int a，int b [a] [英] int a, int b[a]

问题描述

如果我理解正确，这应该不起作用：


int a;

int b [a];


我检查的SDK文件在3或4个结构中使用它。它确实说它用B风格写的
。如果这有所不同。


这是对的吗？ < fstream.h>中的read（）函数使用未签名的

char。但是< fstream>使用char？

解决方案

Kev< di ************** @ pht.zzz>写在

新闻：Xn ********************** @ 216.168.3.44：

如果我理解正确，这应该不起作用：

int b [a];

我检查的SDK文件使用这个在3或4个结构中。它确实说它用C风格写成。如果这有所不同。

注意：看起来第一部分那些特定的结构（它在spec文件中

顺便说一句）更多他们应该包含哪些信息。与其说是如何使b $ b b使它们起作用。例如：找到a，然后使用new来创建b。

Kev schreef：

<中的read（）函数fstream.h>使用unsigned char。
但是< fstream>使用char？

fstream.h不是标准头。它可以包含任何东西。通常

编译器包含它以提供对预标准程序的支持

（即1998年之前）。由于它是预先标准的，我们不能说任何事情

对它的内容是明智的。


HTH，
Michiel Salters




Kev写道：

如果我理解正确，这应该不起作用：

int b [a];

AFAIK，这是一个内存分配错误等待发生。

我检查的SDK文件在3或4个结构中使用它。它确实说它用C风格写成。如果这有所不同。


结构本身可能会有一些更深层次的聪明，但是从

发布的代码看起来像是一个错误。 />

这是对的吗？ < fstream.h>中的read（）函数使用未签名的
字符。但是< fstream>使用char？

If I understand correctly, this should not work:

int a;
int b[a];

An SDK file I am checking out uses this in 3 or 4 structs. It does say its
written in C style. If that makes a difference.

Also is this right? The read() function in <fstream.h> uses an unsigned
char. But <fstream> uses char?

解决方案

Kev <di**************@pht.zzz> wrote in
news:Xn**********************@216.168.3.44:

If I understand correctly, this should not work:

int a;
int b[a];

An SDK file I am checking out uses this in 3 or 4 structs. It does say
its written in C style. If that makes a difference.

Note: seems for the first part those particular structs (its in a spec file
btw) are more for what information they should contain. Not so much how to
make them work. Eg: finding a, then using new to create b.

Kev schreef:

The read() function in <fstream.h> uses an unsigned char.
But <fstream> uses char?

fstream.h is not a standard header. It can contain anything. Typically
it''s included by compilers to provide support for pre-standard programs
(i.e. before 1998). Since it''s pre-standard, we can''t say anything
sensible about what''s in it.

HTH,
Michiel Salters

Kev wrote:

If I understand correctly, this should not work:

int a;
int b[a];
AFAIK, that is a memory allocation fault waiting to happen.
An SDK file I am checking out uses this in 3 or 4 structs. It does say its
written in C style. If that makes a difference.

There may be some deeper cleverness in the structs themselves, but from
the code posted it looks like an error.

Also is this right? The read() function in <fstream.h> uses an unsigned
char. But <fstream> uses char?

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