c++ 是否也有class method?? - 未名空间MITBBS历史存档

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c++ 是否也有class method??

c++ 是否也有class method??# Programming - 葵花宝典

G*A2007-09-11 07:09

1 楼

即在不不实例化任何对象的情况下,仍然能够用class method 实现一些功能(输出字符
串)?
比如,在Ruby下,可以这样做:
>>class Person
>> def self.info
>> puts "Hi, Ni hao"
>> end
>>end
>>Person.info
输出:
>>Hi, Ni hao
不知道用c++可以不??谢谢回答

s*e2007-09-11 07:09

2 楼

static method.
class person{
public:
static void info() const{ std::cout<};
person::info();

【在 G****A 的大作中提到】

: 即在不不实例化任何对象的情况下,仍然能够用class method 实现一些功能(输出字符
: 串)?
: 比如,在Ruby下,可以这样做:
: >>class Person
: >> def self.info
: >> puts "Hi, Ni hao"
: >> end
: >>end
: >>Person.info
: 输出:

z*e2007-09-11 07:09

3 楼

sure.
don't have to be static. Once the method doesn't use "this", even it's null,
you can still use it.
e.g.
class A
{
public:
void output(){cout<};
...
A* a=null;
a->output();
..
it should work.

【在 G****A 的大作中提到】

X*r2007-09-11 07:09

4 楼

This is bad programming practice. Don't ever do this.

null,

【在 z***e 的大作中提到】

: sure.
: don't have to be static. Once the method doesn't use "this", even it's null,
: you can still use it.
: e.g.
: class A
: {
: public:
: void output(){cout<: };
: ...

m*t2007-09-11 07:09

5 楼

I mean I haven't done C++ for a while, but doesn't this code break any time
when A::output() is changed to either reference an instance member, or
becomes virtual? And what do we gain from doing this, exactly?
This sounds to me very much like pointing a shotgun at your own foot, rig
the trigger with some remote control, and fedex the remote control to
somebody half a globe away, with a note that says "press whenever you like".

【在 z***e 的大作中提到】

: sure.
: don't have to be static. Once the method doesn't use "this", even it's null,
: you can still use it.
: e.g.
: class A
: {
: public:
: void output(){cout<: };
: ...