Wednesday, January 21, 2009
Monday, January 19, 2009
Friday, January 16, 2009
One of the addictive things from F# is the |> operator defined by
but I've not yet found an equivalent in Scala, even though there are a ton of useful things given by the built-in APIs -- for example, I've not had to implement the usual abstraction to manage an (array, offset, length) combination, when there's Array.slice() there already.
So, just for fun...
with unit test
Refrigerator logic — I later realise that without actually adding any variance annotations the piped-to function can be one that takes any super-class of the value type. A little more thought suggests to me that type-inference does that automagically because it is able to reconcile all inputs into the types in that single expression, and will force the value to the supertype in order to make everything match up.
Thursday, January 15, 2009
Monday, January 12, 2009
Asynchronous fire-and-forget in C#3 (just skip to the last snippet).
- Teminal Services API in win2k8R2.
- Exploring USB devices.
- capturing the console to the clipboard.
- for file transfer.
- more advanced function goodness.
volatile vs volatile, and lock-free programming.
Thursday, January 08, 2009
After a dull near-freezing weekend, there was snow lying on Monday morning, in a day of sunshine and showers.
Tuesday, bright, sunny and sub-zero; so when we went on the weekly lunchtime walk, rather than staying on paved ways, we came to the bridlepath that has been too muddy all last year, and it was white with firm trodden-down snow. So we made an unexpected off-piste diversion.
Wednesday was back to about freezing, and dull, leaving lots of slush in shaded places; today, the same.
Monday, January 05, 2009
Following up to the previous post, with this script
Timestamp.fsx (unchanged by the Feb 2010 CTP, but enhanced to show the current year when it is no longer 2009):
suitably adjusted to taste in your main project folder, and a pre-build step of
cd ..\.. "C:\Program Files\FSharp-184.108.40.206\bin\fsi.exe" --exec Timestamp.fsx
or in the Feb 2010 CTP
cd ..\.. "C:\Program Files\FSharp-220.127.116.11\bin\fsi.exe" --exec Timestamp.fsx
you can get an automatically timestamped assembly, as per a C# 1.0.* version.
Note that using
[< assembly: AssemblyVersion(\"1.0.*\") >] gives an assembly version of 0.0.0.0 in the DLL manifest, and no file version whatsoever.
You will have to bootstrap the process by creating a dummy
AssemblyInfo.fs, and adding it to the project -- but of course not checking it in to source control or anything like that, since it is recreated every build.
Later: If the 4th facet exceeds 32k, it ends up set to zero, so change the factor to 3 in
let revision= ((int fraction.TotalSeconds) / 3) for those end-of-UTC-day builds...
Just a small selection from the last week or so, and not even trying to keep up with PoSh v2CTP3 goodness -- I will be so pleased when that gets to go-live state!
AssemblyInfo.fs usage for F# DLLS and console executables. Note that the ability to default build and revision numbers as in
[<assembly: AssemblyVersion("1.0.*")>] is not provided for you -- time-stamping has to be done externally e.g. by a pre-build step.
Avoiding deadlocks when redirecting stdin/out/err for spawned processes in .Net code.
Thursday, January 01, 2009
After a good week last week, Karen's MS has really bitten her these last few days, both physically and mentally. On the bright side, it is the first real attack, rather than just slow progression, for a long while. Still, it looks like I'm going to have to pretty much everything about the house and more body-servant work while getting some formal assistance involved.
All this and work too, tomorrow.
Film : apart from the handful at the Film Festival, cinema seemed to be either the standard extruded product from the bowels of Hollywood, or English-miserablist. The only one I saw was when taking Karen to see Georgiana, and that I didn't rate.
Books : almost everything I read was software related -- for SF, see above about extruded product. My recommendation on the software front would be F# for Scientists, which did the basic teaching necessary to make the other books (Foundations of..., Expert...) somewhat more comprehensible. Foundations in particular is a poor introductory text as it hides the descriptions of syntax (as opposed to accidents of the examples) in solid paragraphs of text -- you need to have grasped the language before you can really get to grips with the book.
Anime : the year when Aniplex hired an outfit to send out DMCA notifications, where fansubs were slow, but some titles were for the first time officially simulsubbed or nearly so (of which only Strike Witches took my fancy). A fair number of OK-to-good series from the middle of the year, but nothing as outstanding as '07.
No real highlight, unless Mouryou no Hako delivers as it has begun, and only one that was so bad that I regretted having watched the one episode (Mnemosyne); though quite a lot that failed out of boredom (Spice & Wolf, Shigofumi Telepathy Girl Ran).
Other titles get separate mentions earlier, or get covered in spring and summer round-ups.
Following up from here.
Units of measure are indeed useful, especially once one has twigged that the syntax needed to generalize over the units involved is like
and that you need to go the F# built-in math functions to have ones that are themselves so generalised.
So, here is the
mostly essentially finished example applet (still needs to compute and draw the moon phases) with source bundled into the .xap file