Fixed for c++11

src/main.cpp

@@ -9,8 +9,8 @@ struct CleanPower
 
 struct PowerProduction
 {
-    float conventional = 0.0;
-    CleanPower renewable {0.0, 0.0}; 
+    float conventional;
+    CleanPower renewable; 
 };
 
 struct PowerUsage
@@ -83,9 +83,8 @@ constexpr float power_wind[] {
 
 int main()
 {
-    using namespace std::literals;
     spdlog::info("start");
-    std::this_thread::sleep_for(3s);
+    std::this_thread::sleep_for(std::chrono::seconds(3));
     spdlog::info("end");
     // Intialisation
     // put model into a base state