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  • Function templates for arbitrary STL containers containing arbitrary types.

    - by Chad Brewbaker
    I have an arbitrary STL container C, which contains elements of an arbitrary type T. I want to create an std::vector that has a copy of all the elements. What is the cleanest way to do this? template <typename C> void myfunction(C container){ /*Derive the type T of elements within the container*/ std::vector<T> mystack; /* Iterate over container and push_back() the elements into mystack*/ }

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  • c++ floating point precision loss: 3015/0.00025298219406977296

    - by SigTerm
    The problem. Microsoft Visual C++ 2005 compiler, 32bit windows xp sp3, amd 64 x2 cpu. Code: double a = 3015.0; double b = 0.00025298219406977296; //*((unsigned __int64*)(&a)) == 0x40a78e0000000000 //*((unsigned __int64*)(&b)) == 0x3f30945640000000 double f = a/b;//3015/0.00025298219406977296; the result of calculation (i.e. "f") is 11917835.000000000 (*((unsigned __int64*)(&f)) == 0x4166bb4160000000) although it should be 11917834.814763514 (i.e. *((unsigned __int64*)(&f)) == 0x4166bb415a128aef). I.e. fractional part is lost. Unfortunately, I need fractional part to be correct. Questions: 1) Why does this happen? 2) How can I fix the problem? Additional info: 0) The result is taken directly from "watch" window (it wasn't printed, and I didn't forget to set printing precision). I also provided hex dump of floating point variable, so I'm absolutely sure about calculation result. 1) The disassembly of f = a/b is: fld qword ptr [a] fdiv qword ptr [b] fstp qword ptr [f] 2) f = 3015/0.00025298219406977296; yields correct result (f == 11917834.814763514 , *((unsigned __int64*)(&f)) == 0x4166bb415a128aef ), but it looks like in this case result is simply calculated during compile-time: fld qword ptr [__real@4166bb415a128aef (828EA0h)] fstp qword ptr [f] So, how can I fix this problem? P.S. I've found a temporary workaround (i need only fractional part of division, so I simply use f = fmod(a/b)/b at the moment), but I still would like to know how to fix this problem properly - double precision is supposed to be 16 decimal digits, so such calculation isn't supposed to cause problems.

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  • Why don't computers store decimal numbers as a second whole number?

    - by SomeKittens
    Computers have trouble storing fractional numbers where the denominator is something other than a solution to 2^x. This is because the first digit after the decimal is worth 1/2, the second 1/4 (or 1/(2^1) and 1/(2^2)) etc. Why deal with all sorts of rounding errors when the computer could have just stored the decimal part of the number as another whole number (which is therefore accurate?) The only thing I can think of is dealing with repeating decimals (in base 10), but there could have been an edge solution to that (like we currently have with infinity).

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  • Handling extremely large numbers in a language which can't?

    - by Mallow
    I'm trying to think about how I would go about doing calculations on extremely large numbers (to infinitum - intergers no floats) if the language construct is incapable of handling numbers larger than a certain value. I am sure I am not the first nor the last to ask this question but the search terms I am using aren't giving me an algorithm to handle those situations. Rather most suggestions offer a language change or variable change, or talk about things that seem irrelevant to my search. So I need a little guideance. I would sketch out an algorithm like this: Determine the max length of the integer variable for the language. If a number is more than half the length of the max length of the variable split it in an array. (give a little play room) Array order [0] = the numbers most to the right [n-max] = numbers most to the left Ex. Num: 29392023 Array[0]:23, Array[1]: 20, array[2]: 39, array[3]:29 Since I established half the length of the variable as the mark off point I can then calculate the ones, tenths, hundredths, etc. Place via the halfway mark so that if a variable max length was 10 digits from 0 to 9999999999 then I know that by halfing that to five digits give me some play room. So if I add or multiply I can have a variable checker function that see that the sixth digit (from the right) of array[0] is the same place as the first digit (from the right) of array[1]. Dividing and subtracting have their own issues which I haven't thought about yet. I would like to know about the best implementations of supporting larger numbers than the program can.

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  • Recommendation for Ethernet switches that allow arbitrary network topologies

    - by sblair
    We have the following requirements for three Ethernet switches that will be connected together: Allow the switches to connect together to form dynamic, arbitrary topologies, i.e., support for the RSTP is essential. Allow the physical topology (which ports are connected together) to be gleaned from the switches, e.g., using SNMP traps. This is optional, but would be very useful. At least 5 ports on each switch, but only 3 will be used for connecting the switches together. Be as compact as possible. Ideally be in stock, in the UK. Only 100Mb/s is required. (This question is the result of the lack of RSTP support from 3Com NJ225 devices, as described in my previous question.)

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  • Arbitrary Key Remapping on a Mac

    - by Mason
    I bought a cheap Chinese replacement keyboard for my late 2007 MBP. The close square/curly bracket key actually sends a left control signal to the Mac. So I'm trying to remap my backslash/pipe key to be close square/curly bracket but I can't find the key remapping software to do it. Double Command and KeyRemap4Macbook can't do arbitrary key remaps and uControl/fkeys don't work on Snow Leopard. Anyone have ideas? I have no problem editing text config files if necessary.

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  • Split time in arbitrary periods, EXCEL

    - by Gabriel A. Zorrilla
    I have a list with date and quantity of items used IE: 2009.03.18 -1 2009.06.05 -2 2009.06.22 -1 2009.06.29 -2 2009.07.14 -1 2009.07.14 -1 2009.07.14 -2 2009.07.20 -2 2009.07.30 -1 2009.07.30 -1 2009.08.06 -1 2009.08.26 -1 2009.09.15 -1 2009.09.16 -2 2009.09.22 -2 2009.09.23 -2 2009.09.30 -2 2009.10.07 -1 2009.10.08 -2 2009.10.22 -1 2009.11.06 -3 2009.11.17 -2 2009.11.20 -1 2009.11.23 -2 2009.11.23 -1 2009.11.25 -2 2009.11.27 -1 2009.12.02 -2 I need to know how much items i consumed in a determined period, ie, 15 days. I can do it in a monthly basis, basically using the month function to extract the month and work from there, but with an arbitrary time (which is the average lead time from my supplier) dont know how to get a function to split the date list in chunks of 15 (or whatever) days. Any tips? Thanks!

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  • Windows Software to Save Arbitrary Application State

    - by ashes999
    VM software does a great job of saving state when you "turn it off," allowing instant and immediate return to that previous state. Is there some application for Windows that allows me to do the same thing, for any arbitrary software? It would allow me to save/restore state, possibly via a shell command or button that it appends to every window. Edit: For clarity, there are two types of apps: those that save their own states, and those that save others' states. Those that save their own state are like Chrome, which on load, reloads the windows you had open last time. That's not what I'm asking about; I'm asking for an app that can save the state of other apps, kind of like VM software does; but for any app. (A trivial test would be load notepad++, type a bunch of stuff, and save-state; on reset-state, you should be able to multi-level undo a lot of what you wrote, as if you never shut down the application.)

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  • Windows Software to Save Arbitrary Application State

    - by ashes999
    VM software does a great job of saving state when you "turn it off," allowing instant and immediate return to that previous state. Is there some application for Windows that allows me to do the same thing, for any arbitrary software? It would allow me to save/restore state, possibly via a shell command or button that it appends to every window. Edit: For clarity, there are two types of apps: those that save their own states, and those that save others' states. Those that save their own state are like Chrome, which on load, reloads the windows you had open last time. That's not what I'm asking about; I'm asking for an app that can save the state of other apps, kind of like VM software does; but for any app. (A trivial test would be load notepad++, type a bunch of stuff, and save-state; on reset-state, you should be able to multi-level undo a lot of what you wrote, as if you never shut down the application.)

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  • Problem installing iATKOS S3 Version 2 Snow Leopard 10.6.3 on DELL Precision T5500 Desktop

    - by Matias Dominoni
    Someone managed to install this right? I've used the following parameters: -v -x -f cpus=1 busratio=22 After installation, boot fails with a Kernel Panic. The exact error here: http://www.insanelymac.com/forum/index.php?showtopic=182609&mode=linearplus I'm aware that is very annoying installation. http://www.insanelymac.com/forum/index.php?showtopic=222386 Does anyone knows a guide to follow up or any other distrubution that works?

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  • Dell Precision 670 no booting

    - by fristson
    Our dell running xp did not boot one day and was making a beep code I had a hard time finding on the internet. It was one of the RAM sticks so i replaced it. Before that i removed the motherboard battery to see if there was a problem with the battery. Now at start up it tells me that No Logical Drives Found and then BIOS not installed!. I have read over alot of post here and other places but everyone is talking about installation of the OS. I just want it to start with what it had. Please help.

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  • Create an anonymous type object from an arbitrary text file

    - by Robert Harvey
    I need a sensible way to draw arbitrary text files into a C# program, and produce an arbitrary anonymous type object, or perhaps a composite dictionary of some sort. I have a representative text file that looks like this: adapter 1: LPe11002 Factory IEEE: 10000000 C97A83FC Non-Volatile WWPN: 10000000 C93D6A8A , WWNN: 20000000 C93D6A8A adapter 2: LPe11002 Factory IEEE: 10000000 C97A83FD Non-Volatile WWPN: 10000000 C93D6A8B , WWNN: 20000000 C93D6A8B Is there a way to get this information into an anonymous type object or some similar structure? The final anonymous type might look something like this, if it were composed in C# by hand: new { adapter1 = new { FactoryIEEE = "10000000 C97A83FC", Non-VolatileWWPN = "10000000 C93D6A8A", WWNN = "20000000 C93D6A8A" } adapter2 = new { FactoryIEEE = "10000000 C97A83FD", Non-VolatileWWPN = "10000000 C93D6A8B", WWNN = "20000000 C93D6A8B" } } Note that, as the text file's content is arbitrary (i.e. the keys could be anything), a specialized solution (e.g. that looks for names like "FactoryIEEE") won't work. However, the structure of the file will always be the same (i.e. indentation for groups, colons and commas as delimiters, etc). Or maybe I'm going about this the wrong way, and you have a better idea?

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  • Change the precision of all decimal columns in every table in the database

    - by Jon
    Hi all, I have a rather large database that has alot of decimal columns in alot of tables, the customer has now changed their mind and wants all the numbers (decimals) to have a precision of 3 d.p. instead of the original two. Is there any quick way of going through all the tables in a database and changing any decimal column in that table to have 3.d.p instead of 2 d.p? The db is on sql 2005. Any help would be great.

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  • Possible loss of precision; extracting char from string

    - by Troy
    I am getting a string from the user and then doing some checking to make sure it is valid, here is the code I have been using; char digit= userInput.charAt(0) - '0'; This had been working fine until I did some work on another method, I went to compile and have been receiving a 'possible loss of precision' error since then. What am I doing wrong?

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  • Arbitrary-precision arithmetic Explanation

    - by TT
    I'm trying to learn C and have come across the inability to work with REALLY big numbers (i.e., 100 digits, 1000 digits, etc.). I am aware that there exist libraries to do this, but I want to attempt to implement it myself. I just want to know if anyone has or can provide a very detailed, dumbed down explanation of arbitrary-precision arithmetic. Thanks!

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  • Managing arbitrary user permissions under PureFTPd

    - by Sebastián Grignoli
    I need to provide an FTP service that needs to be web-managed in the simplest way possible. My customer wants to create folders and users, and give them read only or read/write access arbitrarily. For example: The folder 'Documents' should be read only for several users, writable for internal users, and invisible for the rest. The folder 'Pictures' should be read only for journalists, writable for associates, and invisible for the rest. The folder 'Media' should be read only, writable or invisible for arbitrary users specified on the admin. There could be a large number of users and folders. I can't find a good way to accomplish that. I thought that I could give each user a home folder and put symlinks for the folders he has read access to, and make the user part of the folder's group when he has write access too, but now I think that this wouldn't work, because with PureFTPd (or ProFTPd) I can only specify the virtual user's mapping to a system user, and only one GUID for each virtual user. My approach requires that I could specify several GUIDs for each user (one by each folder he has write access to). I need to start programming this admin and I still don't know wich approach would work, if any. ¿Any ideas?

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  • Modifying value of "Rating" column within Explorer for arbitrary file types

    - by Fake Name
    Basically, I have a large body of assorted media (text, images, flash files, archives, folders, etc...) and I'm attempting to organize it. Windows Explorer has a rating column, but there seems to be no way to modify the rating of the files short of opening them in their type-specific software (e.g. Media player, or Photo viewer). However, this does not work when the file is of an unsupported type (.rar, .swf ...), or a directory. I'd be more than willing to consider a file-manager replacement (I've alreadly looked at quite a few, Directory Opus, Total Commander, etc...), or even a solution that stores the rating metadata in a hidden file in each folder, or a separate database. The one real critical requirement is the ability to sort by rating, and being filetype-agnostic. Basically, is there any way to categorize a large collection of assorted files by rating that will work with any file type, including directories? - Ideally, there would be an easy way to add arbitrary columns to windows explorer, and edit them directly. However, there seems to be no way to do this. The rating column is the next best thing.

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