global | 易学教程

Sharing a global facebook object across Android activities

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问题 I'm creating a global Facebook object (from android-facebook-sdk) to be able to share it across my activities: public class GlobalVars extends Application { public static final String APP_ID = "123456789"; public Facebook facebook = new Facebook(APP_ID); } In one of the activities I add the LoginButton, as shown in the examples: public class FacebookActivity extends Activity { private LoginButton mLoginButton; private Facebook mFacebook; private AsyncFacebookRunner mAsyncRunner; @Override

Is global synchronization in OpenCL possible?

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问题 As well known OpenCL barrier() function works only for single workgroup, and there is no direct possibility to synchronize workgroups. If it possible what's best approach for global synchronization today? Using atomics, OpenCL 2.0 features, etc.? Github links, examples are welcome! Thankx! 回答1: Global syncronization within a kernel is not possible. This is because work groups are not gauranteed to be run at the same time. You can achieve a sort of global sync in the host application if you

Why is it beneficial to rely on the scope chain alone and avoid explicitly referencing the head object in Javascript?

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问题 I've been reading this book "Javascript Enlightenment" by Cody Lindley. On page 82 he states: "Being explicit (e.g. window.alert() v.s. alert()) costs a little bit more with regards to performance. It's faster if you rely on the scope chain alone and avoid explicitly referencing the head object even if you know the property you want is contained in the global scope." I am kind of curious why this is. I would think that it would be the opposite, because the Javascript interpreter could just

PHP: “Global” Include

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问题 Current situation: I have the current version of my MVC Framework which uses classes as controllers. I have some "vintage" modules from my old MVC Framework which uses simple, flat includes as controllers. Much simplified that means: New Version: <?PHP class blaController extends baseController { private $intVar; function dosomethingFunction() { $this->intVar = 123; $this->view('myView'); } } ?> Old Version: <?PHP $globalVar = 123; // view "controllername" is automatically shown ?> I'm now

How to declare a variable for global use

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I've searched forum for similar issues and as I understand, global variables is to be avoided. For me that is not logical yet, as I'm new to programming. If I've understood all this correctly, a static variable should do the job that I'm looking for. I've made a combobox of four choices in the mainwindow and when a comboboxitem is selected, variable b is declared. This is done in a private void SelectionChanged. When the comboboxitem declaring variable b is selected, a usercontrol pops up. I want to use variable b further in my program, but I can't access it. I've tried to declare static int b

Javascript: variable scope & the evils of globals

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I'm trying to be good, I really am, but I can't see how to do it :) Any advice on how to not use a global here would be greatly appreciated. Let's call the global G. Function A Builds G by AJAX Function B Uses G Function C Calls B Called by numerous event handlers attached to DOM elements (type 1) Function D Calls B Called by numerous event handlers attached to DOM elements (type 2) I can't see how I can get around using a global here. The DOM elements (types 1 & 2) are created in other functions (E&F) which are unconnected with A. I don't want to add G to each event handler (because it's

Exceptions for the whole class

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问题 I'm writing a program in Python, and nearly every method im my class is written like this: def someMethod(self): try: #... except someException: #in case of exception, do something here #e.g display a dialog box to inform the user #that he has done something wrong As the class grows, it is a little bit annoying to write the same try-except block over and over. Is it possible to create some sort of 'global' exception for the whole class? What's the recommended way in Python to deal with this?

php global variable overhead in a framework

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问题 I'm currently developing a framework which uses an object of a Core class (this class has huge functionality & makes the framework working). The framework follows MVC architecture & has loosely coupled Model, Control, View classes. Theses classes need a reference to the Core class heavily. What I've done so far is: creating single object of the Core class & referencing to it by PHP keyword global in Model, Control, View classes. I don't like using this approach mainly because: This way is not

C++: Global variable as pointer

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I am new to c++ and have one question to global variables. I see in many examples that global variables are pointers with addresses of the heap. So the pointers are in the memory for global/static variables and the data behind the addresses is on the heap, right? Instead of this you can declare global (no-pointer) variables that are stored the data. So the data is stored in the memory for global/static variables and not on the heap. Has this solution any disadvantages over the first solution with the pointers and the heap? Edit: First solution: //global Sport *sport; //somewhere sport = new

How do global variables get initialized by the elf loader

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问题 For global variables in C like int aglobal = 5; When does the 5 get transferred into aglobal by the loader and how does it know to put 5 in aglobal. Same situation with a static declaration in a function. Like int afunc() { static int astatic = 8; return astatic; } 回答1: An int-sized space is made in a data section, with the value 5 encoded in it and a global non-function symbol named 'aglobal' is added to the symbol table pointing at it. References to aglobal are turned into relocations that