global-variables

问题 I have a module in file global.jl which defines a global multidimensional array named "data": module Global export data # GLOBAL DATA ARRAY data = zeros(Int32, 20, 12, 31, 24, 60, 5); end I have a main.jl which uses this global variable: include("global.jl") using .Global println(data[14,1,15,18,0,1]) And I get the following error: $ time /usr/local/julia-1.2.0/bin/julia main.jl ERROR: LoadError: BoundsError: attempt to access 20Ã12Ã31Ã24Ã60Ã5 Array{Int32,6} at index [14, 1, 15, 18, 0, 1]

问题 This is one of those situations where I feel like there is a simple answer right in front of me...hopefully you guys/gals can show me the light. PROBLEM : I have a client that wants to maintain a query string across all pages on their site, only if they arrived at the site via a link that contains the query string. This query string would also need to be passed with any external link from the site. INFORMATION : An example of the query string : ?utm_medium=<ad_placement>&utm_source=<ad_source

问题 This is one of those situations where I feel like there is a simple answer right in front of me...hopefully you guys/gals can show me the light. PROBLEM : I have a client that wants to maintain a query string across all pages on their site, only if they arrived at the site via a link that contains the query string. This query string would also need to be passed with any external link from the site. INFORMATION : An example of the query string : ?utm_medium=<ad_placement>&utm_source=<ad_source

问题 How do i detect or capture change of value of a global variable in python variable = 10 print(variable) variable = 20 # Detect changes to the value using a signal to trigger a function UPDATE AST docs - GOOD INTRO https://greentreesnakes.readthedocs.io/en/latest/ 回答1: To my knowledge, it is not possible to generically capture the assignment of a global symbol in Python (At least in CPython where globals are stored in a dict in the module object, both are C types that cannot be monkey patched)

问题 I want to define global array (used in other functions) based on input from main(); (concretely array size). The extern keyword didn't help. #include <iostream> using namespace std; void gen_sieve_primes(void); int main() { int MaxNum; cin >> MaxNum; int *primes = new int[MaxNum]; delete[] primes; return 0; } //functions where variable MaxNum is used 回答1: You declare it outside of main: int maxNum; int main() { ... } Ideally, you don't do this at all. Globals are rarely useful, and hardly

问题 What is the reason of having globals() function in Python? It only returns dictionary of global variables, which are already global, so they can be used anywhere... I'm asking only out of curiosity, trying to learn python. def F(): global x x = 1 def G(): print(globals()["x"]) #will return value of global 'x', which is 1 def H(): print(x) #will also return value of global 'x', which, also, is 1 F() G() H() I can't really see the point here? Only time I would need it, was if I had local and

问题 What is the reason of having globals() function in Python? It only returns dictionary of global variables, which are already global, so they can be used anywhere... I'm asking only out of curiosity, trying to learn python. def F(): global x x = 1 def G(): print(globals()["x"]) #will return value of global 'x', which is 1 def H(): print(x) #will also return value of global 'x', which, also, is 1 F() G() H() I can't really see the point here? Only time I would need it, was if I had local and

问题 I need to use the order array in another class ( AddOrderVievContoller.swift class) class OrderListViewController: UITableViewController { var orders: [Order] = [] error message in AddOrderVievContoller.swift class: use of unresolved indentifier 'orders' if results != nil { orders = results as! [Order] } 回答1: Create a global variable: public var orders = [String]() place this in-between the modules your importing ( import UIKit ) and the class definition: import UIKit public var orders =

问题 First let me preface my question with an apology if this has been answered somewhere else. I reviewed a few of the questions Stack Overflow suggested, but none of them contained the answer I'm looking for. I am also more interested in why this is happening than any workarounds to avoid the problem. I tried answering my own question, but I was only able to reduce the problem to a simpler one. Anyway, can someone please help me understand the difference between the two sets of code below that

问题 Suppose a I have a *.c file with a global variable ("global" in the sense that it has file scope) and a function. Can the function return that variable as a value to be used in other translation units? I assume the answer is "yes." If nothing else, I assume that in C return operates under "copy" semantics---the value of the return expression is returned. But I'm not sure. 回答1: Yes. And you're correct: if you return something like an int , then you'll return a copy of its current. If you