global-variables

问题 I have created a system that automatically registers function objects (functors) into a map based on the constructor of an global instance. In each cpp file that defines the functor, there's a global instance of the registrar class instance to register the functor to a singleton std::map<int, std::function<...> > object. This is the definition of registrar class: template < typename map_type, typename handler_type > struct registrar { registrar ( map_type& map_object, boost::uint16_t cmd_code

问题 One thing that has driven me nuts about SharePoint2007 is the apparent inability to have defineable settings that apply specifically to a site or site collection itself, and not the content. I mean, you have some pre-defined settings like the Site Logo, the Site Name, and various other things, but there doesn't appear to be anywhere to add new kinds of settings. The application I am working on needs to be able to create multiple kinds of "project site collections" that all follow a basic

问题 I have two views with their own .h and .m files of course. How can I declare a bool (or any variable for that matter) in one view and be bale to access it in another view? Thanks. 回答1: Objective C is a superset of plain ANSI C, so you would create and use global variables exactly the same way as in old-fashioned C. In exactly one .m or .c file, put: BOOL gMyGlobalBoolVar = NO; // or YES, depending on whatever initial state is needed I might place these in a centralized singleton class, such

问题 I'm developing a package in R. I have a bunch of functions, some of them need some global variables. How do I manage global variables in packages? I've read something about environment, but I do not understand how it will work, of if this even is the way to go about the things. 回答1: In general global variables are evil . The underlying principle why they are evil is that you want to minimize the interconnections in your package. These interconnections often cause functions to have side

问题 I'm developing a package in R. I have a bunch of functions, some of them need some global variables. How do I manage global variables in packages? I've read something about environment, but I do not understand how it will work, of if this even is the way to go about the things. 回答1: In general global variables are evil . The underlying principle why they are evil is that you want to minimize the interconnections in your package. These interconnections often cause functions to have side

问题 Context: I have an element with innerText in Page1 and another element with innerText on Page 2. And I need to compare these two values in Page 3. So I need to find a way to save these values in a variable globally so that they can be used later. Things I tried: Trial 1: Didn't work as page1value scope is limited to the cy.get() cy.get('#selector').invoke('text').then(text => { const page1value = text }) Trial 2: Didn't work as whenever I try to print the value outside, it comes as undefined

问题 This question already has answers here : Why are global and static variables initialized to their default values? (5 answers) Closed 3 years ago . #include <stdio.h> int a[100]; int main(){ printf("%d",a[5]); return 0; } Does the above code always print '0' or is it compiler specific? I'm using gcc compiler and I got the output as '0'. 回答1: Yes, all members of a are guaranteed to be initialised to 0. From section 3.5.7 of the C89 standard If an object that has static storage duration is not

问题 I'm quite new to Python and was having some confusing issues. I have two scripts main.py and second.py . I have a base url that needs to be changed in the second.py see bellow example def getVarientStock(self, sku,base="http://www.baseurl.com"): urlVariantStock = base + '/Product-GetVariants?pid=' + sku r = requests.get(urlVariantStock, headers=self.headers) try: versions = json.loads(r.text)['variations']['variants'] except: if r.status_code == 404: return {'error' : '"' + self.sku + '" is

问题 I have a to access the config variables defined in the file called test.js which has -- var aws = require('aws-sdk'); exports.connect = function(){ return aws; } Now I need to access it when the OnClick event occurs on the browser. I have this script but the require module does not work. clientScript.js var aws = require('../scripts/test.js').connect(); function getValue() { aws.describe({},function(){...}) } How can I access this aws variable? 回答1: You can't use require() on the client side,

问题 I have the following in my code /** * The primary database connection object * * @global object $GLOBALS['db'] * @name $db */ global $db; Now you would think that this would be sufficient, but when I run phpdoc, there is no mention of this variable anywhere in the documentation or any other global variable. What gives? This is straight out of the documentation. Why isn't it recognizing and recording this variable as a global? As a secondary question, it seems you ought to be able to reference