Use std::invocable<T&...>

tests/zecsy.cpp

@@ -139,7 +139,7 @@ TEST_CASE("Addresses of removed components should be reused")
              * Gotta reverse it because now we reuse ids in LIFO order
              */
             std::reverse(addr.begin(), addr.end());
-            
+
             for(int j = 0; j < N; ++j)
             {
                 REQUIRE(&w.get<ChoosenOne>(entities[j]) == addr[j]);

zecsy.hpp

@@ -1,5 +1,6 @@
 #pragma once
 #include <algorithm>
+#include <concepts>
 #include <cstdint>
 #include <cstdlib>
 #include <format>
@@ -8,9 +9,7 @@
 #include <stdexcept>
 #include <type_traits>
 #include <unordered_map>
-#include <variant>
 #include <vector>
-#include <concepts>
 
 namespace zecsy
 {
@@ -22,14 +21,14 @@ namespace zecsy
     template<typename... T>
     concept Component = []
     {
-        static_assert((std::is_default_constructible_v<T> && ...), 
-                    "Should have a default constructor");
+        static_assert((std::is_default_constructible_v<T> && ...),
+                      "Should have a default constructor");
         static_assert((std::is_trivially_copyable_v<T> && ...),
-                    "Should be trivially copyable");
+                      "Should be trivially copyable");
         static_assert((std::is_trivially_destructible_v<T> && ...),
-                    "Should be trivially destructible");
-        static_assert((std::is_standard_layout_v<T> && ...), 
-                    "Should have standard layout");
+                      "Should be trivially destructible");
+        static_assert((std::is_standard_layout_v<T> && ...),
+                      "Should have standard layout");
         return true;
     }();
 
@@ -213,6 +212,7 @@ namespace zecsy
         void add_system(int freq, auto&& func);
 
         void update(float dt);
+
     private:
         struct system_handler
         {
@@ -273,7 +273,8 @@ namespace zecsy
         void remove(entity_id e);
 
         template<Component... T>
-        void query(auto&& system);
+        void query(std::invocable<T&...> auto&& system);
+
     private:
         entities_set alive_entities;
         entity_id entity_counter = 0;
@@ -328,7 +329,7 @@ namespace zecsy
     }
 
     template<Component... T>
-    inline void world::query(auto&& system)
+    inline void world::query(std::invocable<T&...> auto&& system)
     {
         for(auto e: alive_entities)
         {