Re: AW: [lwip-users] ioctl() plus compiler warnings/errors

[leon . woestenberg]

Hello Florian,

> They are, but that doesn't help in this case. It's probably a compiler
> error, not to cut the constant to the correct length of the variable if
> possible.

> #define TF_FOO 0x2U
> char c;

> This works:
> c = TF_FOO;

> This doesn't:
> c = ~TF_FOO
>
But what if you define 'c' as being a 'unsigned char'? If you are using it
as a set of flags, this should really work.

Leon.



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|         |           "Zschocke, Florian" <address@hidden>  |
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|         |           17-02-2003 16:47                           |
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  |       Subject:  AW: [lwip-users] ioctl() plus compiler warnings/errors      
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address@hidden wrote on Montag, 17. Februar 2003 16:36:

> Hello,
>
> I think the preferable method is to define the constants with a
> U suffix (unsigned).

They are, but that doesn't help in this case. It's probably a compiler
error, not to cut the constant to the correct length of the variable if
possible.

#define TF_FOO 0x2U
char c;

This works:
c = TF_FOO;

This doesn't:
c = ~TF_FOO

This does:

c = (char)~TF_FOO

Florian.


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