1 files changed, 15 insertions, 0 deletions
diff --git a/src/platform/gui/UiApplication.cpp b/src/platform/gui/UiApplication.cpp
new file mode 100644
index 00000000..f095361e
--- /dev/null
+++ b/src/platform/gui/UiApplication.cpp
@@ -0,0 +1,15 @@
+#include "cru/platform/gui/UiApplication.hpp"
+
+namespace cru::platform::gui {
+IUiApplication* IUiApplication::instance = nullptr;
+
+IUiApplication::IUiApplication() {
+  if (instance) {
+    throw std::runtime_error("An ui application has already been created.");
+  }
+  
+  instance = this;
+}
+
+IUiApplication::~IUiApplication() { instance = nullptr; }
+}  // namespace cru::platform::gui