Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Wed, 3 Jun 2015 08:52:59 -0500

Hi Yves,

On 06/03/2015 08:36 AM, Yves Lussignol wrote:
> I found the following problem when compiling the gensub record module
> with EPICS base 3.15.2, but it also exists for the aSub record: the
> record field "NOT" is generated as "epicsUInt32 NOT" instead of
> "epicsUInt32 not".
> 
> typedef struct aSubRecord {
>     ...
>     epicsUInt32         nos;        /* Max. elements in S */
>     epicsUInt32         NOT;        /* Max. elements in T */
>     epicsUInt32         nou;        /* Max. elements in U */
>     ...
> } aSubRecord;

This is actually deliberate behaviour, because in C++ the lower-case
word "not" is a keyword which cannot be used as an identifier name. The
Perl scripts that convert record.dbd files into a record.h file have a
list of C and C++ keywords and other names which they do not allow to be
used as field names. If we didn't do that, EPICS users would not be able
to write aSub and genSub record subroutines in C++.

The simplest way to avoid using such a keyword is to leave the name in
upper case, hence the structure definition you quoted above.

- Andrew

-- 
Light thinks it travels faster than anything but it is wrong.
No matter how fast light travels, it finds the darkness has
always got there first, and is waiting for it.
    -- Terry Pratchett, Reaper Man

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System