基础结构而不是类 [英] Base struct instead of class
问题描述
取出C ++在一本Nutshell书中...
例7-18：使用抽象类作为接口规范。
struct Runnable {
virtual void run（）= 0;
};
struct Hashable {
virtual size_t hash（）= 0;
};
class Thread：public Runnable，public Hashable {
public：
Thread（）{start_thread（* this）; } $ / $
线程（const Runnable& thread）{start_thread（thread）; } $ / $
virtual void run（）;
virtual size_t hash（）const {return thread_id（）; }
size_t thread_id（）const;
...
private：
static void start_thread（const Runnable& ;）;
};
使用struct作为接口的优势是什么（纯虚拟
基类） ？
谢谢，马丁
Taken out of C++ In a Nutshell book...
Example 7-18: Using an abstract classes as interface specification.
struct Runnable {
virtual void run() = 0;
};
struct Hashable {
virtual size_t hash() = 0;
};
class Thread : public Runnable, public Hashable {
public:
Thread() { start_thread(*this); }
Thread(const Runnable& thread) { start_thread(thread); }
virtual void run();
virtual size_t hash() const { return thread_id(); }
size_t thread_id() const;
...
private:
static void start_thread(const Runnable&);
};
What would the advantage be of using struct as an interface (pure virtual
base class)?
Thanks,Martin
推荐答案
简洁。因此你不必输入：
class Runnable
{
public：
virtual void run（）= 0;
};
否则没有优势。我个人只在需要
来对变量进行分组时才使用struct，这样我就可以把它写成一个字节块到一个文件或者从文件中读取
。否则我会使用课程，如果打算包含
功能（例如方法）。
Tom
" ; Marcin Vorbrodt" < MV ***** @ eos.ncsu.edu>在消息中写道
news：bj ********** @ uni00nw.unity.ncsu.edu ...
brevity. Thus you don''t have to type:
class Runnable
{
public:
virtual void run() = 0;
};
Otherwise there is no advantage. Personally I use struct only when I want
to group variables so that I might write it as a block of bytes to a file or
read from a file. Otherwise I use class if the intention is to contain
functionality (e.g. methods).
Tom
"Marcin Vorbrodt" <mv*****@eos.ncsu.edu> wrote in message
news:bj**********@uni00nw.unity.ncsu.edu...
在果壳中取出C ++本书...示例7-18：使用抽象类作为接口规范。
struct Runnable {
virtual void run（）= 0;
};
struct Hashable {
virtual size_t hash（）= 0;
};
类Thread：public Runnable，public Hashable {
public：
Thread（）{start_thread（* this）;线程（const Runnable& thread）{start_thread（thread）; } void void run（）;
virtual size_t hash（）const {return thread_id（）; }
size_t thread_id（）const;
...
private：
static void start_thread（const Runnable&）;
};
使用struct作为接口（纯虚基本类）的优势是什么？
谢谢，Martin
Taken out of C++ In a Nutshell book...
Example 7-18: Using an abstract classes as interface specification.
struct Runnable {
virtual void run() = 0;
};
struct Hashable {
virtual size_t hash() = 0;
};
class Thread : public Runnable, public Hashable {
public:
Thread() { start_thread(*this); }
Thread(const Runnable& thread) { start_thread(thread); }
virtual void run();
virtual size_t hash() const { return thread_id(); }
size_t thread_id() const;
...
private:
static void start_thread(const Runnable&);
};
What would the advantage be of using struct as an interface (pure virtual
base class)?
Thanks,Martin
Thomas J. Clancy写道：
Thomas J. Clancy wrote:
简洁。因此，你不必输入：
brevity. Thus you don''t have to type:
< snip>
请不要顶一下。重新阅读常见问题解答第5部分，发布
指南。你也可以在几乎任何网络礼节中找到这个规则，包括RFC 1855.
http://www.parashift.com/c++-faq-lite/
-Kevin
-
我的电子邮件地址有效，但会定期更改。
要联系我，请使用最近发布的地址。
<snip>
Please don''t top-post. Re-read section 5 of the FAQ for posting
guidelines. You could also find this rule in pretty much any netiquette
reference, including RFC 1855.
http://www.parashift.com/c++-faq-lite/
-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.
" Kevin Goodsell" <我们********************* @ neverbox.com>在留言中写道
news：h6 *************** @ newsread4.news.pas.earthlin k.net ...
"Kevin Goodsell" <us*********************@neverbox.com> wrote in message
news:h6***************@newsread4.news.pas.earthlin k.net...
Thomas J. Clancy写道：
Thomas J. Clancy wrote:
简洁。因此，您不必输入：
brevity. Thus you don''t have to type:
< snip>
请不要顶尖。重新阅读发布
指南的常见问题解答第5部分。您也可以在任何网络礼节参考中找到此规则，包括RFC 1855.
http://www.parashift.com/c++-faq-lite/
-Kevin
<snip>
Please don''t top-post. Re-read section 5 of the FAQ for posting
guidelines. You could also find this rule in pretty much any netiquette
reference, including RFC 1855.
http://www.parashift.com/c++-faq-lite/
-Kevin
啊是的，我忘记了在大多数
新闻组中发布这个特殊的怪癖。我发现非顶级帖子令人震惊，除非我正在处理
特定的已发布问题。但是，唉，我是
少数派。尽管如此，我觉得有理由认为有人会问一个简单的问题，而不是必须向下扫描才能找到答案，如果它是在他/她的b / b $ b $ top可以立即看到答案 - 因此即时满足。
无论如何，因为它似乎让你和其他人感到愤怒，我会，对我自己感到沮丧，b $ b令人沮丧，遵守。
T. Clancy
Ah yes, I''d forgotten about this particular quirk of posting in most
newsgroups. I find non-top posting appalling unless I am addressing
specific pieces of the posted question or questions. But alas, I am in the
minority. Still, I find it logical that should someone ask one simple
question, rather than have to scan down to find the answer, if it is at the
top he/she can immediately see the answer--thus instant gratification.
Anyway, since it seems to anger you and perhaps others I will, to my own
dismay, comply.
T. Clancy
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