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问题描述
我有一个静态变量,我用作计数器和非静态版本的变量,我用来保存计数器的值在某些事件。下面是一些代码:
I have a static variable that I use as a counter and a non-static version of the variable that I use to save the value of the counter at certain events. Here is some code:
头文件:
static int UndoID;
int UndoRedoID;
void SetUnsavedChanges();
类:
我尝试这样的类:
UndoRedoID = UndoID;
我尝试过其他的操作:
UndoRedoID = myClass:UndoID;
比较示例:
void myClass::SetUnsavedChanges()
{
if (UndoRedoID != UndoID)
{
cout << "Unsaved";
}
else
{
cout << "Saved";
}
}
这导致我得到链接错误, p>
This causes me to get linking errors like:
Undefined symbols:
"myClass::UndoID", referenced from:
myClass::SetUnsavedChanges() in myClass_lib.a(myClass.o)
...
感谢您的帮助: )
推荐答案
您需要定义静态成员数据, >
You need to define the static member data, outside the class as:
//this should be done in .cpp file
int myClass::UndoID;
让我添加一个例子:
//X.h
class X
{
static int s; //declaration of static member
};
然后在 X.cpp
应该这样做:
//X.cpp
#include "X.h"
int X::s; //definition of the static member
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