size_t范围 [英] size_t range

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本文介绍了size_t范围的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

是否有标准方法来确定最大值。 size_t的值为

编译时常量?将:


#define SIZE_T_MAX((size_t)-1)


适用于所有情况,或仅适用于2s comp。机器?

DrX

Is there a standard way to determine the max. value of size_t as a
compile-time constant? Will:

#define SIZE_T_MAX ((size_t) -1)

work in all cases, or just on 2s comp. machines?
DrX

推荐答案

Xenos写道:
有没有标准的方法来确定最大size_t的值作为编译时常量?将:

#define SIZE_T_MAX((size_t)-1)

适用于所有情况,或仅适用于2s comp。机器?
Is there a standard way to determine the max. value of size_t as a
compile-time constant? Will:

#define SIZE_T_MAX ((size_t) -1)

work in all cases, or just on 2s comp. machines?




它适用于所有情况。 Casts处理值而不是表示。

对于它的价值,C99定义了一个SIZE_MAX宏,其值是size_t的最大值




Jeremy。



It will work in all cases. Casts work on values, not representations.
For what it''s worth, C99 defines a SIZE_MAX macro whose value is the
maximum value of size_t.

Jeremy.


" Xenos" <做********** @ spamhate.com>在消息中写道

新闻:c5 ********* @ cui1.lmms.lmco.com ...
"Xenos" <do**********@spamhate.com> wrote in message
news:c5*********@cui1.lmms.lmco.com...
是否有标准的方法来确定最大。 size_t的值作为编译时常量?将:

#define SIZE_T_MAX((size_t)-1)

适用于所有情况,或仅适用于2s comp。机器?
Is there a standard way to determine the max. value of size_t as a
compile-time constant? Will:

#define SIZE_T_MAX ((size_t) -1)

work in all cases, or just on 2s comp. machines?




这就是我理解它的方式。 -1,转换为无符号类型,给出

该类型的最大值,无论其代表性如何。


Peter



That''s how I understand it. -1, converted to an unsigned type, gives
the maximum value for that type regardless of representation.

Peter


2004年4月9日星期五11:17:50 -0400,Xenos < do ********** @ spamhate.com>

写道:
On Fri, 9 Apr 2004 11:17:50 -0400, "Xenos" <do**********@spamhate.com>
wrote:
是否有标准方法来确定最大值。 size_t的值作为编译时常量?将:

#define SIZE_T_MAX((size_t)-1)

适用于所有情况,或仅适用于2s comp。机器?

DrX
Is there a standard way to determine the max. value of size_t as a
compile-time constant? Will:

#define SIZE_T_MAX ((size_t) -1)

work in all cases, or just on 2s comp. machines?
DrX



size_t是某些无符号整数类型的typdef。虽然((size_t)-1)

将产生可以存储在该类型中的最大值,但是

不保证返回size_t的任何函数或运算符都将

产生的价值很大。只要满足标准中的

定义,系统就可以自由地将size_t的值限制为较小的值。


所以回答问题是你的意思是最大值是否适合

size_t变量或每个定义的任何对象的最大尺寸?

< ;<删除电子邮件的del>>


size_t is a typdef for some unsigned integer type. While ((size_t)-1)
will produce the max value that can be stored in that type, there is
no guarantee that any function or operator returning a size_t will
ever produce a value that large. The system is free to limit the
value of a size_t to a lesser value as long as it satisfies the
definition in the standard.

So the return question is do you mean the max value that will fit in a
size_t variable or the largest size of any object per the definition?
<<Remove the del for email>>


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