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  • No "redefinition of default parameter error" for class template member function?

    - by STingRaySC
    Why does the following give no compilation error?: // T.h template<class T> class X { public: void foo(int a = 42); }; // Main.cpp #include "T.h" #include <iostream> template<class T> void X<T>::foo(int a = 13) { std::cout << a << std::endl; } int main() { X<int> x; x.foo(); // prints 42 } It seems as though the 13 is just silently ignored by the compiler. Why is this? The cooky thing is that if the template declaration is in Main.cpp instead of a header file, I do indeed get the default parameter redefinition error. Now I know the compiler will complain about this if it were just an ordinary (non-template) function. What does the standard have to say about default parameters in class template member functions or function templates?

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  • Writing a windows web service and not sure what language to use?

    - by badpanda
    So I am required to write a fairly basic Windows service and have never done so before. Of C#, C++ (the Visual Studio suite), what is the best language to develop in? I am a student, and am most familiar with OO languages such as Java. Additionally, if anyone can recommend any books, articles, or google searches that would be relevant to the project I would greatly appreciate it. Thanks! badPanda

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  • How can I catch a change event from an HTML text field when a user clicks on a link after editing?

    - by Eric the Red
    Our webapp has a form with fields and values that change depending on values entered. Each time there is a change event on one of the form elements, we use an expensive AJAX call to update other elements on the page. This works great for selects, radio buttons and checkboxes. The issue comes in when a user adds content to a text field, and then clicks a link without taking the focus from the text field. The browser moves to a new page, and the contents of the text field are never saved. Is there an easy way to code around this? The AJAX call is too expensive to call with each key press. Here's an example of my Prototype code at the moment: $$('.productOption input.text').invoke('observe', 'change', saveChangeEvent);

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  • jquery: How can I trigger click() without editing the element state?

    - by user280381
    I need to trigger a click function assigned to a checkbox, but without actually changing it's checked state (which click() does). Scenario: I have a form with several checkboxes that when selected reveal a textarea. This works fine, but I also need to call the click() function on $(document).ready() My code is below, please note I have very limited access to changing the generated html. I have an object (admin_panels) which will store each checkbox and the texarea it should bring up. var admin_panels = {"checkbox-id" : "textarea-id"}; $(document).ready(function(){ for (var elem in admin_panels) { $("#" + elem).click(admin_slide); // $("#" + elem).click(); } }) function admin_slide() { if ($(this).is(":checked")) { $("#" + admin_panels[this.id] + "-wrapper").slideDown(); }else{ $("#" + admin_panels[this.id] + "-wrapper").slideUp(); } } Thanks

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  • How do I avoid nesting forms when offering inline editing of lists with checkboxes for mass updates.

    - by adam
    A lot of sites offer the ability to edit lists of items inline as well as allowing multiple items to be selected via checkboxes and have an action performed all at once e.g. delete, mark as spam etc. But how do you implement this without violating html rules. I need one form for the checkboxes with individual submit_tags for the mass actions. But after a user clicks on an item in the list, another form via Ajax will be inserted within the checkbox form. How do I avoid doing this? I'm using rails and jQuery.

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  • Yet another list comprehension question

    - by relima
    I had this: if Setting["Language"] == "en": f.m_radioBox3.SetSelection(0) elif Setting["Language"] == "pt": f.m_radioBox3.SetSelection(1) elif Setting["Language"] == "fr": f.m_radioBox3.SetSelection(2) elif Setting["Language"] == "es": f.m_radioBox3.SetSelection(3) Then I did this: Linguas = ["en","pt","fr","es"] a = 0 for i in Linguas: if i == Setting["Language"]: f.m_radioBox3.SetSelection(a) a += 1 Is it possible to further simplify this and make it into a one-liner?

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  • Can I set NHibernate's default "OrderBy" to be "CreatedDate" not "Id"?

    - by Chris F
    This is an oddball question I figure. Can I get NHibernate to ask SQL to sort data by CreatedDate by default unless I set an OrderBy in my HQL or Criteria? I'm interested in knowing whether this sort can be accomplished at the DB level to avoid bringing in LINQ. The reason is that I use GUIDs for Ids and when I do something like this: Sheet sheet = sheetRepository.Get(_someGUID); IList<SheetLineItems> lineItems = sheet.LineItems; to fetch all of the lineItems, they come back in whatever arbitrary way that SQL sorts that fetch, which I figure is GUID. At some point I'll add ordinals to my line items, but for now, I just want to use CreatedDate as the sort criteria. I don't want to be forced to do: IList<SheetLineItem> lineItems = sheetLineItemRepository.GetAll(_sheetGUID); and then writing that method to sort by CreatedDate. I figure if everything is just sorted on CreatedDate by default, that would be fine, unless specifically requested otherwise.

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  • Retrieve nested list from XDocument with LINQ

    - by twreid
    Ok I want my link query to return a list of users. Below is the XML <section type="Users"> <User type="WorkerProcessUser"> <default property="UserName" value="Main"/> <default property="Password" value=""/> <default property="Description" value=""/> <default property="Group" value=""/> </User> <User type="AnonymousUser"> <default property="UserName" value="Second"/> <default property="Password" value=""/> <default property="Description" value=""/> <default property="Group" value=""/> </User> </section> And my current LINQ Query that doesn't work. doc is an XDocument var users = (from iis in doc.Descendants("section") where iis.Attribute("type").Value == "Users" from user in iis.Elements("User") from prop in user.Descendants("default") select new { Type = user.Attribute("type").Value, UserName = prop.Attribute("UserName").Value }); This does not work can anyone tell me what I need to fix? Here is my second attempt after fixing for the wrong property name. However this one does not seem to enumerate the UserName value for me when I try to use it or at least when I try to write it to the console. Also this returns 8 total results I should only have 2 results as I only have 2 users. (from iis in doc.Descendants("section") where iis.Attribute("type").Value == "Users" from user in iis.Elements("User") from prop in user.Descendants("default") select new { Type = user.Attribute("type").Value, UserName = (from name in prop.Attributes("property") where name.Value == "UserName" select name.NextAttribute.Value).ToString() });

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  • phpMyAdmin "No database selected" MySQL

    - by user1751660
    I downloaded a MySQL backup file and promptly imported into MAMP's phpMyAdmin. I got this return: Error SQL query: -- -- Database: `mysql` -- -- -------------------------------------------------------- -- -- Table structure for table `columns_priv` -- CREATE TABLE IF NOT EXISTS `columns_priv` ( `Host` CHAR( 60 ) COLLATE utf8_bin NOT NULL DEFAULT '', `Db` CHAR( 64 ) COLLATE utf8_bin NOT NULL DEFAULT '', `User` CHAR( 16 ) COLLATE utf8_bin NOT NULL DEFAULT '', `Table_name` CHAR( 64 ) COLLATE utf8_bin NOT NULL DEFAULT '', `Column_name` CHAR( 64 ) COLLATE utf8_bin NOT NULL DEFAULT '', `Timestamp` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP , `Column_priv` SET( 'Select', 'Insert', 'Update', 'References' ) CHARACTER SET utf8 NOT NULL DEFAULT '', PRIMARY KEY ( `Host` , `Db` , `User` , `Table_name` , `Column_name` ) ) ENGINE = MYISAM DEFAULT CHARSET = utf8 COLLATE = utf8_bin COMMENT = 'Column privileges'; MySQL said: #1046 - No database selected I did not alter the .sql file at all. Any hints on how i can get this puppy going locally? Thanks!

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  • How can I give some basic text editing functionality to a firefox plugin?

    - by roddik
    Hello. I'm writing a plugin to Firefox, which is basically a sidebar, that is filled with yaml-formatted information based on what user does on the page (just another web testing solution). I want to enable user to change generated text manually right in the sidebar and: Add code-folding (folding click: \n text: some text to a single line) Add highlighting of registered actions (click, fill and so on) and unregistered actions (syntax errors) How do I do that? Is placing an iframe to the sidebar and trying to do that with html/js the best solution (seen it in a similar one)? As you may have noticed, I'm a newbie in plugin writing, so please excuse if anything.

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  • Which ISO format should I use to store a user's language?

    - by John Himmelman
    Should I use ISO 639-1 (2-letter abbreviation) or ISO 639-2 (3 letter abbrv) to store the user's language? Both are official standards, but which is the de facto standard in the development community? I think ISO 639-1 would be easier to remember, and is probably more popular for that reason, but thats just a guess. The site I'm building will have a separate site for the US, Brazil, Russia, China, & the UK. http://en.wikipedia.org/wiki/ISO_639

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  • If i write in assembly or machine language, will the program work on any computer with a compatible processor?

    - by user663425
    Basically, i'm wanting to know if i can use either machine or assembly language to write a program that will work on any computer with an x86 processor, despite differences in operating systems. For example, you run a program and no matter what computer it's on, it'll display "Hello, World!" I know it's a little crazy to want to know either of these to languages, but i figure it's an incredible thing to learn, so why not?

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