Function GetDelegateInfo

Plugins/UnLua/Source/UnLua/Private/LuaCore.cpp:833–859

* Get target UObject and Lua function pointer for a delegate */

 * Get target UObject and Lua function pointer for a delegate
 */
int32 GetDelegateInfo(lua_State *L, int32 Index, UObject* &Object, const void* &Function)
{
    int32 Type = lua_type(L, Index);
    if (Type != LUA_TTABLE)
    {
        return INDEX_NONE;
    }

    Object = nullptr;
    Function = nullptr;
    int32 FuncIdxInTable = INDEX_NONE;
    for (int32 i = 1; i <= 2; ++i)
    {
        Type = lua_rawgeti(L, Index, i);
        if (Type == LUA_TFUNCTION)
        {
            Function = lua_topointer(L, -1);            // Lua function pointer
            FuncIdxInTable = i;
        }
        else
        {
            Object = UnLua::GetUObject(L, -1);          // target UObject
        }
        lua_pop(L, 1);
    }
    return !Object || !Function ? INDEX_NONE : FuncIdxInTable;
}

/**
 * Get Lua instance for a UObject