类与结构？ [英] Classes vs Structs?
问题描述
Google上有很多关于此主题的信息。但在Bjarne Stroustrup
的书页225中，他写道：
前一小节中的日期声明（声明为
struct）提供了一组用于操作Date的函数。但是，
没有指定那些函数应该是唯一直接依赖于Date？s表示的
和唯一直接访问的函数
类Date的对象。这个限制
可以通过使用类而不是结构来表示
但是我不明白为什么你需要一个类，第234页他甚至显示
您可以在结构中拥有私有和公共字段和函数
。他写的这本书中是否有错误，你需要一个班级才能使数据私密化？
There is a lot of info on this topic on google. But in Bjarne Stroustrup
''s book page 225 he writes:
"The declaration of Date in the previous subsection (declared as a
struct) provides a set of functions for manipulating a Date. However, it
does not specify that those functions should be the only ones to depend
directly on Date ?s representation and the only ones to directly access
objects of class Date . This restriction
can be expressed by using a class instead of a struct"
But I don''t see why you need a class for this, on page 234 he even shows
that you can have private and public fields and functions in a struct
also. Is it an error in the book that he writes that you need a class to
make data private?
推荐答案
桌面写道：
desktop wrote:
谷歌上有很多关于这个主题的信息。但在Bjarne Stroustrup
的书页225中，他写道：
前一小节中的日期声明（声明为
struct）提供了一组用于操作Date的函数。但是，
没有指定那些函数应该是唯一直接依赖于Date？s表示的
和唯一直接访问的函数
类Date的对象。这个限制
可以通过使用类而不是结构来表示
但是我不明白为什么你需要一个类，第234页他甚至显示了
你可以在一个结构中拥有私有和公共字段和函数
。书中是否有错误，他写道你需要一个班级才能使数据私有化？
There is a lot of info on this topic on google. But in Bjarne Stroustrup
''s book page 225 he writes:
"The declaration of Date in the previous subsection (declared as a
struct) provides a set of functions for manipulating a Date. However, it
does not specify that those functions should be the only ones to depend
directly on Date ?s representation and the only ones to directly access
objects of class Date . This restriction
can be expressed by using a class instead of a struct"
But I don''t see why you need a class for this, on page 234 he even shows
that you can have private and public fields and functions in a struct
also. Is it an error in the book that he writes that you need a class to
make data private?
不，这不是错误。 Stroustrup并没有说你需要创造一个班级的b $ b。他说你可以解决创建课程的问题。
实际上，你可以解决它，并在
结构中声明成员私有。无论如何，它已经被弃用了struct关键字。阅读
http ：//www.parashift.com/c++-faq-lit...s.html#faq-7.8
问候，
Zeppe
no, it''s not an error. Stroustrup doesn''t say that you _need_ to create
a class. He says that you can solve that problem creating a class.
Actually, you can solve it also declaring the members private in a
struct. It''s deprecated, anyway, such a use of the struct keyword. Read
http://www.parashift.com/c++-faq-lit...s.html#faq-7.8
Regards,
Zeppe
6月7日下午1:55，Zeppe
< zep_p @ .remove.all.this.long .comment.yahoo.itwrote：
On Jun 7, 1:55 pm, Zeppe
<zep_p@.remove.all.this.long.comment.yahoo.itwrote :
desktop写道：
desktop wrote:
这方面有很多信息关于谷歌的话题。但是在Bjarne Stroustrup
的书页225中，他写道：
There is a lot of info on this topic on google. But in Bjarne Stroustrup
''s book page 225 he writes:
之前的日期声明subsection（声明为
struct）提供了一组用于操作Date的函数。但是，
并没有指定那些函数应该是唯一直接依赖于Date表示的函数和唯一直接访问的函数
类Date的对象。这个限制
可以通过使用类而不是结构来表示。
"The declaration of Date in the previous subsection (declared as a
struct) provides a set of functions for manipulating a Date. However, it
does not specify that those functions should be the only ones to depend
directly on Date ''s representation and the only ones to directly access
objects of class Date . This restriction
can be expressed by using a class instead of a struct"
但我不明白为什么你需要上课，第234页他甚至表示
你可以在一个结构中拥有私有和公共字段和函数
。书中是否有错误，他写道你需要一个班级才能使数据私有化？
But I don''t see why you need a class for this, on page 234 he even shows
that you can have private and public fields and functions in a struct
also. Is it an error in the book that he writes that you need a class to
make data private?
不，这不是错误。 Stroustrup并没有说你需要创造一个班级的b $ b。他说你可以解决创建课程的问题。
实际上，你可以解决它，并在
结构中声明成员私有。无论如何，它已经被弃用了struct关键字。 Readhttp：//www.parashift.com/c++-faq-lite/classes-and-objects.html#faq-7.8
问候，
Zeppe
no, it''s not an error. Stroustrup doesn''t say that you _need_ to create
a class. He says that you can solve that problem creating a class.
Actually, you can solve it also declaring the members private in a
struct. It''s deprecated, anyway, such a use of the struct keyword. Readhttp://www.parashift.com/c++-faq-lite/classes-and-objects.html#faq-7.8
Regards,
Zeppe
编码时你必须自己决定。
现在如果你想让你编码C ++但你想使用struct
，它取决于struct的限制。如果有什么东西
结构不能处理，那么你必须使用类。
阅读： http://carcino.gen.nz/tech/cpp/struct_vs_class.php
问候，
有些事情已知且事情未知，介于两者之间。
There are certain things you got to decide by yourself while coding.
Now if you want to have you code in C++ but you want to use struct
that will depend upon the limits of struct. If there is something
struct can''t handle then you got to use class.
Read this : http://carcino.gen.nz/tech/cpp/struct_vs_class.php
Regards,
ar
"There are things known and things unknown, in between are The Doors."
6月7日，11：05，Anonymous< ashwani.ra ... @ gmail.comwrote：
On 7 Jun, 11:05, Anonymous <ashwani.ra...@gmail.comwrote:
在编码时你必须自己决定某些事情。
现在如果你想用C ++编写代码但是你想使用struct
这将取决于结构的限制。如果有什么东西
struct无法处理，那么你必须使用类。
There are certain things you got to decide by yourself while coding.
Now if you want to have you code in C++ but you want to use struct
that will depend upon the limits of struct. If there is something
struct can''t handle then you got to use class.
您认为struct有什么限制？你怎么认为struct不能用b $ b来处理那个类呢？
What limits do you think struct has? What do you think struct can''t
handle that class can?
读这个： http://carcino.gen.nz/tech/cpp/struct_vs_class.php
该链接描述了结构和类的近似等价（尽管
在谈到成员时应该谈论成员和基类 -
见FAQ 7.8）并没有提到任何限制。或任何struct can''t
句柄。它似乎与你上面说的相矛盾。
Gavin Deane
That link describes the near-equivalence of struct and class (although
where it talks of members it should talk of members and base classes -
see FAQ 7.8) and doesn''t mention any "limit" or anything "struct can''t
handle". It appears to contradict what you say above.
Gavin Deane
这篇关于类与结构？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
