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  • Why is overloading operator&() prohibited for classes stored in STL containers?

    - by sharptooth
    Suddenly in this article ("problem 2") I see a statement that C++ Standard prohibits using STL containers for storing elemants of class if that class has an overloaded operator&(). Having overloaded operator&() can indeed be problematic, but looks like a default "address-of" operator can be used easily through a set of dirty-looking casts that are used in boost::addressof() and are believed to be portable and standard-compilant. Why is having an overloaded operator&() prohibited for classes stored in STL containers while the boost::addressof() workaround exists?

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  • Twitter Search API is returning weird characters - is it more or is it them?

    - by DanSingerman
    We are building an app that accesses the Twitter search over JSONP. It mostly works fine, but occasionally the request returns a JSONP callback that exists of weird unparseable characters. Here is an example: http://search.twitter.com/search.json?result_type=recent&rpp=100&geocode=51.4375857,-0.1658648,1km&page=5&callback=jsonp1272532482854 (If you change page=5 to a value less than 5 in the URL it works fine) So Am I doing something wrong? Can anyone suggest a workaround?

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  • How to call user define function when excel sheet being opened

    - by Nimo
    Hi, I'm trying to call a function when a workbook is being opened. I used workbook_open() event. But I notice that before calling function which is inside workbook_open(), all the functions that already exists in the workbook are being called. How can I call my function to execute before calling any of functions in the workbook? Thank you

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  • How do you create a transaction that spans multiple statements in Python with MySQLdb?

    - by Fast Fish
    I know that with an InnoDB table, transactions are autocommit, however I understand that to mean for a single statement? For example, I want to check if a user exists in a table, and then if it doesn't, create it. However there lies a race condition. I believe using a transaction prior to doing the select, will ensure that the table remains untouched until the subsequent insert, and the transaction is committed. How can you do this with MySQLdb and Python?

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  • How to do 404 link testing through selenium rc for complete website?

    - by user1726460
    How can i verify a complete website's link(mostly links that are redirecting to 404 page) by using selenium Rc. Previously i tried to do this thong by using xenu and web link validator but in there results most of the links are showing 500 internal serevr error.and for the pages they are showing 500 internal server error the pages actuallt don't exists in the web site. So what is the concept if we can crawl through the website using selenium rc.?

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  • C++ for Ruby scripters

    - by Aaron Cohen
    I am a fairly capable Ruby scripter/programmer, but have been feeling pressure to branch out into C++. I haven't been able to find any sites along the lines of "C++ for Ruby Programmers". This site exists for Python (which is quite similar, I know). Does anyone know of a guide that can help me translate my Ruby 'thoughts' into C++?

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  • Data structures libaray in C

    - by Vineel Kumar Reddy
    Hi all I am very much used to .NET and java collection libraries and searching for a similar library in C. I am in need of following A list data structure for storing generic objects. and also a Dictionary data structure for key value pairs. Please let me know if any library exists. Thanks.

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  • ruby on rails ferret search:.only 10 records are getting from table

    - by jissy
    ruby on rails ferret search:.only 10 records are getting from table.For pagination i did it ,but only 10 records are getting even though there exists more records satisfying the search condition.if any of you know how to solve this,please reply. no limit is givenf it is not a ferret search all records are getting from table , and pagination is working the code is: @search_sd_ticket_result=ServiceDeskTicket.find_with_ferret(params[:sd_ticket][:servicedeskticket]).paginate :per_page =5, :page=params[:page]

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  • Project Euler 9 Understanding

    - by DMan
    This question states: A Pythagorean triplet is a set of three natural numbers, a b c, for which, a2 + b2 = c2 For example, 32 + 42 = 9 + 16 = 25 = 52. There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product abc. I'm not sure what's it trying to ask you. Are we trying to find a^2+b^2=c^2 and then plug those numbers into a+b+c=1000?

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  • HQL 'parsename' equivalent

    - by jaume
    I've discovered PARSENAME function as a good choice to order IP address stored in Database. Here there is an example. My issue is I'm using Hibernate with named queries in a xml mapping file and I am trying to avoid the use of session.createSQLQuery(..) function. I'm wondering if exists any PARSENAME equivalent function for HQL queries. I'm searching for it and cannot find anything. Many thanks.

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  • Problem with user login validation by authlogic

    - by Andrei
    Hi, I want to use email for signing in, and to allow users to have similar names. One way to do this is to rename login/username field to something different. However, I want to do it just by setting up authlogic. I tried the following acts_as_authentic do |c| c.login_field :email c.validate_login_field false c.validate_email_field true end but it still complains that the login already exists. What must be done to avoid username validation without renaming the field?

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  • Easy way to view images in a database

    - by Vaccano
    I have a web service that I just coded up that drops an image (png) into my SQL Server 2008 database as a varbinary. Is there a easy tool out there that can let me see that image? I could code up a client, but I would rather just use a tool if one exists.

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  • Algorithm to suggest a list of tags to users

    - by Itay Moav
    Given a free text, I need to analyse this this text and suggest a list of tags from a pre existing list. What algorithms are out there in the market? Can they handle a case where, for example, the text have a word like high cholesterol and I would like it so suggest heart disease although "high cholesterol" might not exists (initially) in the pre defined list.

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  • Problem with Copy-Item -force

    - by andemt
    Hi, This is part of my image-copy-script: Get-Childitem | where {$.Extension -eq ".png" -or $.Extension -eq ".gif" -or $_.Extension -eq ".jpg"} | Copy-Item -destination $dest -force It works fine, and it can overwrite files. Well, it can overwrite if the existing file have attribute R or A. Not when its blanked. Error in red text: "Copy-Item : The file '\server\d$\path\thumbs\007487l.jpg' already exists." Why?

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  • PostgreSQL, triggers, and concurrency to enforce a temporal key

    - by Hobbes
    I want to define a trigger in PostgreSQL to check that the inserted row, on a generic table, has the the property: "no other row exists with the same key in the same valid time" (the keys are sequenced keys). In fact, I has already implemented it. But since the trigger has to scan the entire table, now i'm wondering: is there a need for a table-level lock? Or this is managed someway by the PostgreSQL itself?

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  • Java portal architectural considerations

    - by Woot4Moo
    Currently there exists a need to create an application that will serve 5 different customers each requiring their own specific URL and content repository. My question is when designing this application what should my considerations be for protecting the content of the individual customers while meeting the requirements of the unique URL. The system will be sitting on Windows with a postgres database and java as the implementation language.

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  • General workflow to allow multiple OpenIDs to be associated with one app account

    - by BobTodd
    I have a (typical?) scenario: that my app's users can use multiple openids mapped to one app account (like stackoverflow). For me the unique thing on the account is the email address, so this binds openids to the profile. Question is, how to allow a user to start using a second openid once one is setup. I am asking as I have read that it is a security hole to allow automatic account openid syncing simply based on the provider-supplied email address as someone could easily spoof someone's email address to create a spoof openid and falsely access the account (how I am not sure) - although this seems to be exactly how stack operates. See options a. and b. below. Problem for me with a. is what happens if the original openid no longer works for whatever reason - how would you set-up a new openid? Would b. be more acceptable if we used email verification? Does anyone have an article detailing a "standard" way (set of user stories) for this - it seems to be an increasingly popular way to authenticate. I have tried to detail this in a rough decision tree... 1. My Site > authentication landing page - user chooses an openid (facebook, google, myopenid etc), redirection > 2. Provider site returns with token (includes user registering a new openid, logging in or is already logged in to Provider site) 3. My Site > use token id to lookup user 3.1 Profile exists? Yes > authenticate. ends. No > 3.1.1 was email address supplied by provider? Yes > lookup user by email address 3.1.1.1 Profile exists? Yes > a. error message - please login with existing openid and associate this openid (from special page) Yes > b. or associate this openid with existing profile automatically. authenticate. ends. No > Register profile. With registration email address follow 3.1.1, except this time where email is unique, we will associate openid. ends

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