Re: port psutil on mac host_statistics get nil result
Seems like a pretty straightforward port, nothing looks wrong. What's the error value that you're seeing from the host_statistics function? Can you echo error [https://11.onl](https://11.onl)/ [https://1921681254.mx](https://1921681254.mx)/ [https://acc.onl/hotmail](https://acc.onl/hotmail)
Arrays and Sequences in nim
Ok, this is a rather newbit question but despite all my experiments I'm still confused. Let's say we want an array of int s. In Nim, I would do it either like this: var myArray: array[200, int] Run or like this: var myArray: seq[int] = newSeq[int](200) Run But what are the _real_ differences between the two options? I mean, obviously, the first one declares a fixed-size array, so if our goal is to have an array that grows and shrinks during runtime, I guess the only option would be to use a seq. But if we actually _do_ want to set an upper limit to our array? Long story short, in the stack-based bytecode VM I'm currently experimenting on I find myself using more of the first type (that is: "simple" fixed-size arrays) What are the drawbacks (memory/safety/performance-wise)? What should I pay attention to?
Re: Walking trees without recursive iterators
[Here](https://github.com/dcurrie/nim-bbtree/blob/master/src/bbtree.nim#L419-L446) is how I did it for a balanced binary tree without parent pointers, using an explicit stack as others have mentioned.
Re: Walking trees without recursive iterators
In general: All recursion can be converted to iteration. That is a foundation of the Church-Turing thesis. Also, iterators are just abstractions around loops. Simply put the yield where the body of the loop would go. @GordonBGood's algorithm is just embedded recursion using closure functions. It still builds a stack. (he mentions this in his post.) I believe you can modify that code from a binary tree to the general case fairly easily. Tree Traversal abstractly requires a way to jump back to the parent node. @mratsim does this by bit shifting, a trick he can use because of the array representation. For the representation you are using, one way to achieve this is to keep the reference to the parent. Either by building a stack, or by modifying the node object to keep an extra "parent" ref field. This obviously has some space cost. You have essentially embedded the stack into the tree itself. See here for an example in C: [https://stackoverflow.com/a/8976310](https://stackoverflow.com/a/8976310) Another option is something called "Morris Traversal": [https://www.geeksforgeeks.org/inorder-tree-traversal-without-recursion-and-without-stack](https://www.geeksforgeeks.org/inorder-tree-traversal-without-recursion-and-without-stack)/ Note that solution requires being able to modify the tree.
Re: nim android tutorial
Also see my: [https://forum.nim-lang.org/t/5197](https://forum.nim-lang.org/t/5197) And manual: [https://nim-lang.org/docs/nimc.html#cross-compilation-for-android](https://nim-lang.org/docs/nimc.html#cross-compilation-for-android)
Advanced python book with cool science excersizes
Hi there! I’m looking for a python book for my boyfriend this Christmas. He is not a beginner - he’s been working with python for a couple of years. However, he’s in science so he uses it for physics/science problems. He wants a book that’ll teach him cool python tricks - how to be more efficient with his code, with cool mini projects that are science related that he can try out. Does anyone have any Suggestions?
Re: How to store an int in a register?
Thanks a lot - I had spotted it, but not sure it was the right one for this! :)
Re: How to store an int in a register?
You can use `.codegenDecl` to do that.
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Re: nim android tutorial
this might be of help too (adapting some ideas from D to nim): [adamdruppe/d_android: Helper programs and interfaces for using D on Android systems : adamdruppe/d_android: Helper programs and interfaces for using D on Android systems]([https://github.com/adamdruppe/d_android](https://github.com/adamdruppe/d_android)) D forum [https://forum.dlang.org/thread/cqdqhrporufpzkwjw...@forum.dlang.org](https://forum.dlang.org/thread/cqdqhrporufpzkwjw...@forum.dlang.org) My Android project nearing beta
Re: How to store an int in a register?
Basically, I want to use it in one of the very very few cases where that keyword would - supposedly - make some difference: to store the top of my VM's stack.
Re: assign an object variant kind for unsafe memory block
I don't see a crash here, just a normal error message: : unhandled exception: assignment to discriminant changes object branch; compile with -d:nimOldCaseObjects for a transition period [FieldError] Run The way case objects are handled has changed. Now they can only be created with a specific case, they can't be set at runtime. You are trying to set it at run time. I can't think of other ways around this rule other then "creating and copying the object" or "using -d:nimOldCaseObjects"... There probably is but it will be just as ugly. Maybe you don't need case objects? Maybe you don't need alloc0 them? Are you using pointers because of threads?
Re: assign an object variant kind for unsafe memory block
Auxiliary copy object does not fill too bad though: type Kinds = enum kA, kB, kC ExampleBlock = object case kind: Kinds of kA: a: int of kB: b: string of kC: c: uint16 otherFields: array[16, int] when isMainModule: echo "Sizeof block, ", sizeof(ExampleBlock) # Is a union after all let kindcrash = cast[ptr ExampleBlock]( alloc0(sizeof(ExampleBlock)) ) var copyObj = ExampleBlock(kind:kb) copyObj.b = "String Test" kindcrash[] = copyObj echo kindcrash.kind echo kindcrash.b Run
Re: Introducing Synthesis: a Finite State Machine generator
Thanks @mratsim, this is really useful. > For now I don't plan to expand the library more as it is fairly complete for > my use case. The most interesting additions would be a graph backend and > maybe saving/loading state machine definitions from JSON. What does graph backend mean in this case?
Re: libgpiod wrapper uploaded to github
Nice, I like it.
Re: How to store an int in a register?
I am pretty sure you could drop into C with {.emit.} pragma and specify it this
way, but it will not make your code faster.
[https://stackoverflow.com/questions/578202/register-keyword-in-c](https://stackoverflow.com/questions/578202/register-keyword-in-c)
"It hasn't been relevant for at least 15 years as optimizers make better
decisions about this than you can."
You can't take an address of a register, or maybe you can, it will just ignore
it. It might cause errors. But it probably be mostly ignored. It's not clear...
If it did use the register it might make the code slower because then other
things can't use the register when they need it more.
If you are compiling for x86 which uses "register renaming" is a technique that
abstracts logical registers from physical registers. So you are not even doing
what you think you are doing...
[https://en.wikipedia.org/wiki/Register_renaming](https://en.wikipedia.org/wiki/Register_renaming)
How to store an int in a register?
Is there any way I can make Nim store a specific variable (uint64 to be
precise) into a specific register, for super-fast access?
Something along these lines:
register int *foo asm ("r12");
Run
Re: Any way to force a specific identifier name in C code?
Are you looking for [https://nim-lang.org/docs/manual.html#foreign-function-interface-exportc-pragma](https://nim-lang.org/docs/manual.html#foreign-function-interface-exportc-pragma)
Re: Any way to force a specific identifier name in C code?
https://nim-lang.github.io/Nim/manual.html#foreign-function-interface-exportc-pragma
Re: GDI-style lib for Nim.
Yeah, sure, awesome for 2019. So, I can set single pixel color with setPixel. Now how can I get it back ? Where is my getPixel method ?
Any way to force a specific identifier name in C code?
I know Nim creates unique identifiers for every identifier used, in the form of "MyIdentifier__BreJK2peWZ1PII7tA5raZg". Is there any way I can force a specific "unique" identifier and not have it auto-generated?
Re: GDI-style lib for Nim.
So far NiGui does not provide functions to draw multi line texts. If you want to do this, you can use splitLines() and increase y for each line by getTextLineHeight() plus maybe some line spacing. And thanks for reporting the [black shadow bug](https://github.com/trustable-code/NiGui/issues/83), it's now fixed.
libgpiod wrapper uploaded to github
I wrapped and nimified [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about/). Tested on Rpi2. I could not wrap the iterators, #define-d in C as macros... but, for me, it is not a big problem ;) [https://github.com/nais314/nimgpiod](https://github.com/nais314/nimgpiod) Happy Holidays and Happy New Year to All!
Re: A pure nim GUI game for Linux & Windows
> to sell only a few thousand copies Good joke! To sell 100 with current Nim community size may be possible, maybe 200 with a chinese translation. A free book may have indeed 1k readers. My guess is that manning sold some hundreds of NimInActions indeed, but that was when Nim was new and had some hype, in 2015. And they sold them for only 20$. Now many people know already Nim, so they may not want to buy a book. And we have a lot of free resources now.
Re: A pure nim GUI game for Linux & Windows
`shuffle()` is in-place but it did save me one line: var colors = gameColors # gameColors is a const seq[Color] shuffle(colors) colors = colors[0 ..< game.maxColors] Run It is true that NiGui uses Gtk on Linux, but Gtk is pretty well always on desktop/laptop systems even KDE ones, since there're bound to be apps that depend on it. Nim could certainly do with a really good book -- I'd certainly like to read one. (I've dipped into Nim in Action, but I felt it was too close to the docs, the main examples didn't appeal to me, and it isn't Nim 1.0.) As for writing a Nim book: (1) I'd need to have done a lot more Nim programming -- which I'm in the process of doing; (2) I'd need to have at least one core dev willing to read and give feedback on all the examples _and_ on the text -- over a 12-18 month period; (3) I'd need to interest my -- or another -- publisher; (4) I'd need to feel motivated to spend at least a year working on a book that's likely to sell only a few thousand copies and so be a labor of love rather than economically viable. So I'm hoping someone else does it:-)
Re: A pure nim GUI game for Linux & Windows
Outplace is new in devel, but I wrote "shuffle does the trick". I only used outplace in the example to generate the mutable test array from the range. And note that NiGui depends on GTK on Linux, so your earlier statement "pure Nim, no depencies" is only valid for windows. There are some GUI libs which do not need SDL or OpenGL. GTK3 needs GTK3 of course. And wNim runs on windows only. First I considered making a GTK3 version of your game, may take a few hours over Christmas. But the game idea is too boring, and I have to do really many other stuff, sorry. Are you considering writing a Nim book? Saw your Python and Go books.
Re: A pure nim GUI game for Linux & Windows
I can't find outplace (at least not in 1.0.4 or 'latest' on the Nim playground). However, I'll have another go with shuffle which I already use elsewhere. I'm sure there are other Nim libs that support NiGui's missing features -- but don't all of them depend on SDL or OpenGL or other third party libs? As for github, I have an a/c there to contribute, but I don't put my own projects there. My gravitate packages include the full source.
