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• Why is the first four bytes of Java class file format is CAFEBABE?

  - by zengr

  Why is the first four bytes of Java class file format is CAFEBABE? Who named it? Your views/guesses? Source: IBM Java Programing Dynamics

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• Only static and const varibles can be assign to a class ??

  - by numerical25

  I am learning c++. Just curious, can only Static and constant varibles be assigned a value from within the class declaration ?? is this mainly why when you assign values to normal members, they have a special way doing it void myClass::Init():member1(0), member2(1) { }

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• PHP: how can a class reference its own name?

  - by Nathan Long

  In PHP, how can a class reference its own name? For example, what would the method look like to do this? Dog::sayOwnClassName(); //echos "Dog";

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• Log4j: How filter out messages from a specific class?

  - by BestPractices

  I want to configure my log4j logging to not log messages that are 1) coming from a specific class and 2) of a specific severity i.e. WARN. Can someone provide sample configuration/code on how to do this?

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• What is the most efficient way to populate class attributes with a row from a database query?

  - by ensnare

  Looking to have a database query set all the instance variables in a class: Example: def populate(self, if): #Perform mysql query self._name = row['name'] self._email = row['email'] ... What's the fastest way to do this? Or is this not recommended (with a better approach)? Thanks.

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• OOP: class based and prototype based, are there other alternatives?

  - by Gabriel Šcerbák

  I know of class-based and protype based object oriented programming languages, are there any other alternatives? What are they?

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• How can the AssemblyName class be used for existing Assemblies?

  - by IbrarMumtaz

  This is another exam related question. I want to know how can I use the AssemblyName class to represent an existing assembly that already exists on disk??? I am talking about from the perspective of using the AppDomain's instance method .Load(), that takes an AssemblyName object as a parameter. I know what MSDN has to say about what the .Load() method was designed for but that aside, I still want to know how to use it !!!

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• Is there any way to check for properties of a class for a particular value in c#

  - by Rohit

  I have a License class.There are 50 boolean properties and some timestamp properties. I want to inform user in case all of these 50 properties are false. One way is to use 50 if and if conditions.other way is reflection which seems overkill for this thing. Please suggest some other way. I am using .Net framework 3.5

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• What is the NetBeans keyboard shortcut for code generation for child class constructors?

  - by waiwai933

  I was coding in NetBeans (PHP) today, and my hand slipped while I was typing a constructor. It must have hit a keyboard shortcut, because a constructor that was designed for a child class appeared on my screen (i.e. it called the parent constructor, so it's not the Insert Code -> Constructor, I don't think). Does anyone know what the shortcut is?

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• What should my teacher talk about in my Advanced C++ class? [advice needed]

  - by Goose Bumper

  My teacher for Advanced C++ has opened the class up for students to suggest whatever topics we want. What are some good advanced C++ topics to know? We've already covered: template metaprogramming the STL (obviously) introduction to the boost libraries Please give reasons for suggestions as well.

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• How do I add a css class to the TempData output?

  - by Pete

  The TempData output is plain text and putting a div around it will leave a formatted but empty div on the screen if there is no TempData. Is there a way to apply a class to it so that it only shows when the TempData item is set? Other than writing the div code into the TempData, which seems like a horrible idea.

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• how to have two controller actions, one shared view for Zend_Controller_Action Class?

  - by arendn

  Hi Guys, How do you specify a custom view script for a given Controller Action method? For example: Class UserGalleryController extends Zend_Controller_Action { public function fooAction() { $this->view->actionMsg = 'foo'; // (uses foo.phtml automagically) } public function barAction() { $this->view->actionMsg = 'bar'; //use foo's view script ????? } } I basically want to have one view script (foo.phtml) Thanks :-)

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• Better way to write an object generator for an RAII template class?

  - by Dan

  I would like to write an object generator for a templated RAII class -- basically a function template to construct an object using type deduction of parameters so the types don't have to be specified explicitly. The problem I foresee is that the helper function that takes care of type deduction for me is going to return the object by value, which will result in a premature call to the RAII destructor when the copy is made. Perhaps C++0x move semantics could help but that's not an option for me. Anyone seen this problem before and have a good solution? This is what I have: template<typename T, typename U, typename V> class FooAdder { private: typedef OtherThing<T, U, V> Thing; Thing &thing_; int a_; // many other members public: FooAdder(Thing &thing, int a); ~FooAdder(); void foo(T t, U u); void bar(V v); }; The gist is that OtherThing has a horrible interface, and FooAdder is supposed to make it easier to use. The intended use is roughly like this: FooAdder(myThing, 2) .foo(3, 4) .foo(5, 6) .bar(7) .foo(8, 9); The FooAdder constructor initializes some internal data structures. The foo and bar methods populate those data structures. The ~FooAdder dtor wraps things up and calls a method on thing_, taking care of all the nastiness. That would work fine if FooAdder wasn't a template. But since it is, I would need to put the types in, more like this: FooAdder<Abc, Def, Ghi>(myThing, 2) ... That's annoying, because the types can be inferred based on myThing. So I would prefer to create a templated object generator, similar to std::make_pair, that will do the type deduction for me. Something like this: template<typename T, typename U, typename V> FooAdder<T, U, V> AddFoo(Thing &thing, int a) { return FooAdder<T, U, V>(thing, a); } That seems problematic: because it returns by value, the stack temporary object will be destructed, which will cause the RAII dtor to run prematurely. One thought I had was to give FooAdder a copy ctor with move semantics, kinda like std::auto_ptr. But I would like to do this without dynamic memory allocation, so I thought the copy ctor could set a flag within FooAdder indicating the dtor shouldn't do the wrap-up. Like this: FooAdder(FooAdder &rhs) // Note: rhs is not const : thing_(rhs.thing_) , a_(rhs.a_) , // etc... lots of other members, annoying. , moved(false) { rhs.moved = true; } ~FooAdder() { if (!moved) { // do whatever it would have done } } Seems clunky. Anyone got a better way?

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• How can I validate a "does not match" type using CodeIgniter's Form Validation class?

  - by Shamoon

  I want to ensure that a certain text field does not contain a specific value. Is there any way for me to do this using CI's Form Validation class or do I have to write my own extension for it?

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• Can g_time_out add be given a member function of a class?

  - by paultop6

  Hi Guys, The question is simply in the title, if i have a function i want to use via a g_timeout_add, but this function is a Class member function, is there any way i can use it with g_timeout_add? Regards Paul

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• Is it bad practice to 'mix class and interfaces in the same package'?

  - by DerMike

  Hello, I just found something that I never heard of before and I do not agree with (by now). In an (upvoted and not further commented) answer I read "why to mix class and interfaces in the same package" So I wonder, if there are reasons to separate Interfaces and implementations in Java. I know that we are not obliged to have all implementations in the package of the interface, but is it (sometimes) wise to have none there? Regards Mike [;-)

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• How do I add a decorator to a class in python?

  - by Timmy

  how do I add a function with a decorator to a class? i tryed def add_decorator( cls ): @dec def update(self): pass cls.update = update @dec did not to with update im to use this with @orm.reconstructor in sqlalchemy.

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• nonatomic property in model class when using NSOperationQueue (iPhone)?

  - by Andrew B.

  I have a custom model class with an NSMutableData ivar that will be accessed by custom NSOperation subclasses (using an NSOperationQueue). I think I can guarantee thread-safe access to the ivar from multiple NSOperations by using dependencies, and I can guarantee that I don't access the ivar from other code (say my main app thread) by waiting until the Q has finished all operations. Should I use a nonatomic property specification, or leave it atomic? Is there a significant impact on performance?

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• Where can I have an "official" documentation about the java class Secure Random Implementation ?

  - by Daniel kolos

  Hello, I'm finding informations about this CSPNRG online. I founded only one article from you on the javamex site, which told about the implementation of this class. So I'm asking you to lead me to some documentation on this. I am expecting a kind of fiable source... Thank you for eanswering me Sorry for my bad english, I'm french and not used to write in english

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• How do I apply the browser height to a CSS class?

  - by ChrisBenyamin

  You can read your browser dimensions with jQuerys $document.height or with simple JS via height: window.innerHeight || document.body.clientHeight. But how do I apply the value to a CSS class?

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• How do I change the parent class in ANTLR-3?

  - by etheros

  By default, a parser generated using ANTLR-3 extends from org.antlr.runtime.Parser. How do I have it extend my custom class instead?

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• How does one access this hash from an ActiveRecord class in the Rails console?

  - by randombits

  I have a simple hash I created to make it easier to do dictionary type lookups. For instance: class Numbers < ActiveRecord::Base MY_TYPES { one: => 1, two: => 2 } end Is it not possible in the rails console to access this hash via Numbers.MY_TYPES[:one]?

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• Where to use Inner Class in professional java developement life?

  - by abc

  Where to use Inner Class in professional java developement life? Please explain.. googling didn't wrk efficiently..

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• How do I add a method to the Form class in Windows Forms?

  - by bhaveshtarkhala

  I want to add a new method in Windows.Forms.Form class.. Please help how to do this if anyone knows..

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• Is using css class always a better idea to get rid of style overriding problems?

  - by metal-gear-solid

  Is using css .class in place of #id always a better idea to get rid of style overriding problems and iimportant? #content ul li a {font-size:10px} #content .demo ul li a {font-size:15px}

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