Why don't we have different copies of static variables for the different objects?
为什么我们不为不同的对象提供不同的静态变量副本?
7 个解决方案
#1
5
Because they would be instance members then.
因为他们将成为实例成员。
The primary characteristic of static members is that they're shared by all the instances of the class.
静态成员的主要特征是它们由类的所有实例共享。
#2
5
Because the section $9.4.2/1 from the C++ Standard (2003) says,
因为C ++标准(2003)中的$ 9.4.2 / 1部分说,
A static data member is not part of the subobjects of a class. There is only one copy of a static data member shared by all the objects of the class.
静态数据成员不是类的子对象的一部分。该类的所有对象共享的静态数据成员只有一个副本。
Since the Standard alone decides what C++ is, what not, so it's how C++ has been designed!
既然标准单独决定了什么是C ++,那么C ++就是如何设计的!
Static members are more like global objects. The same copy belong to all objects!
静态成员更像是全局对象。同一副本属于所有对象!
See this post for detail answer : Do static members of a class occupy memory if no object of that class is created?
有关详细解答,请参阅此文章:如果没有创建该类的对象,则类的静态成员是否占用内存?
#3
4
A static member is not associated with a specific instance.
静态成员与特定实例无关。
If you want different values of the member for each instance you should use instance members (remove the static keyword).
如果您想为每个实例使用不同的成员值,则应使用实例成员(删除static关键字)。
#4
3
It's by definition- a static object is one that's shared by all instances of the class. Regular members don't have this property.
根据定义,静态对象是由类的所有实例共享的对象。普通会员没有这个属性。
#5
3
That is the definition of static - one copy of the data exists. It is separately stored, most likely along with all the other static data of the library or application.
这就是静态的定义 - 存在一个数据副本。它是单独存储的,很可能与库或应用程序的所有其他静态数据一起存储。
#6
1
Because that's what static means in that context.
因为这就是静态意味着在这种情况下。
#7
-1
Because class static members are stored separately in BSS section, so every instance of a class has the same value.
因为类静态成员分别存储在BSS部分中,所以类的每个实例都具有相同的值。
#1
5
Because they would be instance members then.
因为他们将成为实例成员。
The primary characteristic of static members is that they're shared by all the instances of the class.
静态成员的主要特征是它们由类的所有实例共享。
#2
5
Because the section $9.4.2/1 from the C++ Standard (2003) says,
因为C ++标准(2003)中的$ 9.4.2 / 1部分说,
A static data member is not part of the subobjects of a class. There is only one copy of a static data member shared by all the objects of the class.
静态数据成员不是类的子对象的一部分。该类的所有对象共享的静态数据成员只有一个副本。
Since the Standard alone decides what C++ is, what not, so it's how C++ has been designed!
既然标准单独决定了什么是C ++,那么C ++就是如何设计的!
Static members are more like global objects. The same copy belong to all objects!
静态成员更像是全局对象。同一副本属于所有对象!
See this post for detail answer : Do static members of a class occupy memory if no object of that class is created?
有关详细解答,请参阅此文章:如果没有创建该类的对象,则类的静态成员是否占用内存?
#3
4
A static member is not associated with a specific instance.
静态成员与特定实例无关。
If you want different values of the member for each instance you should use instance members (remove the static keyword).
如果您想为每个实例使用不同的成员值,则应使用实例成员(删除static关键字)。
#4
3
It's by definition- a static object is one that's shared by all instances of the class. Regular members don't have this property.
根据定义,静态对象是由类的所有实例共享的对象。普通会员没有这个属性。
#5
3
That is the definition of static - one copy of the data exists. It is separately stored, most likely along with all the other static data of the library or application.
这就是静态的定义 - 存在一个数据副本。它是单独存储的,很可能与库或应用程序的所有其他静态数据一起存储。
#6
1
Because that's what static means in that context.
因为这就是静态意味着在这种情况下。
#7
-1
Because class static members are stored separately in BSS section, so every instance of a class has the same value.
因为类静态成员分别存储在BSS部分中,所以类的每个实例都具有相同的值。