C++： protect dtor - 未名空间MITBBS历史存档

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C++： protect dtor

C++： protect dtor# Programming - 葵花宝典

o*e2008-07-02 07:07

1 楼

比如学校里有一个中年女士叫Frances Hersey,估计不是博士,我跟她不是很熟,我第一
次给她发email的时候,该怎么称呼她呢?
a) Hi Frances
b) Hi Hersey
c) Hi Frances Hersey
d) Hi Mrs. Hersey
e) Dear Frances Hersey
...

c*a2008-07-02 07:07

2 楼

C++ coding standards 101:
50:
Make base class destructors public and virtual, or protected and nonvirtual
但是如果 dtor is protected, Base class can't be instantiated...
So dtor must be public and virtual..
所以我想作者是不是搞错了。。。
class A
{
protected:
~A();
}
int main()
{
A a;
A* p=new A();
return 1;
}

l*t2008-07-02 07:07

3 楼

If not sure married or not
Dear Ms Hersey,
++++++++++++++ What my ESL teacher taught me ++++++++++++++
5 Salutation (Dear...)
A letter in English almost always begins with 'Dear...', even if you do not know the person. There are several possibilities:
* Dear Mr Smith
* Dear Mrs Smith
* Dear Miss Smith
* Dear Ms Smith
* Dear Sir
* Dear Madam
* Dear Sirs
* Gentlemen

X*r2008-07-02 07:07

4 楼

Some base classes are not supposed to be instantiated at all.

nonvirtual

【在 c**a 的大作中提到】

: C++ coding standards 101:
: 50:
: Make base class destructors public and virtual, or protected and nonvirtual
: 但是如果 dtor is protected, Base class can't be instantiated...
: So dtor must be public and virtual..
: 所以我想作者是不是搞错了。。。
: class A
: {
: protected:
: ~A();

o*l2008-07-02 07:07

5 楼

Dear Frances
Dear Ms Hersey
i probably woulnd't use "Hi"

【在 o******e 的大作中提到】

: 比如学校里有一个中年女士叫Frances Hersey,估计不是博士,我跟她不是很熟,我第一
: 次给她发email的时候,该怎么称呼她呢?
: a) Hi Frances
: b) Hi Hersey
: c) Hi Frances Hersey
: d) Hi Mrs. Hersey
: e) Dear Frances Hersey
: ...