Archive Magazine 1996/ARCHIVE_96.iso/text/hints/volume_09/issue_12

Text File | 1996-08-10 | 7.9 KB | 247 lines

Hints and Tips
9.12
C++ Operator Summary Ö Itæs a bit late to go with my series, but C++
programmers who read Archive will probably find this information handy.
Itæs a cut down version of the table that appears in Bjarne Stroustrupæs
ÉThe C++ Programming Languageæ (2nd Edn) 1994, Addison Wesley.
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::  scope resolution
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::  global
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.  member selection
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->  member selection
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[]  subscripting
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()  function call
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()  value construction
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++  post increment
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ÿ  post decrement
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sizeof  size of object
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sizeof  size of type
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++  pre increment
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ÿ  pre decrement
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~  complement
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!  not
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-  unary minus
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+  unary plus
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&  address of
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*  dereference
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new  create (allocate)
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delete  destroy (de-allocate)
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delete[]  destroy array
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()  cast (type conversion)
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.*  member selection
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->*  member selection
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*  multiply
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/  divide
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%  remainder
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+  add
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-  subtract
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<<  shift left
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>>  shift right
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<  less than
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>  greater than
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<=  less than or equal
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>=  greater than or equal
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==  equal
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!=  not equal
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&  bitwise AND
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^  bitwise exclusive OR
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|  bitwise inclusive OR
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&&  logical AND
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||  logical inclusive OR
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?:  conditional expression
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=  simple assignment
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*=  multiply and assign
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/=  divide and assign
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%=  modulo and assign
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+=  add and assign
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-=  subtract and assign
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<<=  shift left and assign
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>>=  shift right and assign
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&=  AND and assign
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|=  inclusive OR and assign
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^=  exclusive OR and assign
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throw  throw exception
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,  comma (sequencing)
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Each box holds operators with the same precedence and has higher
precedence than the box below.
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Unary and assignment operators are right associative.
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All other operators are left associative.
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Tony Houghton, <[e-mail]>
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Bitfolio clipart Ö The Bitfolio Edition 7 CD¡ROM, reviewed in Archive
9.6 p9, has quite rightly come in for many plaudits. The high quality of
the images and the sheer value for money, in my view, really puts all
other collections well in the shade. Some problems have come to light
but, fortunately, aásimple workround seems to apply to nearly all cases.
A few drawfiles on the CD wonæt load (a few out of 10,000? I think we
can live with that!). However, others hit problems when dropped directly
into applications such as Artworks, Impression, Ovation, etc.
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Fortunately, applying what appears to be a universal workround, is a
trivial task. Simply double-click on the drawfile icon to load the image
into Draw, call up a Save...File dialogue box and drag the Save as icon
to its destination (Artworks, Impression etc). Hey presto! Ö no Artworks
crashes, and the graphic loads into the DTP frame at exactly 100% scale;
problem solved.
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Jim Nottingham <[e-mail]>
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Cumana SCSI 2 upgrades Ö Whilst browsing on Acornæs FTP site, I
discovered two upgrades for the Cumana SCSIá2 card, versions 2.00 and
2.01. I tried version 2.00 first and then 2.01 Ö dated 7 June 96. Both
worked fine. However, when Iácame to use the SCSI manager program to
format and partition a new 650Mb Panasonic cartridge for my ProTeus
drive, I discovered, to my amazement, that I could obtain 8 (yes eight!)
partitions Ö the original SCSI4 to 7 plus SCSI0 to 3. There is no
mention of this in the read me files. I phoned Cumana support, who
confirmed that eight partitions were now available, in spite of !Help
and other documentation still insisting that, because of RISCáOS
restrictions, only four partitions out of a possible 64 can be obtained
with this card. Anyway, Iáhad a device, partitioned into eight sections,
running for several days without any problems.
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Later, however, I encountered a small problem when switching on my
machine. It started to hang, and Iáneeded to switch on and off two or
three times before I could get the !Boot running from my ADFS HardDisc4.
After a lot of trial and error, I found a small item in the Read Me file
mentioning that some SCSI hard drives did not like SCSI resets on power
up. From the SCSI manager screen, I selected the Host and then clicked
on Set Host ID. Under SCSI Reset, I changed the selected button from
Enabled to Delayed Ö problem solved.
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The upgrades can be found on the Acorn FTP site ftp://ftp.acorn.co.uk/
pub/riscos/thirdparty/cumana. Any members, who are not on the Net, can
get a copy from me at 50 Cornwall Road, Southampton, SO18 2QZ, sending a
blank formatted disc and return postage.
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Ted Lacey <[e-mail]>
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New TurboDrivers Ö Following an email exchange between James Taylor of
NCS and Kate Moir of Computer Concepts weæve acquired the following
information about the new versions of the TurboDrivers:
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New versions of Computer Conceptsæ TurboDrivers have recently been
released.
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The latest shipping version of TurboDriver (4.05) will only install to
versions 1.45, 1.52 and 1.53 of !Printers. The TurboDriver installer has
to upgrade the !RunImage file of !Printers, and Computer Concepts are
limited Ö by disc space Ö to the number of replacement !RunImages they
can offer. They decided that as versions 1.45Ö1.53 constituted the
latest versions of !Printers, it made more sense to support them and
drop support of the previous versions.
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The TurboDriver uses !Printers as a öfront endò but uses its own
rendering and queueing system. The rendering system is quite different
from the standard Acorn system, and the queueing system complements and
interacts with the Acorn system, actually improving printout times from
applications which do not use the Acorn graphics output mode (i.e. Edit,
First Word Plus, etc).
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As to a comparison of quality, Computer Concepts feel that the
TurboDriver is better, and certainly, the full control of halftone
angles, that the TurboDriver offers, provides the user with much greater
control over the output quality. However, assessing quality of output is
very subjective.
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All the TurboDrivers have been upgraded (Epson, Canon and HP). An
existing user of, say, the Canon TurboDriver can purchase the Epson and/
or HP printer engines and definition files for an additional ú11.75each
(inclusive) from Computer Concepts.
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It is possible to have two (or more) different types of TurboDriver
resident in !Printers at one time. The only requirement is that the
TurboDriver definitions be the same version, i.e. Epson TurboDriver 4.05
and Canon TurboDriver 4.05. Epson TurboDriver 4.04 will not work with
Canon TurboDriver 4.05.
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When using a non-TurboDriver printer definition files with a copy of
!Printers which has had the TurboDrivers installed into it, RISCáOS
printing is via Acorn code, and queueing via TurboDriver code.
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Recent improvements in speed and quality have been made to !Printers.
There has been speculation that !Printers has closed the gap, or even
overtaken, the TurboDrivers in terms of speed.
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Speed of output is dependent upon too many variables to quote specifics.
An additional 100Kb of free memory can make a significant difference in
the time to output.
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Computer Concepts claim that the TurboDriver is still significantly
faster than !Printers 1.53 in most areas of printing. Multiple copies of
multi-page documents will always be faster via the TurboDriver, as will
ArtWorks images and RISC OS text documents. Single bitmap (and JPEG
bitmaps) may be faster via the standard Acorn drivers.
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Alex Allen <[e-mail]>
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Upgrading PC cards Ö Readers who install 486-100 or pentium processors
may like to be warned; if you have already upgraded your software to
!PCx86, do not be tempted to skip installing this when you receive your
new processor package. There are bits and pieces in the latest version
without which you will have trouble, so install the lot (!PCx86, PCDos7
and all).
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Colin Buckland <[e-mail]>
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