大改

csgo2/LuaBridge/luaBridge/Optional.h

@@ -0,0 +1,46 @@
+// https://github.com/vinniefalco/LuaBridge
+// Copyright 2021, Stefan Frings
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include <LuaBridge/detail/Stack.h>
+
+#include <optional>
+
+namespace luabridge {
+
+template<class T>
+struct Stack<std::optional<T>>
+{
+    static void push(lua_State* L, std::optional<T> const& optional)
+    {
+        if (optional)
+        {
+            Stack<T>::push(L, *optional);
+        }
+        else
+        {
+            lua_pushnil(L);
+        }
+    }
+
+    static std::optional<T> get(lua_State* L, int index)
+    {
+        if (lua_isnil(L, index))
+        {
+            lua_pop(L, 1);
+
+            return std::nullopt;
+        }
+
+        return Stack<T>::get(L, index);
+    }
+
+    static bool isInstance(lua_State* L, int index)
+    {
+        return lua_isnil(L, index) || Stack<T>::isInstance(L, index);
+    }
+};
+
+} // namespace luabridge