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，它会对问题后代的位出现以下错误吗？：

错误1错误C2146：语法错误：缺少';'在标识符之前 '后代'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 - 假设为int。注意：C ++不支持 default-int c：\ users ** \ documents \ visual studio 2012 \ projects \ game \ game \ dialogue.h 8 1游戏

Answer 1

或者您可以转发声明您的课程。当它们彼此依赖时，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，以便编译器在Question声明中使用Dialogue时知道它。

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

类问题的定义应首先进行，然后是对话类。

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

交换类声明的顺序：

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;
};

我不明白的C ++错误：语法缺失';'在标识符之前

4 个答案: