a c++ interview question - 未名空间MITBBS历史存档

国际科技财经博客移民网络热点娱乐民生时事公众号

Redian新闻

>未名空间

>JobHunting - 待字闺中

a c++ interview question

a c++ interview question# JobHunting - 待字闺中

w*l2009-10-08 07:10

1 楼

【以下文字转载自 Quant 讨论区】
发信人: wiseseal (wiseseal), 信区: Quant
标题: a c++ interview question
发信站: BBS 未名空间站 (Wed Oct 7 22:37:51 2009, 美东)
You have a class that many libraries depend on. Now you need to modify the c
lass for one application. Which of the following changes require recompiling
all libraries before it is safe to build the application?
a. add a constructor
b. add a data member
c. change destructor into virtual
d. add an argument with default value to an existing member function

c*r2009-10-08 07:10

2 楼

c

c
recompiling

【在 w******l 的大作中提到】

: 【以下文字转载自 Quant 讨论区】
: 发信人: wiseseal (wiseseal), 信区: Quant
: 标题: a c++ interview question
: 发信站: BBS 未名空间站 (Wed Oct 7 22:37:51 2009, 美东)
: You have a class that many libraries depend on. Now you need to modify the c
: lass for one application. Which of the following changes require recompiling
: all libraries before it is safe to build the application?
: a. add a constructor
: b. add a data member
: c. change destructor into virtual

w*l2009-10-08 07:10

3 楼

a definitely do not need, b will need,
c and d not sure...

【在 c*****r 的大作中提到】

: c
:
: c
: recompiling

S*g2009-10-08 07:10

4 楼

what if you add a constructor with parameters when the original code
does not have any constructor and relies on the default constructor
generated by the compiler?

【在 w******l 的大作中提到】

: a definitely do not need, b will need,
: c and d not sure...

w*l2009-10-08 07:10

5 楼

yes, u r right. I missed this point.
d will need as well.
c is interesting, I guess change destructor to virtual only
has an impact if the original code uses a base class pointer
to delete the derived class object. But if the original code
is like that and the destructor is not virtual, it would not be correct ?

【在 S*********g 的大作中提到】

: what if you add a constructor with parameters when the original code
: does not have any constructor and relies on the default constructor
: generated by the compiler?