state

问题 I am trying to use session state in MVC and I have been stuck for the entire evening! I realise session state should be used sparingly in MVC - but I am sure I want to use it for this one page - so would appreciate solutions rather than opinions. Basically, I have a contact form with a CAPTCHA image. When the page loads I want to set the session to the characters used in the CAPTCH image (dynamically generated image). I have an 'new image' link which async creates a new code, sets the session

问题 I am working my way through SICP. I am on Section 3.1.1 and looking at local state. I am evaluating these exercises in GNU Guile v2.0.11. I did find a similar question about this section, but it seems not to address the point I am struggling with, or I am overly obtuse. The two examples I am looking at are these: (define new-withdraw (let ((balance 100)) (lambda (amount) (if (>= balance amount) (begin (set! balance (- balance amount)) balance) "Insufficient funds")))) (define (make-withdraw

问题 I need to be able to save/load state of this boost random generator: boost::variate_generator<boost::mt19937, boost::random::uniform_real_distribution<> > generator; I do it this way: std::ostringstream content; content << this->generator.engine(); The problem is, that this is incredibly slow, isn't there some alternative way to store it? (Or access the random generator data in native format). This code is encapsulated in our RandomGenerator class, so it can be little bit nasty. 回答1: A couple

问题 In order to send an argument from one screen to the other I have to set this argument as a field in the widgets class. With many arguments being passed down to several widgets I think this might cause a problem for bigger applications. What is the best way to pass data between screens efficiently? 回答1: Typically the best way is to use app state management. You edit the state before switching routes and read the state on the new screen. If done with persistence this also has the benefit of

问题 I have a little project which is very similar to implementing a Turing machine. The essential problem I have is to save the current configuration e.g. the position of the head and further information. Important to me is especially saving up the head position to move him forwards or backwards. What would be the Erlang way to solve this problem? I'm new to Erlang but as far as I explored OTP the gen_event behavior is suited for this. My thought was to pass over the initial head position and

问题 This code does not work as I expected. Could you please explain why? (defn make-str [s c] (let [my-str (ref s)] (dosync (alter my-str str c)))) (defn make-str-from-chars "make a string from a sequence of characters" ([chars] make-str-from-chars chars "") ([chars result] (if (== (count chars) 0) result (recur (drop 1 chars) (make-str result (take 1 chars)))))) Thank you! 回答1: You pass a sequence with one character in it to your make-str function, not the character itself. Using first instead

问题 I have this code: app.js var promptoWeb = angular.module('promptoWeb', ['ngMaterial', 'ngAnimate', 'ngMessages', 'ngAria', 'ui.router', 'ui.sortable', 'ngFileUpload']); (function (app) { app.factory('env', function () { var domain = {domain: "http://localhost:8860/Elton"}; return domain; }); app.config(['$stateProvider', '$urlRouterProvider', '$compileProvider', function ($stateProvider, $urlRouterProvider, $compileProvider) { self = this; $compileProvider.preAssignBindingsEnabled(true);

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . I'm using R and need some help. Background: I video-recorded participants in a behavioural study. I then coded different aspects of their behaviour from the videos so that I now have one data frame per participant. The df has many unordered factors, each representing the discrete

问题 i'm brand new to Flutter. I'm trying to open a panel pressing a button and than closing it by pressing a button on that panel. I've managed to do it by writing the code in the same page. What i can't do is splitting the code and keep everything working. What I'm actually doing is calling a variable in the State of a widget that is initialized False and then with an if statement i'm calling: or an empty container or the panel i want. When i press the button i call SetState(){} and the variable

问题 I am using the broadcast pattern to connect two streams and read data from one to another. The code looks like this case class Broadcast extends BroadCastProcessFunction[MyObject,(String,Double), MyObject]{ override def processBroadcastElement(in2: (String, Double), context: BroadcastProcessFunction[MyObject, (String, Double), MyObject]#Context, collector:Collector[MyObject]):Unit={ context.getBroadcastState(broadcastStateDescriptor).put(in2._1,in2._2) } override def processElement(obj: