global-variables

问题 I don't understand why i can't affect my global variable. I don't understand why this doesn't work.. I believe that it has to do with SDK.REST.retriveMultipleRecords, but i dont understand how. As you can see in first alert it works. but in 2nd it shows as "Undefined". In this fiddle, i have a simple example about defining a global variable and it works. Can anyone help with this issue? Why it is not affecting my globalVar? Players = new Array(); //GLOBAL VAR function setPlayers(topNumber){

问题 I have a multiprocessing program where I'm unable to work with global variables. I have a program which starts like this:- from multiprocessing import Process ,Pool print ("Initializing") someList = [] ... ... ... Which means I have someList variables which get initialized before my main is called. Later on in the code someList is set to some value and then I create 4 processes to process it pool = Pool(4) combinedResult = pool.map(processFn, someList) pool.close() pool.join() Before spawning

问题 I'm currently building an ASP.Net MVC 4 SAAS application (C#) and am stuck on designing the plans. I mean if a customer picks Plan A they should have access to some things and if they pick Plan B they get access to others and so on. The Part that I'm stuck on is be best practice of sharing the account's plan with all of the actions. I realize having global variables are bad practice and all but I really don't want to take round trips to the DB to get the plan on every action. What I'm

问题 I am given to believe that random number generators (RNGs) should only be seeded once to ensure that the distribution of results is as intended. I am writing a Monte Carlo simulation in C++ which consists of a main function ("A") calling another function ("B") several times, where a large quantity of random numbers is generated in B. Currently, I am doing the following in B: void B(){ std::array<int, std::mt19937::state_size> seed_data; std::random_device r; std::generate(seed_data.begin(),

问题 Is there a way to prevent a function from using global variables like document , window , navigator , and other declared global functions ? EDIT1: And if I could choose which global objects that are restricted it would be great, because I would like to allow the function to use for an example the Math object and it's functions... 回答1: Is there a way to prevent a function from using global variables like document, window, navigator, and other declared global functions? No, unless... The only

问题 I want to be able to open a .txt file up into a richtextbox in c# and also into a global variable i have made called 'notes' but don't know how to do this. This is the code i have at the moment: OpenFileDialog opentext = new OpenFileDialog(); if (opentext.ShowDialog() == DialogResult.OK) { richTextBox1.Text = opentext.FileName; Globals.notes = opentext.FileName; } Only problem is it doesn't appear in neither the richtextbox nor in the global varibale, and the global allows it to be viewed in

问题 From the following stackoverflow answer, the user says: It means that the variable is local to a translation unit (simply put, to a single source file), and cannot be accessed from outside it. This use of static is in fact deprecated in the current C++ Standard - instead you are supposed to use anonymous namespaces: static int x = 0; should be: namespace { int x = 0; } I don't disagree that anonymous namespaces are the preferred method, but is using static really deprecated now? Where does

问题 Does using lots of global variables in C code decrease or increase performance, when compiled for an ARM7 embedded platform? The code base consists of multiple C source code files which refer each other's global variables using the extern keyword. Different functions from different source code files refer to different global variables. Some of the variables are arrays. The compiler I'm using is IAR's EW ARM kickstart edition (32kb). 回答1: This will always decrease performance and increase

问题 In one of the answers in Tips for golfing in C, I saw this code (ungolfed version): s[],t; main(c){ for(scanf("%*d "); ~(c=getchar()); s[t++]=c) putchar(s[t]); } I think that the above program exhibits UB (but who cares in code golf?). But the thing that I don't understand is the s[] in global scope. I know that when the type of a global variable isn't specified, it defaults to int . I created a small program which surprisingly compiles: #include <stdio.h> int s[]; int main(void) { printf(

问题 ok guys, I have had a last post about the question variables and jquery: how capture value and use them (part 3) . You can find other questions about looking for variables and jquery: how capture value and use them (part 1) and variables and jquery: how capture value and use them (part 2) . I had to do: 1. capture a value from an ul-li list; 2. insert it into a global variable ( not has been successful ); 3. use this variable for another click function. Now I present my solution code (with