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  • Correct order of overrides for a composite control based on an abstract one

    - by mattdwen
    I'm writing a set of C# composite web server controls for displaying dialog boxes. I want to have one abstract class which handles the basic layout and things like titles of the control, then have a set of derived ones which render child controls at a specific point. I forsee three distincts methods: renderOpeningHtml handled by the abstract class, renderCustomControls as done by the derived class, and renderClosingHtml by the abstract class again, except I can't figure the life cycle of a CompositeControl and what methods to use when.

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  • C++ type-checking at compile-time

    - by Masterofpsi
    Hi, all. I'm pretty new to C++, and I'm writing a small library (mostly for my own projects) in C++. In the process of designing a type hierarchy, I've run into the problem of defining the assignment operator. I've taken the basic approach that was eventually reached in this article, which is that for every class MyClass in a hierarchy derived from a class Base you define two assignment operators like so: class MyClass: public Base { public: MyClass& operator =(MyClass const& rhs); virtual MyClass& operator =(Base const& rhs); }; // automatically gets defined, so we make it call the virtual function below MyClass& MyClass::operator =(MyClass const& rhs); { return (*this = static_cast<Base const&>(rhs)); } MyClass& MyClass::operator =(Base const& rhs); { assert(typeid(rhs) == typeid(*this)); // assigning to different types is a logical error MyClass const& casted_rhs = dynamic_cast<MyClass const&>(rhs); try { // allocate new variables Base::operator =(rhs); } catch(...) { // delete the allocated variables throw; } // assign to member variables } The part I'm concerned with is the assertion for type equality. Since I'm writing a library, where assertions will presumably be compiled out of the final result, this has led me to go with a scheme that looks more like this: class MyClass: public Base { public: operator =(MyClass const& rhs); // etc virtual inline MyClass& operator =(Base const& rhs) { assert(typeid(rhs) == typeid(*this)); return this->set(static_cast<Base const&>(rhs)); } private: MyClass& set(Base const& rhs); // same basic thing }; But I've been wondering if I could check the types at compile-time. I looked into Boost.TypeTraits, and I came close by doing BOOST_MPL_ASSERT((boost::is_same<BOOST_TYPEOF(*this), BOOST_TYPEOF(rhs)>));, but since rhs is declared as a reference to the parent class and not the derived class, it choked. Now that I think about it, my reasoning seems silly -- I was hoping that since the function was inline, it would be able to check the actual parameters themselves, but of course the preprocessor always gets run before the compiler. But I was wondering if anyone knew of any other way I could enforce this kind of check at compile-time.

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  • += new EventHandler(Method) vs += Method

    - by mafutrct
    There are two basic ways to subscribe to an event: SomeEvent += new EventHandler<ArgType> (MyHandlerMethod); SomeEvent += MyHandlerMethod; What is the difference, and when should I chose one over the other? Edit: If it is the same, then why does VS default to the long version, cluttering the code? That makes no sense at all to me.

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  • replacing div content with a click using jquery

    - by Joel
    I see this question asked a lot in the related questions, but my need seems very simple compared to those examples, and sadly I'm just still too new at js to know what to remove...so at the risk of being THAT GUY, I'm going to ask my question... I'm trying to switch out the div contents in a box depending on the button pushed. Right now I have it working using the animatedcollapse.toggle function, but it doesn't look very good. I want to replace it with a basic fade in on click and fade in new content on next button. Basic idea: <div> <ul> <li><a href="this will fade in the first_div"></li> <li><a href="this will fade in the second_div"></li> <li><a href="this will fade in the third_div"></li> </ul> <div class="first_container"> <ul> <li>stuff</li> <li>stuff</li> <li>stuff</li> </ul> </div> <div class="second_container"> <ul> <li>stuff</li> <li>stuff</li> <li>stuff</li> </ul> </div> <div class="third_container"> <ul> <li>stuff</li> <li>stuff</li> <li>stuff</li> </ul> </div> </div> I've got everything working with the animated collapse, but it's just an ugly effect for this situation, so I want to change it out. Thanks! Joel

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  • highlight parent window text when spell checking from child window

    - by Bo Gusman
    I'm working on a simple spell checking app for a lecture that I'm giving. I've got the basic spell checking code working just fine using a child form and NHunspell - great lib, by the way. However, I'd like for the parent textbox to show the highlighted text for reference, and while I'm setting the SelectedText properties accordingly, the text is not highlighted in the parent. Canceling the child window and the parent text is highlighted. Anybody know how I can do this?

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  • Any good tutorials on using OAuth with Piston?

    - by Hank Gay
    I've looked at the relevant section of the Piston documentation, but it only seems to focus on how to turn it on, not what it would look like for clients or how to test it to verify it's working. The example only seems to use HTTP Basic and curl. Finally, Ned Batchelder's question makes it look like a tutorial is in order. Thanks.

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  • Writing a DBMS in Python

    - by Matt Luongo
    Hey guys, I'm working on a basic DBMS as a pet project and planning to prototype in Python. I figure there's a reason there are only a few Python databases, and my gut agrees that my favorite language will be too slow to act as an honest performing database, but I'm looking forward to using it to learn what I need quickly. Would someone please contradict me? Is Python as ill-suited right now for this sort of thing as I think?

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  • How can I output data from an attribute in eZ Publish?

    - by Steven
    I'm noob and need some basic 101. I need to display content from my "home" page. The page has the following attributes: Name Billboard Left column Center column Right column Bottom column Tags Currently I use {$module_result.content} which outputs everything on that page. But I only want to output the content from Billboard and Center column. How can I do this?

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  • Java Collections Sort not accepting comparator constructor with arg

    - by harmzl
    I'm getting a compiler error for this line: Collections.sort(terms, new QuerySorter_TFmaxIDF(myInteger)); My customized Comparator is pretty basic; here's the signature and constructor: public class QuerySorter_TFmaxIDF implements Comparator<Term>{ private int numberOfDocs; QuerySorter_TFmaxIDF(int n){ super(); numberOfDocs = n; } } Is there an error because I'm passing an argument into the Comparator? I need to pass an argument...

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  • Classic string manipulation interview questions?

    - by user189364
    Hi, I am scheduled to have an onsite interview so I am preparing few basic questions. According to the company profile, they are big on string manipulation questions. So far I have manually coded these functions: String length, copy, concat, remove white space Reverse Anagrams Palindrome Please can some can give me a list of more classic string questions which I can practice before going there?

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  • 8GB Compact Flash Corrupted, Boot Sector Lost ?

    - by robert
    I have an 8GB Kingston compact Flash, and when I insert it into my mac it says that card is unredable and ask me for initialization. If i open Utilty Disk it show a card of 2,2 TB Generic Comact Flash, if I try to initialize that it give me error: POSIX reports: impossible to allocate memory. How i can format that ? There's a way with fdisk or smt to get this card work ? Thanks

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  • Qt under Visual C++ 2010 Express

    - by Evil Spork
    I'm trying to build a basic Qt hello world inside visual studio. I got the moc step to work (i think), but I am at a loss as to how to pass this linker error.. 1>moc_mainwindow.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const QMainWindow::staticMetaObject" (?staticMetaObject@QMainWindow@@2UQMetaObject@@B) I've pleanty of googling but I am really at a loss.

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  • Do any clouds support SSD storage?

    - by taw
    I'm using Amazon cloud right now, and the biggest performance issue is horrible I/O performance. As long as something fits RAM it's fine - once it's too big it gets ridiculously slow (in many different scenarios). There are only so many ways one can avoid hitting disk - so the question is - does Amazon or some other cloud provide SSD option?

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  • How can I get the nickname and message from raw IRC data in vb.net

    - by Rob
    Well basically I've got a vb.net script connecting to IRC, and I'm working on making it a basic chat system, but I've run into a problem. Say I receive this: :[email protected] PRIVMSG #channel :message I want to grab specific information to output to the user. I want to grab nickname and message How can I go about doing this? I thought about using regex, but I can't figure out how to make regex grab message since there's nothing after it.

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  • using mod_auth_mysql and mod_auth together

    - by sirrobin
    is it possible to use a database and a flatfile to authenticate a user for a directory. for example, if the requested user is not found in the database, apache should check the flatfile via mod_auth for the user. this is my current .htaccess files AuthMYSQLEnable On AuthName "Restricted" AuthType Basic AuthGroupFile /dev/null AuthMySQLHost localhost AuthMySQLDB members AuthMySQLUser admin AuthMySQLPassword admin123 AuthMySQLUserTable members AuthMySQLNameField username AuthMySQLPasswordField password AuthMySQLPwEncryption md5 require valid-user

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  • Why does Samba/CIFS suck so badly. [closed]

    - by sean
    Seriously, machines refusing to save data because files THEY HAVE OPEN are locked BY THEMSELVES. Getting 200+ connections simultaneously takes it out despite a plethora of available disk and network bandwidth. You can't turn off CUPS you have to COMPILE WITHOUT IT. DFS support is completely broken and pretty much useless in the current state (as in DFS for load balancing, not replication). We should just move to NFS and find a DFS like namespace aggregator.

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  • Immutable values in F#

    - by rsteckly
    I'm just getting started in F# and have a basic question. Here's the code: let rec forLoop body times = if times <= 0 then () else body() forLoop body (times -1) I don't get the concept of how when you define a variable it is a value and immutable. Here, the value is changing in order to loop. How is that different from a variable in C#?

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  • JavaScript computer algebra system

    - by Jonas
    I am looking for a simple computer algebra system (cas) for JavaScript but I can't find anything with google. I only need basic functionality: simplify expressions to some canonic form. Ability to check if two expressions are the same, i.e., a(x+y) == ax+ay parse mathematical formulas. I want it to be able to read expressions like ax²+4x. solve simple equations etc. Do you know of such a library?

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  • ASP.NET - Add Reference of GAC is not possible ?

    - by csharpbaby
    I am new to ASP.NET having some basic doubts. 1) The public assemblies are deployed in GAC.Even when i go for "Add Reference ", I can not point to c:\windows\assembly ( i hope it is not possible) .Still i need to refer the assembly from ..\Bin folder of the source project ( custom assembly).Is there any consideration behind it? 2 ) Why exe is not allowed in GAC ?

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  • How to use C# with AIR?

    - by dotnetdev
    I have some basic experience in making Flex sites, but I think I have more use for Flex in making a desktop AIR application. Anyway, I was wondering if it is at least possible to use C# alongside Actionscript/AIR? I can't find any example of this. Also, can I use custom Flash components in a Flex app? I know I can use Javascript components. Thanks

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  • Mandatory Embedded schema field not throwing excepiton when empty in SDL Tridion 2011

    - by user1733557
    I am pulling back to the basic schema questions in Tridion 2011. I have an embedded schema with three optional fields and I referred this schema in a content schema and marked it as mandatory. When I create a component and save it without entering data to this mandatory field; CME is not throwing any exception and proceeds with saving. Please let me know if there are any patches to resolve this issue. Thanks in advance.

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