Sizeof算子的模拟 [英] Simulation of Sizeof operator
问题描述
一个人和所有人
其中一个开发人员问我你可以实现一个用户定义的功能吗?
类似于C中的sizeof操作员编程语言" ;.
是否可以在C?
在文章< 11 ** ********************@o13g2000cwo.googlegroups .com> ;,
sabarish< su ****** @ gmail.com> ;写道:其中一位开发人员问我你能实现一个用户定义的功能吗?类似于C编程语言中的sizeof操作符。
是否有可能在C?
几个星期前我们详细讨论了这个问题。
快速摘要是:不,不可移植。但你可以为
机器做这个,其中NULL指针 - 表示 - 是地址0.
-
卡尔加里大学的研究员克里斯托弗·奥尔德发现,b $ b牛奶是最理性的成瘾。在所研究的几个中。
sabarish <苏****** @ gmail.com>在消息中写道
news:11 ********************** @ o13g2000cwo.googlegr oups.com ...其中一位开发人员问我你能实现一个用户定义的功能吗?类似于C编程语言中的sizeof操作符。
是否有可能在C?
最有可能是的,但我不确定是否有任何鼻子
恶魔,可移植性问题:)。
将sizeof(type)模仿为((size_t)((type *)0 + 1))。
Alex
< blockquote>" Alexei A. Frounze" <人***** @ chat.ru>在消息中写道
news:3q ************ @ individual.net ...
" sabarish" <苏****** @ gmail.com>在消息中写道
新闻:11 ********************** @ o13g2000cwo.googlegr oups.com ...其中一位开发人员问我你能实现一个用户定义的功能吗?类似于C编程语言中的sizeof操作员。
是否有可能在C?
很可能是的,但我不确定是否有任何鼻子恶魔,可移植性问题:)。
将sizeof(type)模仿为((size_t)((类型) *)0 + 1))。
Alex
正如Walter刚才所说,如果为NULL(或0)可能会出现问题指针
不是地址0.
Alex
Hi to one and all
one of the developer asked me "Can u implement one user defined funtion
similar to the sizeof operaor in C Programming Language".
is it possible in C ?
In article <11**********************@o13g2000cwo.googlegroups .com>,
sabarish <su******@gmail.com> wrote:one of the developer asked me "Can u implement one user defined funtion
similar to the sizeof operaor in C Programming Language".
is it possible in C ?
We went over this at length just a few weeks ago.
The quick summary is: No, not portably. But you can do it for
machines in which the NULL pointer -happens- to be address 0.
--
University of Calgary researcher Christopher Auld has found that
milk is the most "rational addiction" amongst the several studied.
"sabarish" <su******@gmail.com> wrote in message
news:11**********************@o13g2000cwo.googlegr oups.com...one of the developer asked me "Can u implement one user defined funtion
similar to the sizeof operaor in C Programming Language".
is it possible in C ?
Most probably yes, but I''m not sure whether or not there are any nasal
demons, portability issues :).
Consider sizeof(type) being mimicked as ((size_t)((type*)0+1)).
Alex
"Alexei A. Frounze" <al*****@chat.ru> wrote in message
news:3q************@individual.net..."sabarish" <su******@gmail.com> wrote in message
news:11**********************@o13g2000cwo.googlegr oups.com...one of the developer asked me "Can u implement one user defined funtion
similar to the sizeof operaor in C Programming Language".
is it possible in C ?
Most probably yes, but I''m not sure whether or not there are any nasal
demons, portability issues :).
Consider sizeof(type) being mimicked as ((size_t)((type*)0+1)).
Alex
Right, as Walter just said, there can be problems if NULL (or 0) pointer
isn''t address 0.
Alex
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