c++ - 我不明白的 C++ 错误：语法缺失 ';' 在标识符之前

Question

class Dialogue
{
public:
    int id;
    int trigger;
    Question descendants[5]; // Max questions per dialogue
    string text;
};

class Question
{
public:
    int id;
    int descendant;
    int ancestor;
    string text;
};

当我尝试构建它时，它会说问题后代位的以下错误？：

错误 1 ​​错误 C2146：语法错误：缺少 ';' 在标识符“后代”之前 c:\users**\documents\visual studio 2012\projects\game\game\dialogue.h 8 1 游戏错误 2 错误 C4430：缺少类型说明符 - 假定为 int。注意：C++ 不支持 default-int c:\users**\documents\visual studio 2012\projects\game\game\dialogue.h 8 1 Game

Answer 1

或者您可以转发声明您的课程。当它们都相互依赖时，这很方便：

class Question;
class Dialogue;


class Dialogue
{
public:
    int id;
    int trigger;
    Question descendants[5]; // Max questions per dialogue
    string text;
};

class Question
{
public:
    int id;
    int descendant;
    int ancestor;
    string text;
};

Answer 2

您需要切换定义，以便Question编译器在Dialogue.

这将编译：

class Question
{
public:
    int id;
    int descendant;
    int ancestor;
    string text;
};

class Dialogue
{
public:
    int id;
    int trigger;
    Question descendants[5]; // Max questions per dialogue
    string text;
};

Answer 3

类 Question 的定义应该在类 Dialogue 之后。

class Question
{
public:
    int id;
    int descendant;
    int ancestor;
    string text;
};

class Dialogue
{
public:
    int id;
    int trigger;
    Question descendants[5]; // Max questions per dialogue
    string text;
};

Answer 4

类声明的交换顺序：

class Question
{
public:
    int id;
    int descendant;
    int ancestor;
    string text;
};

class Dialogue
{
public:
    int id;
    int trigger;
    Question descendants[5]; // Max questions per dialogue
    string text;
};