scope

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed last year . In julia 1.0.0, I get the following for-loop scoping behavior: julia> counts = 0 0 julia> for i in 1:10 counts += 1 end ERROR: UndefVarError: counts not defined I found the solution was to make the counts variable global inside the for loop. julia> for i in 1:10 global counts +

问题 I want to define a variable in php with in a global scope. That variable should be accessible for each user, so it should not depend on the session. I want to do something like the following: I have a php script, and that script usually takes about 5 to 15 minutes to execute, but it can take more than one hour in some special cases. This script is being run using a cron job with a 15 minutes interval. This script can also be run manually by any user. Now it's possible to run any number of

问题 I want to define a variable in php with in a global scope. That variable should be accessible for each user, so it should not depend on the session. I want to do something like the following: I have a php script, and that script usually takes about 5 to 15 minutes to execute, but it can take more than one hour in some special cases. This script is being run using a cron job with a 15 minutes interval. This script can also be run manually by any user. Now it's possible to run any number of

问题 What is the scope of a pragma directive? For example, if I say #pragma warning(disable: 4996) in a header file A that is included from a different file B, will that also disable all those warnings inside B? Or should I enable the warning at the end of file A again? 回答1: It is till the end of the translation unit. Informally, a TU is the source file with its include files. The usual pattern is this: #pragma warning (push) //save #pragma warning (disable: xxxx) #pragma warning (disable: yyyy) .

问题 Ive got a method that use to work by checking the first three letters/numbers and making sure they are the same before it continues like so def combineProcess(request): carID1 = request.POST['carID1'] carID2 = request.POST['carID2'] for x in range (0,3): a += carID1.length(x) b += carID2.length(x) if a.equals(b): //do something before it use to work now it stopped and i get this error. Exception Type: UnboundLocalError Exception Value: local variable 'a' referenced before assignment which i

问题 Ive got a method that use to work by checking the first three letters/numbers and making sure they are the same before it continues like so def combineProcess(request): carID1 = request.POST['carID1'] carID2 = request.POST['carID2'] for x in range (0,3): a += carID1.length(x) b += carID2.length(x) if a.equals(b): //do something before it use to work now it stopped and i get this error. Exception Type: UnboundLocalError Exception Value: local variable 'a' referenced before assignment which i

问题 Ive got a method that use to work by checking the first three letters/numbers and making sure they are the same before it continues like so def combineProcess(request): carID1 = request.POST['carID1'] carID2 = request.POST['carID2'] for x in range (0,3): a += carID1.length(x) b += carID2.length(x) if a.equals(b): //do something before it use to work now it stopped and i get this error. Exception Type: UnboundLocalError Exception Value: local variable 'a' referenced before assignment which i

问题 Is there any way to access an outer method from inside a class? For example: Using a .haml file ( therefore inside class Haml::Engine ), have a class Tumblr defined, with a method self.render . Outside of the Tumblr class, #haml_concat functions perfectly, but returns a NameError inside Tumblr . #haml_concat is defined in Haml::Helpers . Why is #haml_concat unusable inside Tumblr ? value = 42 class TestClass def test_method value end end TestClass.new.value # should ideally return 42 Right

问题 Let's say I have the following code block: int version; String content; synchronized (foo) { version = foo.getVersion(); content = foo.getContent(); } // Do something with version and content Its purpose is to grab a thread-safe consistent view of the version and content of some object foo. Is there a way to write it more concisely to look more like this? synchronized (foo) { int version = foo.getVersion(); String content = foo.getContent(); } // Do something with version and content The

问题 In this question: What do conditionals do to polymorphic objects in C++? (inclusion polymorphism) I have a situation where a parent pointer is pointing at one of two possible objects determined by the preceding conditional statement. Here is the code: (Reposted with solution) ClassParent *parentPointer; //Declare pointer to parent if (condition) { ClassChild1* mychild = new mychild1(); //Initialize ClassChild1 object with pointer mychild parentPointer = mychild;//Parent pointer points to