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  • Maximum length of a std::basic_string<_CharT> string

    - by themoondothshine
    Hey all, I was wondering how one can fix an upper limit for the length of a string (in C++) for a given platform. I scrutinized a lot of libraries, and most of them define it arbitrarily. The GNU C++ STL (the one with experimental C++0x features) has quite a definition: size_t npos = size_t(-1); /*!< The maximum value that can be stored in a variable of type size_t */ size_t _S_max_len = ((npos - sizeof(_Rep_base))/sizeof(_CharT) - 1) / 4; /*!< Where _CharT is a template parameter; _Rep_base is a structure which encapsulates the allocated memory */ Here's how I understand the formula: The size_t type must hold the count of units allocated to the string (where each unit is of type _CharT) Theoretically, the maximum value that a variable of type size_t can take on is the total number of units of 1 byte (ie, of type char) that may be allocated The previous value minus the overhead required to keep track of the allocated memory (_Rep_base) is therefore the maximum number of units in a string. Divide this value by sizeof(_CharT) as _CharT may require more than a byte Subtract 1 from the previous value to account for a terminating character Finally, that leave the division by 4. I have absolutely no idea why! I looked at a lot of places for an explanation, but couldn't find a satisfactory one anywhere (that's why I've been trying to make up something for it! Please correct me if I'm wrong!!).

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  • Parsing string based on initial format

    - by Kayla
    I'm trying to parse a set of lines and extract certain parts of the string based on an initial format (reading a configuration file). A little more explanation: the format can contain up to 4 parts to be formatted. This case, %S will skip the part, %a-%c will extract the part and will be treated as a string, %d as int. What I am trying to do now is to come up with some clever way to parse it. So far I came up with the following prototype. However, my pointer arithmetic still needs some work to skip/extract the parts. Ultimately each part will be stored on an array of structs. Such as: struct st_temp { char *parta; char *partb; char *partc; char *partd; }; ... #include <stdio.h> #include <string.h> #define DIM(x) (sizeof(x)/sizeof(*(x))) void process (const char *fmt, const char *line) { char c; const char *src = fmt; while ((c = *src++) != '\0') { if (c == 'S'); // skip part else if (c == 'a'); // extract %a else if (c == 'b'); // extract %b else if (c == 'c'); // extract %c else if (c == 'd'); // extract %d (int) else { printf("Unknown format\n"); exit(1); } } } static const char *input[] = { "bar 200.1 / / (zaz) - \"bon 10\"", "foo 100.1 / / (baz) - \"apt 20\"", }; int main (void) { const char *fmt = "%S %a / / (%b) - \"%c %d\""; size_t i; for(i = 0; i < DIM (input); i++) { process (fmt, input[i]); } return (0); }

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  • parsing a string based on specified identifiers

    - by jml
    Let's say that I have the following text: input = "one aaa and bbb two bbbb er ... // three cccc" I would like to parse this into a group of variables that contain criteria = ["one", "two", "three"] v1,v2,v3 = input.split(criteria) I know that the example above won't work, but is there some utility in python that would allow me to use this sort of approach? I know what the identifiers will be in advance, so I would think that there has got to be a way to do this... Thanks for any help, jml

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  • What Regex can strip e.g. "note:" and "firstName: " from the left of a string?

    - by Edward Tanguay
    I need to strip the "label" off the front of strings, e.g. note: this is a note needs to return: note and this is a note I've produced the following code example but am having trouble with the regexes. What code do I need in the two ???????? areas below so that I get the desired results shown in the comments? using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Text.RegularExpressions; namespace TestRegex8822 { class Program { static void Main(string[] args) { List<string> lines = new List<string>(); lines.Add("note: this is a note"); lines.Add("test: just a test"); lines.Add("test:\t\t\tjust a test"); lines.Add("firstName: Jim"); //"firstName" IS a label because it does NOT contain a space lines.Add("She said this to him: follow me."); //this is NOT a label since there is a space before the colon lines.Add("description: this is the first description"); lines.Add("description:this is the second description"); //no space after colon lines.Add("this is a line with no label"); foreach (var line in lines) { Console.WriteLine(StringHelpers.GetLabelFromLine(line)); Console.WriteLine(StringHelpers.StripLabelFromLine(line)); Console.WriteLine("--"); //note //this is a note //-- //test //just a test //-- //test //just a test //-- //firstName //Jim //-- // //She said this to him: follow me. //-- //description //this is the first description //-- //description //this is the first description //-- // //this is a line with no label //-- } Console.ReadLine(); } } public static class StringHelpers { public static string GetLabelFromLine(this string line) { string label = line.GetMatch(@"^?:(\s)"); //??????????????? if (!label.IsNullOrEmpty()) return label; else return ""; } public static string StripLabelFromLine(this string line) { return ...//??????????????? } public static bool IsNullOrEmpty(this string line) { return String.IsNullOrEmpty(line); } } public static class RegexHelpers { public static string GetMatch(this string text, string regex) { Match match = Regex.Match(text, regex); if (match.Success) { string theMatch = match.Groups[0].Value; return theMatch; } else { return null; } } } }

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  • How do you tell if two wildcards overlap?

    - by Tom Ritter
    Given two strings with * wildcards, I would like to know if a string could be created that would match both. For example, these two are a simple case of overlap: Hello*World Hel* But so are all of these: *.csv reports*.csv reportsdump.csv Is there an algorithm published for doing this? Or perhaps a utility function in Windows or a library I might be able to call or copy?

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  • ruby - find and replace in a string for commonly used street suffix

    - by go minimal
    The post office actually publishes a list of commonly used street suffixes in addresses: http://www.usps.com/ncsc/lookups/abbr_suffix.txt I want to take this list and make a ruby function that takes a string, takes the last word ("183 main strt".split[' '].last) and if it matches any of the commonly used street suffixes ("strt"), replace it with the official Postal Service Standard Suffix ("st"). Is there a better way to approach this than a massive str.sub.sub.sub.sub.sub?

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  • Beautify Integer values for comparing as strings

    - by Zahra
    Hi. For some reason I need to enter my integer values to database as string, then I want to run a query on them and compare those integers as strings. Is there any way to beautify integer numbers (between 1 and 1 US billion as an example) so I can compare them as strings? Thanks in advance.

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  • [python] parsing a string based on specified identifiers

    - by jml
    Let's say that I have the following text: in = "one aaa two bbbb three cccc" I would like to parse this into a group of variables that contain notworking = ["one", "two", "three"] v1,v2,v3 = in.split(notworking) I know that the example above won't work, but is there some utility in python that would allow me to use this sort of approach? I know what the identifiers will be in advance, so I would think that there has got to be a way to do this... Thanks for any help, jml

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  • Regex: Match any character (including whitespace) except a comma

    - by selecsosi
    I would like to match any character and any whitespace except comma with regex. Only matching any character except comma gives me: [^,]* but I also want to match any whitespace characters, tabs, space, newline, etc. anywhere in the string. For example, I would like to be able to match all of this up until the comma: "bla bla bla" "asdfasdfasdfasdfasdfasdf" "asdfasdfasdf", Is there a simple way to do this without knowing where the whitespace may be?

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  • How can I map a String to a function in Java?

    - by Bears will eat you
    Currently, I have a bunch of Java classes that implement a Processor interface, meaning they all have a processRequest(String key) method. The idea is that each class has a few (say, <10) member Strings, and each of those maps to a method in that class via the processRequest method, like so: class FooProcessor implements Processor { String key1 = "abc"; String key2 = "def"; String key3 = "ghi"; // and so on... String processRequest(String key) { String toReturn = null; if (key1.equals(key)) toReturn = method1(); else if (key2.equals(key)) toReturn = method2(); else if (key3.equals(key)) toReturn = method3(); // and so on... return toReturn; } String method1() { // do stuff } String method2() { // do other stuff } String method3() { // do other other stuff } // and so on... } You get the idea. This was working fine for me, but now I need a runtime-accessible mapping from key to function; not every function actually returns a String (some return void) and I need to dynamically access the return type (using reflection) of each function in each class that there's a key for. I already have a manager that knows about all the keys, but not the mapping from key to function. My first instinct was to replace this mapping using if-else statements with a Map<String, Function>, like I could do in Javascript. But, Java doesn't support first-class functions so I'm out of luck there. I could probably dig up a third-party library that lets me work with first-class functions, but I haven't seen any yet, and I doubt that I need an entire new library. I also thought of putting these String keys into an array and using reflection to invoke the methods by name, but I see two downsides to this method: My keys would have to be named the same as the method - or be named in a particular, consistent way so that it's easy to map them to the method name. This seems WAY slower than the if-else statements I have right now. Efficiency is something of a concern because these methods will tend to get called pretty frequently, and I want to minimize unnecessary overhead. TL; DR: I'm looking for a clean, minimal-overhead way to map a String to some sort of a Function object that I can invoke and call (something like) getReturnType() on. I don't especially mind using a 3rd-party library if it really fits my needs. I also don't mind using reflection, though I would strongly prefer to avoid using reflection every single time I do a method lookup - maybe using some caching strategy that combines the Map with reflection. Thoughts on a good way to get what I want? Cheers!

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  • the font of xubuntu

    - by ubuntu
    HI: How to set the default font for different language in the xubuntu? For example, I am using xubuntu9.10(English release),and I do not like the default English and Chinese font. I have tried to use "Application-setting-appearance-fonts" to edit the default font,however it just work for the English. The default font of Chinese is "WenQuanYi Zen Hei". I do not like it. I want to use "Microsoft YaHei", I copy this file from my Win7 system. And I tried remove the "WenQuanYi Zen Hei" by "sudo aptitude remove ttf-wqy",it show me it is successfully removed. Also I have modify the file: /etc/fonts/conf.avail/69-language-selector-zh-cn.conf to: <fontconfig> <match target="pattern"> <test qual="any" name="family"> <string>serif</string> </test> <edit name="family" mode="prepend" binding="strong"> <string>Microsoft YaHei</string> <string>AR PL UMing CN</string> <string>AR PL ShanHeiSun Uni</string> <string>Bitstream Vera Serif</string> <string>DejaVu Serif</string> <string>AR PL UKai CN</string> <string>AR PL ZenKai Uni</string> </edit> </match> <match target="pattern"> <test qual="any" name="family"> <string>sans-serif</string> </test> <edit name="family" mode="prepend" binding="strong"> <string>Bitstream Vera Sans</string> <string>Microsoft YaHei</string> <string>DejaVu Sans</string> <string>AR PL UMing CN</string> <string>AR PL ShanHeiSun Uni</string> <string>AR PL UKai CN</string> <string>AR PL ZenKai Uni</string> </edit> </match> <match target="pattern"> <test qual="any" name="family"> <string>monospace</string> </test> <edit name="family" mode="prepend" binding="strong"> <string>Bitstream Vera Sans Mono</string> <string>Microsoft YaHei</string> <string>DejaVu Sans Mono</string> <string>AR PL UMing CN</string> <string>AR PL ShanHeiSun Uni</string> <string>AR PL UKai CN</string> <string>AR PL ZenKai Uni</string> </edit> </match> </fontconfig> However when I use the firefox, I found the title of the firefox window is not YaHei. See the image here So what is the problem?

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  • the font of xubuntu

    - by ubuntu
    HI: How to set the default font for different language in the xubuntu? For example, I am using xubuntu9.10(English release),and I do not like the default English and Chinese font. I have tried to use "Application-setting-appearance-fonts" to edit the default font,however it just work for the English. The default font of Chinese is "WenQuanYi Zen Hei". I do not like it. I want to use "Microsoft YaHei", I copy this file from my Win7 system. And I tried remove the "WenQuanYi Zen Hei" by "sudo aptitude remove ttf-wqy",it show me it is successfully removed. Also I have modify the file: /etc/fonts/conf.avail/69-language-selector-zh-cn.conf to: <fontconfig> <match target="pattern"> <test qual="any" name="family"> <string>serif</string> </test> <edit name="family" mode="prepend" binding="strong"> <string>Microsoft YaHei</string> <string>AR PL UMing CN</string> <string>AR PL ShanHeiSun Uni</string> <string>Bitstream Vera Serif</string> <string>DejaVu Serif</string> <string>AR PL UKai CN</string> <string>AR PL ZenKai Uni</string> </edit> </match> <match target="pattern"> <test qual="any" name="family"> <string>sans-serif</string> </test> <edit name="family" mode="prepend" binding="strong"> <string>Bitstream Vera Sans</string> <string>Microsoft YaHei</string> <string>DejaVu Sans</string> <string>AR PL UMing CN</string> <string>AR PL ShanHeiSun Uni</string> <string>AR PL UKai CN</string> <string>AR PL ZenKai Uni</string> </edit> </match> <match target="pattern"> <test qual="any" name="family"> <string>monospace</string> </test> <edit name="family" mode="prepend" binding="strong"> <string>Bitstream Vera Sans Mono</string> <string>Microsoft YaHei</string> <string>DejaVu Sans Mono</string> <string>AR PL UMing CN</string> <string>AR PL ShanHeiSun Uni</string> <string>AR PL UKai CN</string> <string>AR PL ZenKai Uni</string> </edit> </match> </fontconfig> However when I use the firefox, I found the title of the firefox window is not YaHei. See the image here So what is the problem?

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  • Unix: How to unsplit in screen

    - by Svish
    I'm trying to learn how to use screen, in unix so that I don't have to open up several ssh connections and terminal windows just because I want to do more than one thing at the same time on a machine. I have found the split command quite useful, but I have a problem I can't seem to figure out of... how do I unsplit?? I can split split using ^A S and switch between them using ^A ^I, but can't figure out how to remove a split...

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  • How to retain XML string as a string field during XML deserialization

    - by detale
    I got an XML input string and want to deserialize it to an object which partially retain the raw XML. <SetProfile> <sessionId>A81D83BC-09A0-4E32-B440-0000033D7AAD</sessionId> <profileDataXml> <ArrayOfProfileItem> <ProfileItem> <Name>Pulse</Name> <Value>80</Value> </ProfileItem> <ProfileItem> <Name>BloodPresure</Name> <Value>120</Value> </ProfileItem> </ArrayOfProfileItem> </profileDataXml> </SetProfile> The class definition: public class SetProfile { public Guid sessionId; public string profileDataXml; } I hope the deserialization syntax looks like string inputXML = "..."; // the above XML XmlSerializer xs = new XmlSerializer(typeof(SetProfile)); using (TextReader reader = new StringReader(inputXML)) { SetProfile obj = (SetProfile)xs.Deserialize(reader); // use obj .... } but XMLSerializer will throw an exception and won't output < profileDataXml 's descendants to "profileDataXml" field in raw XML string. Is there any way to implement the deserialization like that?

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  • Byobu Split Screens attaching to same session

    - by Capt.Nemo
    On a brand new install of Precise, after installing byobu, I'm facing the following behaviour: ie. all internal splits on byobu (using Ctrl+F2) will just attach to the same screen session. What I type on the left is reflected on the right. The solutions on this question while on the same problem do not help me out. I've tried the following: byobu-disable both inside and outside the byobu session byobu new-session byobu shell just runs a new simple screen session as far as I can figure it out. This does not include terminal splits, so it does not help me. byobu -S screen-name lets me create two separate byobu sessions, but split screens lead to duplicates in both.

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  • Graphics on boot split into three sections

    - by a sandwhich
    I just installed 13.04 onto a new laptop because of the ease of install with the uefi bios. When I boot the system though, the screen is split into three sections each about 640x200 at the top of the screen, with the active terminal mirrored across them. Although I can login, startx fails due to something about a file. I have tried booting with vga=711 and normal nomodeset with no success. Booting the live usb I originally installed from results in the same issue. The graphics driver in the xorg.conf.something from what I can make out is set to vesa, but it could be set to some other four character value that is similar to vesa, hard to tell. How can I fix this? One thing to note, the laptop has two dedicated GT 750m's, along with the intel 4000 built into the processor. This is what it looks like, the purple box is what the grub2 menu was in before boot.

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  • Split vector vs matrix notation for transformation

    - by seahorse
    Some rendering engines like Ogre prefer to use a individual vector based notation for transformations like the following Split vector notation: Net Transformation is represented by Scale vector = sx, sy, sz Transformation vector = tx, ty, tz Rotation Quaternion Vector = w,x,y,z Matrix notation: There are other engines which simply use a net combined transformation matrix. What are the advantages of the first notation over the second? Also for animation interpolation does it work in the first notation that we interpolate across the individual components and use the interpolated parts to get the net transformation? Is this another advantage?

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  • Split screen and other issues on Ubuntu 11.10 with ATI graphics card

    - by garus
    Ever since updating my Ubuntu 11.04 to 11.10 I experience issues with graphics. The biggest is the "split screen" effect where my desktop is shifted to the right, resulting in having Unity bar in the middle of the screen. As shown here: http://i.imgur.com/I8nmZ.jpg This changes from boot to boot, sometimes it's on the left, sometimes in the middle. What I tried: Removing fglrx drivers completely Installing post-update version of them, but installation is broken ATM in the Ubuntu, so no go. No one is even trying to fix it (bug report https://bugs.launchpad.net/ubuntu/+source/nvidia-common/+bug/873058 and a couple of duplicates out there) Also using the open source "radeon" driver results in the same (I have a better successful boot ratio with this one, proprietary rarely lets me boot) Other artifacts are: serious screen tearing weird lines flickering in random places lagginess Did anyone experience that? My specs: Ubuntu 11.10 AMD Radeon HD 6950 1GB

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  • Split a partition with GParted

    - by Eray
    These are my current disk partitions. /yedek is for some personal backup files. As you can see there is only Ubuntu on my PC. I will install Windows, too. Because of this I want to shrink /dev/sda3 . It currently 546GB and I want to split it: 300GB for / and 246GB for Windows (NTFS) is OK for me. I'm using GParted for the first time. How can I shrink /? I don't want to lose any datas from Ubuntu.

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  • Game maps with "counties" that are split along lines that aren't necessarily straight

    - by pm_2
    I want to create a game environment that supports a 2D map. This is a really basic map, but must be split along lines that are not necessarily straight. So imagine a country with county boundaries. I then want to be able to detect drag / drop events within these counties. What I'm really looking for here is a pointer to where to start on this (how it has been done before - any existing libraries out there), as I'm sure that what I'm trying to do is not new - although I can't find a beginners guide for this anywhere.

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  • Django - need to split a table across multiple locations [closed]

    - by MikeRand
    Hi all, I have a Django project to track our company's restructuring projects. Here's the very simple model: class Project(models.Model): code = models.CharField(max_length=30) description = models.CharField(max_length=60) class Employee(models.Model): project = models.ForeignKey(Project) employee_id = models.IntegerField() country_code = models.CharField(max_length=3) severance = models.IntegerField() Due to regulations in some European countries, I'm not allowed to keep employee-level severance information in a database that sits on a box outside of that country. In Django, how do I manage the need to have my Employee table split across multiple databases based on an Employee attribute (i.e. country_code) in a way that doesn't impact anything else in the project (e.g. views, templates, admin)? Thanks, Mike

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  • how to split data using mysql [closed]

    - by user75238
    I want to display images on left side and right side on my website. For example in this code I have 8 images and I want to split them 4 on the left side and 4 on the right side. In between them I want to put text. How can I do this? $display_image2=mysql_query("select id_topic,topic_title,image2 from topics where image2 not like '' order by id_topic desc limit 8")or die (mysql_error()); This is an image clarify what I want to do: http://oi50.tinypic.com/wsok1t.jpg

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  • Fastest way to access VB6 String in C#

    - by Simon Woods
    Hi I am using COMInterop. I have a call in VB6 which returns a string of roughly 13000 chars. If I execute the call in pure VB6 it takes about 800ms to execute. If I execute it via c# and COMInterop it takes about 8 seconds. I'm assuming the delay is caused by marshalling. If I am correct about marshalling, I'd be grateful if someone could suggest the fastest way I can get this into C#. e.g. Would it be better to a) expose it as a byte array b) provide a byref string param into the VB6 layer I would appreciate some sample code as well. I tried the Marshal.PtrToStringAuto(Marshal.ReadIntPtr(myCOMObject.GetString, 0) to no avail Many thx S

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