globals

问题 I am trying to use a global in a file that is just used to post data to. The global is not being registered on that page. How can I get the globals accessible in that page. EDIT maybe I wasnt too clear so let me clear it up. I have these files index.php global $user; echo $user->uid; post.php global $user; echo $user->uid; now from index.php I am posting to post.php through jquery. However when I echo $user->uid from post.php it is not echoing but when I echo it from index.php it is showing

问题 Mostly for my own edification I'm trying to list all of the global variables loaded in the current Emacs session. What I was thinking about doing is producing an HTML file with all of the functions listed. Of course, what would also be useful is the file where the function, var, etc was defined. Is there anything already built into emacs to help? L- 回答1: Something along these lines should do: (let ((result '())) (mapatoms (lambda (x) (when (boundp x) (let ((file (ignore-errors (find-lisp

问题 I noticed Interspire Shopping Cart initializes a lot of it's classes to a PHP's $GLOBALS variable. Is there any performance or security issues when doing this? Below is a fake file but written similar to that of Interspire Shopping Cart's. <?php // account.php $GLOBALS['USER_ACCOUNT'] = new USER_ACCOUNT(); $GLOBALS['USER_ACCOUNT']->createPage(); //creating the page ?> I have noticed that within the process of creating the page (see above) other files that get included will need access to the

问题 I want to modify some classes in the standard library to use a different set of globals the ones that other classes in that module use. Example This example is an example only: # module_a.py my_global = [] class A: def __init__(self): my_global.append(self) class B: def __init__(self): my_global.append(self) In this example, If I create an instance of A , via A() , it will call append on the object named by my_global . But now I wish to create a new module, import B to it, and have B use my

问题 Why would I want to overload a C++ operator() as global and not member function. For example, the == operator. Why is this done? for example in STL libraries. 回答1: The usual rule is for operators which modify the left hand object to be members, and binary operators which return a new object to be free functions; the main motivation for the latter is because the compiler will not convert the left hand side to match a member; if your class supports any implicit conversions, then all of the

问题 Why would I want to overload a C++ operator() as global and not member function. For example, the == operator. Why is this done? for example in STL libraries. 回答1: The usual rule is for operators which modify the left hand object to be members, and binary operators which return a new object to be free functions; the main motivation for the latter is because the compiler will not convert the left hand side to match a member; if your class supports any implicit conversions, then all of the

问题 Hypothetical situation: I'm running a complex site in php, and i use a lot of global variables. i could store the variables in an existing global scope, say $_REQUEST['userInfo'] , $_REQUEST['foo'] , and $_REQUEST['bar'] etc. and put a lot of different things into the request scope (which would be appropriate use, as these data refer to the request itself). or i could keep using lines like global $userInfo, $foo, $bar; in most of my functions. is there a performance hit, or a difference in

问题 I have a script called jobrunner.py that calls class methods in main.py. See below... # jobrunner.py from multiprocessing import Process import main from main import BBOX def _a(arg): f = main.a() print f.run() def _b(arg): p = main.b() print p.run() if __name__ == '__main__': world = '-180,180,-90,90' BBOX.append(world.split(',')) p1 = Process(target=_a, args=("1",)) p2 = Process(target=_b, args=("1",)) p1.start() p2.start() p1.join() p2.join() Processes _a and _b are invoked without any

问题 I have a iPhone application with a few custom-defined colors for my theme. Since these colors will be fixed for my UI, I would like to define the colors in a class to be included (Constants.h and Constants.m). How do I do that? (Simply defining them does not work because UIColors are mutable, and would cause errors - Initalizer not constant). /* Constants.h */ extern UIColor *test; /* Constants.m */ UIColor *test = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0]; Thanks! 回答1: A

问题 When I use the word extern before a method or variable declaration, am I making it global and therefore readable/writable/usable over the entire project ? If I use extern before a keyword, is there any chance it is still not accessible by part of my project ? For example, only by subclasses.. such as when I use "protected". extern is a C keyword, right? Is there an equivalent in Objective-C? I actually don't understand why they use a C keyword in an Objective-C project. thanks 回答1: 1) you're