指向不透明对象的指针大小 [英] Size of pointer to opaque object

问题描述

``表示对象ID的不透明指针。

struct _objID;

typedef struct _objID * objectID;''''


你好。我使用定义了objectID类型的api。上面的

表示文档上的

范围。


以上意味着objectID被定义为指向尚未定义

class / struct _objID，并且，如果我理解正确的术语，则

是不透明的，只要_objID类/结构的实际性质是还不知道，

是啊？


我的问题是我需要静态地确定objectID的大小。我现在需要
占用与1,2,3 ...字符相同的空间，但不使用sizeof（objectID）

。可能吗？我当时认为它可能会像char *一样大小或类似的东西。


TIA

``Opaque-pointer representing the ID of an object.
struct _objID;
typedef struct _objID * objectID;''''

Hi again. Im using an api that defines an objectID type. The above
represents the
extent of the documentation on it.

The above means that objectID is defined as a pointer to an as yet undefined
class/struct _objID, and, if I understand the term correctly, is opaque in
so far as the actual nature of the _objID class/struct is as yet unknown,
yeah?

My problem is that I need to statically determine the size of an objectID. I
need to now that it occupies the same amount of space as 1,2,3... chars, but
without using sizeof(objectID). Is it possible? I was thinking that it might
be the same size as char* or something convenient like that.

TIA

推荐答案

" Ellarco" <无**** @ eircom.net>写道...

"Ellarco" <no****@eircom.net> wrote...

``表示对象ID的不透明指针。
struct _objID;
typedef struct _objID * objectID;''''
<再次嗨。我使用定义了objectID类型的api。上面的
表示文档的大小。

上面的意思是objectID被定义为一个指向尚未定义的
未定义的类/结构_objID的指针，如果我理解这个术语，那么_bjID类/结构的实际性质尚未知，是不透明的
，是吗？

我的问题是我需要静态确定objectID的大小。
我现在需要占用与1,2,3 ... chars，
相同的空间，但不使用sizeof（objectID）。可能吗？我以为
可能与char *的大小相同或类似的东西。

``Opaque-pointer representing the ID of an object.
struct _objID;
typedef struct _objID * objectID;''''

Hi again. Im using an api that defines an objectID type. The above
represents the
extent of the documentation on it.

The above means that objectID is defined as a pointer to an as yet undefined class/struct _objID, and, if I understand the term correctly, is opaque in so far as the actual nature of the _objID class/struct is as yet unknown,
yeah?

My problem is that I need to statically determine the size of an objectID. I need to now that it occupies the same amount of space as 1,2,3... chars, but without using sizeof(objectID). Is it possible? I was thinking that it might be the same size as char* or something convenient like that.

指向任何对象的指针的大小是相同的并且与

a指向void相同。因此，您可以将sizeof（void *）用于您的目的。


Victor

The size of a pointer to any object is the same and is the same as
a pointer to void. So, you may use sizeof(void*) for your purposes.

Victor

Ellarco写道：

....

Ellarco wrote:
....

我的问题是我需要静态地确定objectID的大小。我现在需要占用与1,2,3 ...字符相同的空间，但不使用sizeof（objectID）。可能吗？我当时认为它可能和char *一样大小或类似的东西。

My problem is that I need to statically determine the size of an objectID. I
need to now that it occupies the same amount of space as 1,2,3... chars, but
without using sizeof(objectID). Is it possible? I was thinking that it might
be the same size as char* or something convenient like that.

什么阻止你使用sizeof（objectID）？

What is stopping you from using sizeof(objectID) ?

Victor Bazarov写道：

[...]

Victor Bazarov wrote:
[...]

我的问题是我需要静态地确定objectID的大小。我现在需要占用与1,2,3 ...字符相同的空间，但不使用sizeof（objectID）。可能吗？


是的。使用sizeof（_objID *）。

我当时认为它可能与char *的大小相同或类似的方便。

My problem is that I need to statically determine the size of an objectID. I
need to now that it occupies the same amount of space as 1,2,3... chars, but
without using sizeof(objectID). Is it possible?
Yes. Use sizeof(_objID *).
I was thinking that it might
be the same size as char* or something convenient like that.

指向任何对象的指针的大小是相同的，并且与指向void的指针相同。

The size of a pointer to any object is the same and is the same as
a pointer to void.

更改诊所，Bazarov。


问候，

亚历山大。

Change the clinic, Bazarov.

regards,
alexander.

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