[Boost-users] [Spirit][karma] Generating Pascal string like output

Subject: [Boost-users] [Spirit][karma] Generating Pascal string like output
From: Olaf Meeuwissen (olaf.meeuwissen_at_[hidden])
Date: 2012-01-23 00:30:27

Hi all,

While I had no trouble getting the parsing part for this to work, I'm
stuck on the generator part.  Specifically, I'm stuck on getting the
size into the output.

The goal is a rule that takes a std::vector<byte> and outputs it in such
a way that it is preceded by its size (in a custom encoding) and padded
by zeroes to align on a four byte boundary.

I want to reuse this rule in several other rules and prefer to break it
up into smaller pieces.  A minimalistic example of what I have come up
with so far is attached.  What I can't seem figure out how to get at and
store the vector's size in pascal_string_size_.  There also seem to be
problems with refering to the stored size_ in pascal_string_payload_ and
pascal_string_padding_ that I don't understand.

Note that the signed/unsigned distinction is on purpose.  I am aware of
the side effects of assigning to size_ and that that is not threadsafe.

Any help would be appreciated.  Thanks in advance,
-- 
Olaf Meeuwissen, LPIC-2           FLOSS Engineer -- AVASYS CORPORATION
FSF Associate Member #1962               Help support software freedom
                 http://www.fsf.org/jf?referrer=1962