Question

我在使用此代码时遇到错误：

void Game::changeState(gameState type) // gameState is an enum
{
   if (!states.empty()) // deleting the last state
   {
       states.back()->clean();
       states.pop_back();
   }

   switch(type)
   {
       case editorState:
       {
           states.push_back(std::move(std::unique_ptr<EditorState> (new EditorState)));
           states.back()->init();
           break;
       }
       case menuState:
       {
           states.push_back(std::move(std::unique_ptr<MenuState> (new MenuState)));
           states.back()->init();
           break;
       }

   }
}

载体：

std::vector<std::unique_ptr<GameState>> states;

错误消息：

c：\ program files（x86）\ codeblocks \ mingw \ bin .. \ lib \ gcc \ mingw32 \ 4.7.1 \ include \ c ++ \ bits \ unique_ptr.h || 实例化'void std :: default_delete＆lt; _Tp＆gt; :: operator（）（_ Tp *）const [with _Tp = GameState]'：| c：\ program files（x86）\ codeblocks \ mingw \ bin .. \ lib \ gcc \ mingw32 \ 4.7.1 \ include \ c ++ \ bits \ unique_ptr.h | 245 | 需要'void std :: unique_ptr＆lt ; _Tp，_Dp＆gt; :: reset（std :: unique_ptr＆lt; _Tp，_Dp＆gt; :: pointer）[with _Tp = GameState; _Dp = std :: default_delete; std :: unique_ptr＆lt; _Tp，_Dp＆gt; :: pointer = GameState *]'| c：\ program files（x86）\ codeblocks \ mingw \ bin .. \ lib \ gcc \ mingw32 \ 4.7.1 \ include \ c ++ \ bits \ unique_ptr.h | 169 | 需要'std :: unique_ptr＆lt; _Tp，_Dp＆gt; ::〜unique_ptr（）[with _Tp = GameState; _Dp = std :: default_delete]'| c：\ program files（x86）\ codeblocks \ mingw \ bin .. \ lib \ gcc \ mingw32 \ 4.7.1 \ include \ c ++ \ bits \ stl_construct.h | 95 | 需要'void std :: _ Destroy （_Tp *）[with _Tp = std :: unique_ptr]'| c：\ program files（x86）\ codeblocks \ mingw \ bin .. \ lib \ gcc \ mingw32 \ 4.7.1 \ include \ c ++ \ bits \ stl_construct.h | 105 | 'static void std :: _Destroy_aux＆LT; ＆gt; :: __ destroy（_ForwardIterator，_ForwardIterator）[with _ForwardIterator = std :: unique_ptr *; bool = false]'| c：\ program files（x86）\ codeblocks \ mingw \ bin .. \ lib \ gcc \ mingw32 \ 4.7.1 \ include \ c ++ \ bits \ stl_construct.h | 128 | 需要'void std :: _ Destroy （_ForwardIterator，_ForwardIterator）[with _ForwardIterator = std :: unique_ptr *]'| c：\ program files（x86）\ codeblocks \ mingw \ bin .. \ lib \ gcc \ mingw32 \ 4.7.1 \ include \ c ++ \ bits \ stl_construct.h | 155 | 需要'void std :: _ Destroy （_ForwardIterator，_ForwardIterator，std :: allocator＆lt; _T2＆gt;＆amp;）[with _ForwardIterator = std :: unique_ptr *; _Tp = std :: unique_ptr]'| c：\ program files（x86）\ codeblocks \ mingw \ bin .. \ lib \ gcc \ mingw32 \ 4.7.1 \ include \ c ++ \ bits \ stl_vector.h | 403 | 需要'std :: vector＆lt; _Tp，_Alloc＆gt; ::〜vector（）[with _Tp = std :: unique_ptr; _Alloc = std :: allocator＆gt;]'| ... \ game.h | 15 | 从这里开始| c：\ program files（x86）\ codeblocks \ mingw \ bin .. \ lib \ gcc \ mingw32 \ 4.7.1 \ include \ c ++ \ bits \ unique_ptr.h | 63 | 错误：'sizeof'的应用无效到不完整类型'GameState'| || ===构建完成：1个错误，12个警告（0分钟，1秒）=== |

当我使用默认指针时，上面的代码有效，但是当我使用unique_ptr时，它会给我上面的错误......

编辑：以下是game.h：http://pastebin.com/DiBbXrC6 和游戏状态：http://pastebin.com/JD3VrktJ

Answer 1

使用unique_ptr时，您需要明确定义类T，并声明unique_ptr<T>。即包括class GameState的标头，请勿在标头game.h中转发声明。

这将摆脱error: invalid application of 'sizeof' to incomplete type 'GameState'。

您可以找到更详细的答案here。

无法push_back向量中的unique_ptr

1 个答案: