name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <iostream.h>
class SomeClass
{
public:
SomeClass(int value) { count++; my_data = value; };
SomeClass(int value, int static_value)
{
count = static_value; my_data = value;
};
~SomeClass(void) { count--; };
void show_values(void) { cout << my_data << ' ' << count << endl; };
private:
static int count;
int my_data;
};
int SomeClass::count;
void main(void)
{
SomeClass One(1, 999);
One.show_values();
// Declare another instance
SomeClass Two(2, 1000);
Two.show_values();
// Declare another instance
SomeClass Three(3);
Three.show_values();
}
本文通过一个C++程序示例介绍了如何使用静态成员变量来跟踪类实例的数量。示例中定义了一个名为SomeClass的类,该类包含一个静态成员变量count用于记录创建的对象数目。文中展示了如何在构造函数和析构函数中更新count,并在成员函数中显示当前对象的数据成员和静态成员变量的值。
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