Fixing error to create the window in a safely way

include/window.hpp

@@ -12,9 +12,18 @@ namespace data {
 }
 
 namespace gui {
+    using modulesType = std::unordered_map<std::string, data::BasicData *>;
+    class Window;
+
+    [[nodiscard]] static std::optional<Window> create_window(
+        const GLFWerrorfun errorCallback,
+        GLFWframebuffersizefun framebufferCallback,
+        const bool debugOpengl,
+        GLFWwindow *shared,
+        std::initializer_list<modulesType::value_type> initializer) noexcept;
+
     class Window final {
     public:
-        using modulesType = std::unordered_map<std::string, data::BasicData *>;
         using windowPtr = GLFWwindow *;
 
     private:
@@ -56,7 +65,7 @@ namespace gui {
             GLFWframebuffersizefun framebufferCallback,
             const bool debugOpengl,
             GLFWwindow *shared,
-            std::initializer_list<Window::modulesType::value_type> initializer) noexcept;
+            std::initializer_list<modulesType::value_type> initializer) noexcept;
 
         ~Window() noexcept;
 

src/window.cpp

@@ -116,7 +116,7 @@ namespace gui {
         const GLFWframebuffersizefun framebufferCallback,
         const bool debugOpengl,
         GLFWwindow *shared,
-        const std::initializer_list<Window::modulesType::value_type> initializer
+        const std::initializer_list<modulesType::value_type> initializer
     ) noexcept {
         if (!init) {
             glfwSetErrorCallback(errorCallback);