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  • Is there an additional runtime cost for using named parameters?

    - by Jurily
    Consider the following struct: public struct vip { string email; string name; int category; public vip(string email, int category, string name = "") { this.email = email; this.name = name; this.category = category; } } Is there a performance difference between the following two calls? var e = new vip(email: "foo", name: "bar", category: 32); var e = new vip("foo", 32, "bar"); Is there a difference if there are no optional parameters defined?

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  • parsing/matching string occurrence in C

    - by David
    I have the following string: const char *str = "\"This is just some random text\" 130 28194 \"Some other string\" \"String 3\"" I would like to get the the integer 28194 of course the integer varies, so I can't do strstr("20194"). So I was wondering what would be a good way to get that part of the string? I was thinking to use #include <regex.h> which I already have a procedure to match regexp's but not sure how the regexp in C will look like using the POSIX style notation. [:alpha:]+[:digit:] and if performance will be an issue. Or will it be better using strchr,strstr? Any ideas will be appreciate it

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  • What do you enjoy about programming?

    - by Earlz
    Some of us here(or is it just me?) enjoy programming. Even if we're not being paid for it, and in some cases, even though the end result will not do anything for us. For example, many people do the Project Euler problems just for fun, and in the end nothing was really "accomplished" materially. What is it that makes us enjoy programming? How is programming different from another job? You don't see an accountant going home to do some accounting on their own time just for the pure joy of it. How are we different? (also, if anyone has some ideas on how to tag this, then please do correct it for me.. )

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  • Is it really wrong to version documents using CouchDB's behaviour?

    - by Tomas Sedovic
    This is one of those "I know I shouldn't do this but it's oh so convenient." questions. Sorry about that. I plan to use CouchDB for storing a bunch of documents and keeping their entire revision history. CouchDB does the versioning automatically, but it is strongly discouraged for programmer's use: "You cannot rely on document revisions for any other purpose than concurrency control." From what I've found on the CouchDB wiki, the versions can get deleted either during compaction or during replication. As far as I can tell, Compaction must always be triggered manually and Replication occurs only when there's more than one database server. The question is: if I won't run compaction and will use only single database instance for my documents, can I just use CouchDB's document versioning and expect it to work? What other problems I might run into? E.g. does not running compaction hurt the performance or consume significantly more disk space (than if I did handle the versioning manually)?

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  • calculate the rendering of a custom control

    - by Marc Jonkers
    In an xpage I would like to be able to decide which custom controls have to be rendered or loaded. I have a custom control named 1, another 2, 3 etc When a scoped variable has the value 1, custom control 1 should be displayed/rendered/loaded. A value of 2 , custom control 2 has to be displayed. etc I came up with following sollution : I calculate if that custom control has to be loaded or not depending on the value of the scoped variable. Since I have 8 of these custom controls on 1 page I was wondering ,since only 1 out of those 8 custom controls have to be rendered ,if there isn't a better way with less code to do the same job. Won't my sollution put a lot of load to my server ?

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  • .htaccess redirect https to http not working

    - by Ira Rainey
    I am trying to catch any https traffic to the front of my site so: https://www.domain.com is redirected to: http://www.domain.com However other subdomains need to be redirected elsewhere. For the most part this is all working, apart from the https - http redirection. Here's my .htaccess file at the moment: RewriteEngine On RewriteCond %{HTTPS} on RewriteRule (.*) http://%{HTTP_HOST}%{REQUEST_URI} RewriteCond %{HTTP_HOST} ^domain\.com [NC] RewriteRule ^(.*)$ http://www.domain.com/$1 [L,R=301] RewriteCond "%{HTTP_HOST}" !^www.* [NC] RewriteCond "%{HTTP_HOST}" ^([^\.]+).*$ RewriteRule ^(.*)$ https://secure.domain.com/a/login/%1 [L,R=301] It would seem that this bit: RewriteCond %{HTTPS} on RewriteRule (.*) http://%{HTTP_HOST}%{REQUEST_URI} isn't working as I would imagine. In fact it doesn't seem to redirect at all. In another subdirectory I have the opposite in effect which works fine: RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} so my thinking is the opposite should have done the job, but seemingly not. Any thoughts anyone?

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  • ExtJS Grid slow with 3000+ records

    - by Oliver Watkins
    I am using ExtJS Grid and its getting pretty slow with 3000+ records. Sorting takes about 4 seconds. Compared to other more Javascript tables, this is pretty slow. I am thinking maybe to use pagination in my table. However after reading the documentation, I am still a bit unsure about how pagination works in extjs. Does this pull data from the server each time u turn a page? I would prefer that wasn't the case. I would prefer the 3000 records are saved in the browser and then what is rendered is just a portion of those rows. Also I am using Extjs version 4.2.1. If I upgrade to version 5. will I get some performance improvements?

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  • How to generate Makefiles with Cmake to create tarballs of project?

    - by Rizo
    I like to keep my Makefiles flexible and multifunctional. One of the tasks I usually add to make command is tar, for example the following instruction does the job: tar: tar -cvf $(PROGNAME).tar $(SRCS) Makefile My question is: How can CMake be used to generate personalized commands like tar? I would like to see some code samples. For the full functionality it would be useful to create project's components and be able to use them as parameters. (Exempli gratia: archive only header files or some specific library). Thanks in advance for your answers!

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  • OpenGL and layouts

    - by Hnefi
    I'm using OpenGL to render a game view in my android application. The game is turn based and I wish to add some buttons to the interface. I'd prefer to use standard Android widgets, structured in an XML-generated layout (or, if I have to, a hardcoded layout) and put the OpenGL view in its own window as part of that layout. So in regards to this, I have 3 questions: 1: Is such a thing possible? I've done a few half-hearted tries, but have had no luck so far. 2: Is such a thing advisable? Does it carry a significant performance penalty, for example, over using OpenGL-based homebrew widgetry? 3: Is it possible to pass particular arguments to instances created in XML layouts? For example, my current OpenGL view has three arguments in its constructor; is it somehow possible for me to invoke that particular constructor with particular parameters when it's part of a layout?

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  • Is both approach same ?

    - by Harikrishna
    I have one datatable which is not bindided and records are coming from the file by parsing it in the datatable dynamically every time. Now there is three columns in the datatable Marks1,Marks2 and FinalMarks. And their types is decimal. Now for making addition of columns Marks1 and Marks2 's records and store it into FinalMarks column,For that what I do is : datatableResult.Columns["FinalMarks"].Expression="Marks1+Marks2"; It's works properly. It can be done in other way also is foreach (DataRow r in datatableResult.Rows) { r["FinalMarks"]=Convert.ToDecimal(r["Marks1"])+Convert.ToDecimal(r["Marks2"]); } Now I don't know that which is the best way to do this means performance wise. Is first approach same as second approach in background means is both approach same or what?

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  • Is select() Ok to implement single socket read/write timeout ?

    - by chmike
    I have an application processing network communication with blocking calls. Each thread manages a single connection. I've added a timeout on the read and write operation by using select prior to read or write on the socket. Select is known to be inefficient when dealing with large number of sockets. But is it ok, in term of performance to use it with a single socket or are there more efficient methods to add timeout support on single sockets calls ? The benefit of select is to be portable.

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  • Choosing between assembler and COBOL

    - by Azares Cob
    I have to rewrite and greatly modify parts of a legacy COBOL application. The COBOL source-code is available (around 100.000 lines of copy & pasted code mixed with GOTOs). Some more details on the system: It is a general management system controlling transactions, bank management, customer data and employees of the company I work for. The COBOL-powered database is about 4 Terabytes distributed over 50 old HDDs. (But messing around with them is the sysadmins job) They are using COBOL85 only. Now I have two options: Rewrite and refactor 50% of the old COBOL system, or use X86 assembly. Should I use X86 assembler or COBOL?

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  • What FIX implementation do you recommend for use with .NET

    - by Ajaxx
    I am reviewing implementation choices for FIX when using .NET. A few obvious choices come to mind, but I want to know if there are other options, better choices or if we've made the same decision as a lot of you. QuickFIX - Stable, C++ implementation - so you've got unmanaged code to interop with. FIX4NET - C# implementation - seems to have some gaps in its implementation. DIY - Chime in here if you've made your own FIX engine Let me throw in some caveats here. I'm not looking for sub 100 microsecond processing. Performance is a requirement, but not so much that it's driving my decisions. A solid product that is stable, performs well and is flexible enough to deal with vendor specific dialects is the sweet spot. The more we can do in .NET the better.

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  • Java and Different Types of Stacks

    - by Rarge
    Currently the only stack I know anything about is Vector, I normally use this in place of an array but I understand that there is other types of stacks and they all suit different jobs. The project I am currently working on requires me to be inserting objects in a certain position inside a stack, not always the front of the stack and I am under the impression that a Vector may not be the best class for this job. Could somebody please give me a brief description of the other types of stacks available to me with the Java language and their advantages and disadvantages? Are these names homogeneous? E.g. Are they only used in the Java language or are they used as general terms in Computer Science? Thank you

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  • Slow Client connection blocks Mongrel

    - by Sanjay
    I have a Apache + Haproxy + Mongrel setup for my rails application. When I hit a particular server page, mongrel takes around 100ms to process the request and I get the page in around 5 secs due to data transmission time on my slow home connection. Now I see that during these 5 secs of data transmission, mongrel does not serve any other request. I am surprised as that means mongrel is serving the response html to the client and is blocked till the client receives it. Shouldn't serving response be the job of Apache? This puts serious bottleneck in the no of requests Mongrel can serve as that would depend on the speed of the client connection. Is there any way that html generated by mongrel is served by apache/haproxy or any other web server like nginx? I wonder how the other high traffic sites are managing it?

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  • Conceptually, how does replay work in a game?

    - by SnOrfus
    I was kind of curious as to how replay might be implemented in a game. Initially, I thought that there would be just a command list of every player/ai action that was taken in the game, and it then 're-plays' the game and lets the engine render as usual. However, I have looked at replays in FPS/RTS games, and upon careful inspection even things like the particles and graphical/audible glitches are consistent (and those glitches are generally *in*consistent). So How does this happen. In fixed camera angle games I though it might just write every frame of the whole scene to a stream that gets stored and then just replays the stream back, but that doesn't seem like enough for games that allow you to pause and move the camera around. You'd have to store the locations of everything in the scene at all points in time (No?). So for things like particles, that's a lot of data to push which seems like a significant draw on the game's performance whilst playing.

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  • [Symfony] Admin generator and i18n

    - by David
    I have read lots of questions about i18n, but I haven't found any about performance. I have a simple backend app listing the contents of an ads table. These ads have a category, that is translated in some languages (it's defined as i18n in the Doctrine schema). So, when I add a "table_method" in my generator.yml to include de Category table, it reduces the number of queries, but there are yet some of them referencing i18n translation tables. So, if I add the category Translation table to the query, it reduces even more the queries BUT it increases the processing time considerably. Why this time penalty? Just because of the translation table? And why isn't the filter using this method to avoid so many translation queries as well? I mean, if I want to filter by category, it is making one query per category to include the translation table. Why??

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  • How to column-ify an output from a certain program?

    - by mbaitoff
    I have a program that generates and outputs a sequence of simple sample math homework tasks, like: 1 + 1 = ... 3 + 3 = ... 2 + 5 = ... 3 + 7 = ... 4 + 2 = ... a sequence can be quite long, and I'd like to save space when this sequence is printed by converting it as follows: 1 + 1 = ... 3 + 7 = ... 3 + 3 = ... 4 + 2 = ... 2 + 5 = ... that is, wrapping the lines into the two or more columns. I was expecting the column linux utility to do the job using the -c N option witn N=2, however, it still outputs the lines in one column whatever the N is. How would I do the column-ifying of the sequence of lines?

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  • How does Core Data determine if an NSObjects data can be dropped?

    - by Kevin
    In the app I am working on now I was storing about 500 images in Core Data. I have since pulled those images out and store them in the file system now, but in the process I found that the app would crash on the device if I had an array of 500 objects with image data in them. An array with 500 object ids with the image data in those objects worked fine. The 500 objects without the image data also worked fine. I found that I got the best performance with both an array of object ids and image data stored on the filesystem instead of in core data. The conclusion I came to was that if I had an object in an array that told Core Data I was "using" that object and Core Data would hold on to the data. Is this correct?

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  • what do i need to do now that I want to take programming hobby to next level ?

    - by hohog
    i've always wanted to make games but did not start actively learning programming by myself until 1st year of university. i kept going throughout university learning new languages, showing off things i had made, while neglecting my major in Biology. Anyways, i've ended up with an Economics degree, with a portfolio of SaaS and web apps i had created so i could eat during my final year. So far, I'm getting a few interviews here and there in web programming positions. When I get a logic pretest, I fail miserably. or job requires comp sci degree. I mean I can easily design and code an entire app which I emphasize through my portfolio.... but i dont know why I am so slow at logic puzzles on prescreening interview... So what should I do now ? get certificates in languages ? go back to school and learn CS ? is it too late to get into windows programming jobs than web programming ?

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  • How to receive HTTP messages using Socket

    - by Poma
    I'm using Socket class for my web client. I can't use HttpWebRequest since it doesn't support socks proxies. So I have to parse headers and handle chunked encoding by myself. The most difficult thing is to determine length of content so I have to read it byte-by-byte. First I have to use ReadByte() to find last header ("\r\n\r\n" combination), then read chunk's size etc. But this approach has very poor performance. Can you suggest better solution? Maybe some open source examples or libraries that handle http request through sockets (not very big and complicated though, I'm a noob)

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  • Examples of fast .NET WPF/WinForms apps?

    - by mythz
    I am currently investigating whether to build a windows application using unmanaged C/C++ or in .NET and would like to know of the kind of performance and responsiveness that is capable with a managed C#/.NET GUI app? Not surprisingly it looks like the fastest most responsive applications (e.g. chrome, spotify, etc) are written in unmanaged C/C++. I've had a hard time finding examples of really good .NET applications and so I would like some help. What's the best example of a fast and responsive .NET windows application?

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  • tkinter python entry not being displayed

    - by user1050619
    I have created a Form with labels and entries..but for some reason the entries are not being created, peoplegui.py from tkinter import * from tkinter.messagebox import showerror import shelve shelvename = 'class-shelve' fieldnames = ('name','age','job','pay') def makewidgets(): global entries window = Tk() window.title('People Shelve') form = Frame(window) form.pack() entries = {} for (ix, label) in enumerate(('key',) + fieldnames): lab = Label(form, text=label) ent = Entry(form) lab.grid(row=ix, column=0) lab.grid(row=ix, column=1) entries[label] = ent Button(window, text="Fetch", command=fetchRecord).pack(side=LEFT) Button(window, text="Update", command=updateRecord).pack(side=LEFT) Button(window, text="Quit", command=window.quit).pack(side=RIGHT) return window def fetchRecord(): print('In fetch') def updateRecord(): print('In update') if __name__ == '__main__': window = makewidgets() window.mainloop() When I run it the labels are created but not the entries.

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  • get data from to tables !

    - by mehdi
    i want to sort my users based on most viewed profile in my user list . i have these two tables but i don't know how to right correct query to make this happen . i used grouping like this : $sql ="select userid , count(*) form profile_visit group by userid " ; but it's not make sense to me , i don't think this query will help me at all . +-----------+---------------+------+-----+-------------------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------------+------+-----+-------------------+----------------+ | userid | int(11) | NO | PRI | NULL | auto_increment | | username | varchar(128) | NO | | NULL | | | password | char(40) | NO | | NULL | | | email | varchar(128) | NO | | NULL | | | name | varchar(256) | NO | | NULL | | | lastname | varchar(256) | NO | | NULL | | | job | varchar(256) | NO | | NULL | | | birthdate | varchar(100) | NO | | NULL | | | address | varchar(1024) | NO | | NULL | | | website | varchar(100) | NO | | NULL | | | tel | varchar(100) | NO | | NULL | | | role | tinyint(1) | NO | | 0 | | | reg_date | timestamp | NO | | CURRENT_TIMESTAMP | | +-----------+---------------+------+-----+-------------------+----------------+ and profile_visit table like this +------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------+-------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | ip_address | varchar(70) | NO | | NULL | | | userid | int(11) | NO | | NULL | | +------------+-------------+------+-----+---------+----------------+

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  • Programming practice

    - by exc1z
    I've decided to get some experience working on some project this summer. Due to local demand on market I would prefer to learn Java (Standard and Enterprise Editions). But I can't even to conjecture what kind of project to do. Recently I had some ideas about C. With C I could to contribute to huge Linux projects. I don't mean that my work will be surely commited. I could get the code and practice with it. But C it's not right thing to get good job in my area. In case of JavaSE there is a chance to develop some desktop applications. But thinking about JavaEE I get stuck. I'll be very thankful for answers.

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