课堂设计问题。 [英] Class design question.
问题描述
这类设计是否设计不佳？
类矩形
{
双倍宽度，高度;
public：
double get_width（）const {return width; }
double get_height（）const {return height; }
void set_width（double width）{this-> width = width; }
void set_height（double height）{this-> height = height; }
};
如果是，那么为什么？
Is this class evidence of poor design?
class Rectangle
{
double width, height;
public:
double get_width() const { return width; }
double get_height() const { return height; }
void set_width(double width) { this->width = width; }
void set_height(double height) { this->height = height; }
};
If so then why?
推荐答案
* Jason Heyes：
* Jason Heyes:
这类设计是否设计不好？
类矩形
{
双倍宽度，高度;
公开：
double get_width（）const {返回宽度; }
double get_height（）const {return height; }
void set_width（double width）{this-> width = width; }
void set_height（double height）{this-> height = height; }
};
是的。
如果是，那么为什么？
Is this class evidence of poor design?
class Rectangle
{
double width, height;
public:
double get_width() const { return width; }
double get_height() const { return height; }
void set_width(double width) { this->width = width; }
void set_height(double height) { this->height = height; }
};
Yes.
If so then why?
没有用户定义constructor =>构造后的未定义状态。
和它一样（它与构造函数不同）没办法
同时分配宽度和高度。
还有证据表明编码不好，即使用不一致的
''this->'';即使在C ++中使用它通常也是糟糕的风格，但是
使用它不一致，就像消除歧义一样，更糟糕。
-
答：因为它弄乱了人们通常阅读文字的顺序。
问：为什么这么糟糕？
A：Top-发布。
问：usenet和电子邮件中最烦人的事情是什么？
No user defined constructor => undefined state after construction.
And as it stands (it would be different with a constructor) no way
to assign both width and height at the same time.
Also there is evidence of poor coding, namely inconsistent use of
''this->''; even using it at all in C++ is generally poor style, but
using it inconsistently, just as a disambiguator, is worse.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
" Jason Heyes" < JA ******** @ optusnet.com.au>在消息中写道
news：41 ********************** @ news.optusnet.com.au ...
"Jason Heyes" <ja********@optusnet.com.au> wrote in message
news:41**********************@news.optusnet.com.au ...
这类是不良设计的证据吗？
类矩形
{width double，height;
public：
double get_width（ ）const {返回宽度; }
double get_height（）const {return height; }
void set_width（double width）{this-> width = width; }
void set_height（double height）{this-> height = height; }
};
如果是，那么为什么？
Is this class evidence of poor design?
class Rectangle
{
double width, height;
public:
double get_width() const { return width; }
double get_height() const { return height; }
void set_width(double width) { this->width = width; }
void set_height(double height) { this->height = height; }
};
If so then why?
如果没有要执行的类不变量，并且没有理由
预计将来必须添加此功能，我将考虑使用普通结构：
struct Rectangle {
//考虑添加构造函数...
双倍宽度，高度;
};
-
< a rel =nofollowhref =http://ivan.vecerina.com/contact/?subject=NG_POSTtarget =_ blank> http://ivan.vecerina.com/contact/?subject=NG_POST < - 电子邮件联系表格
If there are no class invariants to enforce, and no reason
to expect having to add this capability in the future, I
would consider using a plain struct instead:
struct Rectangle {
//consider adding a constructor...
double width, height;
};
--
http://ivan.vecerina.com/contact/?subject=NG_POST <- email contact form
" Jason Heyes"写道：
"Jason Heyes" writes:
这类设计是否设计不佳？
类矩形
{
双倍宽度，高度;
public：
double get_width（）const {return width; }
double get_height（）const {return height; }
void set_width（double width）{this-> width = width; }
void set_height（double height）{this-> height = height; }
};
如果是，那么为什么？
Is this class evidence of poor design?
class Rectangle
{
double width, height;
public:
double get_width() const { return width; }
double get_height() const { return height; }
void set_width(double width) { this->width = width; }
void set_height(double height) { this->height = height; }
};
If so then why?
是的，这是糟糕的设计。这只是一种混淆的方式，用一个简单的结构来完成可能是b
。复杂性应该有一些奖励，
这里没有奖励。
Yes, it''s poor design. It is just an obfuscated way of doing what could be
done with a simple struct. There should be some reward for complexity,
there are no rewards here.
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