> -----Original Message-----
> From: Peter Kovacs [mailto:[email protected]]
> Sent: Sunday, January 1, 2017 17:07
> To: dev <[email protected]>
> Subject: Error on enum statement. Can sombody take a little time and
> explain the enum and the error?
>
> Hello all,
>
>
> I tried to compile the source again. since I had again missing
> definition on trunc I wanted to know if I can build at least the 4.1.3
> release. I checked out the branch and started all over.
>
> And I ran into following Issue:
>
> ../inc/basebmp/packedpixeliterator.hxx:80:10: error: enumerator value
> for 'bit_mask' is not an integer constant
>
> The corresponding code is:
>
> enum {
> /** The number of pixel within a single value_type value
> */
> num_intraword_positions=sizeof(value_type)*8/bits_per_pixel,
> /** Bit mask for one pixel (least significant bits)
> */
> bit_mask=~(~0 << bits_per_pixel)
[orcmid]
Try a couple of things:
1. Put spaces in the "=~" to be something like " = ~" in the definition of
bit_mask.
2. If that makes no difference, try
bit_mask = ~ ((value_type)(~0 << bits_per_pixel))
and if that doesn't work, see if
bit_mask = ~ ((int)(~0 << bits_per_pixel))
or even
bit_mask = (int) (~(~0 << bits_per_pixel))
get the job done.
It seems strange for an enum being used this way. It is a clumsy way to define
two numeric constants that are not involved in an enumeration at all.
> };
>
>
> An explanation would be great. I found [1] on the net, but I am realy
> unsure if this is the same. And I do not understand the code in
> packedpixeliterator at all.
>
> All the best and thanks for your time.
>
> Peter
>
>
> [1]
> http://stackoverflow.com/questions/18090541/how-to-set-the-value-of-an-
> enumeration-constant-outside-the-range-of-int#18090940
>
>
>
>
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