return saw::make_error<saw::err::not_found>("Couldn't open file");
+    }
+
+    saw::data<sch::LbmConfig<T,Desc>, saw::encode::Json> lbm_json_conf{saw::heap<saw::array_buffer>(1u)};
+
+    uint8_t ele{};
+    while(file.readsome(reinterpret_cast<char*>(&ele), 1u) > 0u){
+        auto err = lbm_json_conf.get_buffer().push(ele,1u);
+        if(err.failed()){
+            return err;
+        }
+    }
+
+    saw::data<sch::LbmConfig<T,Desc>> lbm_conf;
+    saw::codec<sch::LbmConfig<T,Desc>, saw::encode::Json> json_codec;
+    {
+        auto eov = json_codec.decode(lbm_json_conf, lbm_conf);
+        if(eov.is_error()){
+            return std::move(eov.get_error());
+        }
+    }
+
+    return lbm_conf;
+}
+}
+}
diff --git a/c++/lbm.hpp b/c++/lbm.hpp
index 9cd7296..1baaa0e 100644
--- a/c++/lbm.hpp
+++ b/c++/lbm.hpp
@@ -2,6 +2,7 @@
 
 #include "descriptor.hpp"
 #include "converter.hpp"
+#include "config.hpp"
 
 #include <forstio/codec/unit/unit_print.hpp>
 #include <iostream>
diff --git a/c++/particle/particle.hpp b/c++/particle/particle.hpp
index 58c028c..aeda17f 100644
--- a/c++/particle/particle.hpp
+++ b/c++/particle/particle.hpp
@@ -35,6 +35,7 @@ public:
 
 	void step(T time_step){
 		for(auto& iter : particles_){
+
 		}
 	}
 };