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  • Why is this C or C++ macro not expanded by the preprocessor?

    - by Atul
    Can someone points me the problem in the code when compiled with gcc 4.1.0. #define X 10 int main() { double a = 1e-X; return 0; } I am getting error:Exponent has no digits. When i replace X with 10, it works fine. Also i checked with g++ -E command to see the file with preprocessors applied, it has not replaced X with 10. I was under the impression that preprocessor replaces every macro defined in the file with the replacement text with applying any intelligence. Am I wrong? I know this is a really silly question but I am confused and I would rather be silly than confused :). Any comments/suggestions.

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  • Problem while compiling the code

    - by Atul
    Can someone points me the problem in the code when compiled with gcc 4.1.0. #define X 10 int main() { double a = 1e-X; return 0; } I am getting error:Exponent has no digits. When i replace X with 10, it works fine. Also i checked with g++ -E command to see the file with preprocessors applied, it has not replaced X with 10. I was under the impression that preprocessor replaces every macro defined in the file with the replacement text with applying any intelligence. Am I wrong? I know this is a really silly question but I am confused and I would rather be silly than confused :). Any comments/suggestions.

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  • how does [<Literal>] differ from other constants in F#

    - by Mitzh
    I am a bit confused by the Literal keyword and why it is necessary in F#. Reading the docs, it sounds to me that [<Literal>] is used to define a constant, however I am a bit confused how this constant differs from all other constants in F#.. Values that are intended to be constants can be marked with the Literal attribute. This attribute has the effect of causing a value to be compiled as a constant. When I think of a constant, I think of something which is immutable.... let x = "a" + "b" //this is a immutable value, its value is constant [<Literal>] let y = "a" + "b" //this is also a immutable value, but why is this a special constant? Is it because the 'normal' F# values are evaluated lazily and the [<Literal>] is not evaluated lazily..? is that what they mean with 'compiled as constant'..? or is there something else to it?

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  • C# thread safety for class instances

    - by Steveng
    I am learning C# and I am confused with the thread safety of the copies of the class instances as below: eg: classA objA; classA objB = objA; objA.field1 = value2; //do I need lock around modification of field1? //let say we pass the objB to another thread objB.field1 = value1 //do I need a lock for objB because of the modification of field1? I am confused because coming from the background of C++, the class in C# is the reference type. If both objA and objB refer to the same memory underlying, then I would need a lock to protect the simultaneous writing to the field1. Could someone confirm with this or am I missing something? Thanks.

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  • what's the job of std::unique_lock when used with std::conditional_variable::wait()

    - by Mike
    I'm quite confused with the need of a std::unique_lock when wait a std::conditional_variable. So I look into the library code in VS 2013 and get more confused. This is how std::conditional_variable::wait() implemented: void wait(unique_lock<mutex>& _Lck) { // wait for signal _Cnd_waitX(&_Cnd, &_Lck.mutex()->_Mtx); } Is this some kind of joke? Wrap a mutex in a unique_lock and do nothing but get it back latter? Why not just use mutex in the parameter list?

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  • Why is it called NoSQL?

    - by beef jerky
    I've recently worked with MongoDB and learned about its schemaless design. However, I'm confused with the term NoSQL? Why is it called that? Doesn't it use SQL or SQL-like queries? I've also read from an article that the main difference lies in how data is stored. In the case of MongoDB, it's stored like JSON documents. Is this true? Also, I'm confused why I always see 'NoSQL vs relational databases'. Aren't NoSQL databases relational? I believe documents in MongoDB are still related/linked through some keys (please correct me if I'm wrong). So why is it labeled as non-relational? Thanks in advance!

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  • Install Git under OSX Mavericks

    - by Jan Hancic
    I've just completed a fresh install of Mavericks. Then I went to git-scm.com and downloaded the Mac installer and installed Git from that. Now whenever I go into the terminal and type git I get this: xcode-select: note: no developer tools were found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools. I also this dialog: The git installer installed git into /usr/local/git/bin and I've added this to my PATH but still no dice. What am I doing wrong here? I don't want to install xcode just so I can use git.

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  • Does any upgrade version of Visual Studio require an installed development tool?

    - by Will Eddins
    I'm wondering this from a legal standpoint and an installation-issue standpoint. I'm considering pre-ordering Visual Studio 2010 for future use in some home projects, and you cannot pre-order a full version, only an upgrade version. On the preorder page, it says: Eligible for upgrade with any previous version of Visual Studio or any other developer tool. In reality, I think it won't require anything installed, but from a legal standpoint, is this inclusive with development tools such as Eclipse? After installing Windows 7 on this PC, Eclipse is currently the only IDE I have installed. But really anything could be considered a developer tool, such as Notepad++ or Kaxaml. How has this worked in regards to previous upgrade versions?

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  • Cannot find the "Create Network" menuitem in the WiFi icon menu in Mountain Lion

    - by Chuancong
    I am using Mountain Lion Developer Preview 2. I cannot find the "Create Network" menuitem in the WiFi icon menu in the menubar. It was there before when I was using Lion. It started missing since I upgraded to Mountain Lion Developer Preview 1. By the way, is there any other method to create an ad-hoc WiFi network on OS X? I tried to use Internet Sharing via WiFi, but other devices using the shared connection could not find the Mac in their local networks. I am using an early 2011 MacBook Pro 15'. Thanks.

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  • Best Amazon S3 File Manager Utility?

    - by mmacaulay
    Ever since I started using Amazon's S3 service I've been struggling to find a good solution for simple file management, without having to write my own app to browse my buckets, upload and delete files, etc. The best I've found so far to do this is S3Fox. But it's far from perfect, it has problems deleting files and folders. Comments on the Firefox plugin page indicate I'm not the only person with this problem and the developer does not respond to emails. I've looked around briefly, but couldn't find anything that looked any better than S3Fox. Please tell me there's a better way! Edit (07/26/2009): The Firefox S3Fox extension seems to be getting love from its developer again, the problems I was having before have gone away, and I'm using it on a regular basis now with no problems!

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  • odd system name showing up in terminal

    - by sam
    Ive been working on some command line stuff with an external developer through team viewer for work, to interact with th CL i use terminal on OSX, when working with the developer i was always watching what they were doing and i also have all the bash history. Usually upon opening terminal i get something like this Last login: Tue Sep 17 21:33:02 on ttys001 You have mail. unknown-5c:00:00:00:00:00:~ sam$ (note ive replaced some characters in the last line with 00) But today when i opened up terminal and i get this Last login: Mon Oct 21 16:49:35 on ttys000 You have mail. richies-ipad:~ sam$ Note it now says richies-ipad - any idea why this is ? I dont know any one called richie let alone let them have access to my machine. Is this something to be worried about - the fact that someone has enough access to change that ? Also what does the ttys001 part on the first line mean ?

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  • How/where to find all Update (msu) packages for Windows 7 (Enterprise)

    - by Rudi
    Hi, I've been using Wim2Vhd to create native boot vhd files. (I'm using this to keep several development environments ready, I'm a developer, I know -- I need help ;-) Now the first boot always ends up in several minutes installing all of the windows updates... I' know I could avoid this if I had a massive list of qfe (.msu) packages that I could supply to the command line of Wim2Vhd. Where can I find all of the updates so I can download them. I have found this: http://www.megaleecher.net/Downloading_Microsoft_Windows_7_Offline_Updates but I'd like a more official source and I'd like an easier way to download them all. I'm a developer, so if I find the information (web service?) to get all the current packages, I'll build a tool to download them to a single location and generate a list of them for use with Wim2Vhd.

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  • What is magento ecommerce plotting ???

    - by numerical25
    I am not sure if this is the appropriate place to to discuss this issue but I am a Magento developer and ever since they announced they were going to build magento as a PAAS platform, I began to not trust where they are trying to go with the company. As a business I respect where they are trying to go as a company, but as a developer who highly depends on their platform for my business, I feel that they will eventually become a player in their own game. Ebay has announced that they will be acquiring the license to the magento platform and this makes you wonder why a company like eBay would want to do such a thing. Ebay is known for their pre-built stores. it would seem they would only team with magento only to utilize their PAAS web stores. I dunno, maybe I am a little confused about the whole situation. that's why i would like to hear everyone else opinion.

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  • How can I allow individual developers to have their own space to create git repositories?

    - by Jason Baker
    I have a server that is essentially a gitosis setup. I have a git user that has access to all the shared repositories. What I would like to do is have each developer be able to have their own "area" on this server to create their own repositories. I'd like these areas to be able to be viewable via gitweb. How can this be done that would require the least maintenance in terms of adding users and repositories? One obvious solution would be to just allow each developer to create repositories on the git login and have branches named something like <devname>-<reponame>. But I could see this getting unmanageable as the number of developers grows.

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  • IIS 7 throws 401 responses on application whose physical directory has been shared

    - by tonyellard
    I have an IIS 7, Windows Server 2008 R2 box with a relatively fresh install. I've deployed a .NET 2.0 application using windows autentication to the server, and from the default website, added it as an application. I updated the IIS authentication to enable Windows Authentication. When I went to share out the physical directory for the application so that a developer could deploy updates, the users began to receive 401 errors. I can reliably recreate the issue by sharing out the directory of any newly created application. The IIS user has the necessary read/write access to the directory. What do I need to do to keep web users from receiving 401's while at the same time allowing this developer to have access to the physical directory for deployments? Thanks in advance!

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  • Can a working Tomcat 6 webapp be turned into a usable .war file?

    - by Bill Cole
    Problem: I have a working webapp on a FreeBSD 8.1 Tomcat 6 test server that I need to move to a production system. The developer who last touched it (and had root on that server) has moved on and isn't helpful. The running app seems to have been deployed from a CVS server that is now unavailable. My thinking is that I would like to find a way to wrap the working webapp into a proper .war so that I can deploy it on a pristine host and (after testing) send the existing system to a very deep bitbucket. But I'm not having luck finding a way to do that. I'm a sysadmin not a developer and don't work much with Tomcat systems so I may be (likely am) overlooking something blindingly simple. I gather that I may be able to just tar up the deployed directory and untar it on the new machine, but I have a nagging feeling that there are pitfalls in that.

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  • Is memcached pre-installed with Xcode on OS X?

    - by GeneQ
    The answer seems to be yes, according to Apple's documentation. To make sure I'm not hallucinating, I checked Apple's developer tools documentation. Yes, memcached is supported and documented by Apple: Apple Developer Library : memcached(1) Apparently, memcached is installed with Xcode since at least 10.6 onwards. The reason I'm asking this is that on the Web and on SO there are lots people asking how to install memcached on OS X but curiously no one seems to mention that the easiest way to do so is to simply install Xcode via the AppStore (or using a DMG). All the answers given involves using homebrew or some other complicated way to install memcached from source. Is there any compelling reason why the Apple shipped memcached is not good enough? I don't see any advantages of compiling and installing memcached from source since there's an Apple supported version.

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  • Configure users and groups for Git

    - by Peter Penzov
    I want to create Git server on which every developer can commit code with his own linux account. The Git repository is initialized under the directory /opt/git_repo.git I created a group developers which owns the directory git_repo.git. Then I created three users which are part of the same group - DeA, DevB, DevC. I created a soft link into each developer home directory which points to the /opt/git_repo.git location. The problem is that when a user connects to the Git server and use the soft link to access the files he cannot do it. Can you help me what are the proper steps and commands to configure the repository?

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  • Clear/ Reset Result Table of Search page in OAF

    - by PRajkumar
    Normally problem faced by developers after creating Search Page is how to Clear/ Reset Result Table when developer open search page first time or after search when developer redirecting back to same search page from any other page (say delete page or update page)   Add following Code in your Search page Controller where you have constructed your Query Region   import oracle.apps.fnd.framework.webui.beans.layout.OAQueryBean; ... public void processRequest(OAPageContext pageContext, OAWebBean webBean) {  super.processRequest(pageContext, webBean);  OAQueryBean queryBean = (OAQueryBean)webBean.findChildRecursive("QueryRN");   // Here QueryRN is your Query Region Name as shown in following snap shot  queryBean.clearSearchPersistenceCache(pageContext); }     Note – After add this code, no need to worry about state of Application Module (AM). This code will clean up result table automatically every time when you will open Search page first time and when you are redirecting back to search page. But still as per good coding standard while redirecting back to search page always keep AM state to FALSE

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  • SQL SERVER – Tricks to Comment T-SQL in SSMS – SQL in Sixty Seconds #019 – Video

    - by pinaldave
    Code commeting is the one of the most common tasks developers perform. There are two major reasons why developer comment code. 1) During Debug 2) Documenting the code. While debugging the T-SQL code I have often seen developers struggling to comment code.  They spend (or waste) more time in commenting and uncommenting  than doing actual debugging of the procedure.  When I see developer struggling to comment the code I feel little uncomfortable as commenting should be a very easy task over. Today we will see three quick method to comment T-SQL code in Query Editor. There are three different method to comment and uncomment statements in SQL Server Management Studio Using Keyboard Shortcuts Using Tool Bar Using Menu Bar Method 1: Using Keyboard Shortcuts Commenting the statement – CTRL+K, CTRL+C Commenting the statement – CTRL+K, CTRL+U Method 2: Using Tool Bar Using Tool bar buttons. (See Video) Method 3: Using Menu Bar Commenting the statement – Menu Bar >> Edit >> Advanced >> Click on Comment Selection. Unommenting the statement – Menu Bar >> Edit >> Advanced >> Click on Uncomment Selection. More on Importing CSV Data: Two Different Ways to Comment Code – Explanation and Example I encourage you to submit your ideas for SQL in Sixty Seconds. We will try to accommodate as many as we can. If we like your idea we promise to share with you educational material. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Database, Pinal Dave, PostADay, SQL, SQL Authority, SQL in Sixty Seconds, SQL Query, SQL Scripts, SQL Server, SQL Server Management Studio, SQL Tips and Tricks, T SQL, Technology, Video

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