methods

问题 I have a user model. I'm trying to set my user index view to show only those users who have completed an onboarding process. My approach to doing that is: index: <% Users.onboarded.each do |user| %> In my user.rb, I tried to define a scope, for onboarding, as: scope :onboarded, -> { where (:user_is_matchable?) } I have a method in my organisation service class which has: class UserOrganisationMapperService attr_accessor :user private def user_is_matchable? profile.present? && matching

问题 I'm trying to use threads for the first time on a method of my class. This is a simplified version of my code that results in the same error. #include <thread> #include <iostream> #include <memory> #include <vector> class Foo{ public: std::vector<int> DoThing() { return {1}; } std::vector<int> DoThingMultiThread(unsigned int threads) { std::vector<int> values; std::vector<std::thread> threadVec(threads); for (unsigned int i = 0; i < threads; ++i) { threadVec.at(i) = std::thread(&Foo:

问题 I'm running Ubuntu + PHP 5.4 and got such error: Strict Standards: Non-static method XTemplate::I() should not be called statically, assuming $this from incompatible context in ... on line 339 And that method looks like this: interface ITemplate { public function I(); } class XTemplate implements ITemplate { public function I() { ... } } And this code is running normal on Windows 7 in XAMPP. I have found only advices to turn off error_reporing, but I need to solve it. Do I need to install

问题 I'm working on a small personal project where I created many classes. Each class has its own register containing all its instances: class IterReg(type): # Register of all objects for iteration def __iter__(cls): return iter(cls._reg.values()) The "template" which I use for each class is class Point(object): # Point object __metaclass__ = IterReg _reg = dict() counter = 0 # Initialize def __init__(self, name): self.name = name self._reg[self.name] = self Point.counter += 1 # Return register

问题 I'm currently learning how to use genetic algorithms. However, I'm having difficulty with my method compareTo() . This method should compare the fitness values between two individuals. I've been trying to invoke my getFitness() method for it to be used in the compareTo() method, but I keep getting this error Cannot invoke getFitness() on the array type int[] I'm not sure where this error is coming from. Attached will be the mentioned methods and constructors, I will outline where this error

问题 I'm currently learning how to use genetic algorithms. However, I'm having difficulty with my method compareTo() . This method should compare the fitness values between two individuals. I've been trying to invoke my getFitness() method for it to be used in the compareTo() method, but I keep getting this error Cannot invoke getFitness() on the array type int[] I'm not sure where this error is coming from. Attached will be the mentioned methods and constructors, I will outline where this error

问题 If I have function names stored as strings in a Hashtable. Is there a way to access the functions via the stored strings? EDIT I'm afraid the platform that i'm working on CLDC1.1/MIDP2.0 does not support Reflection. Any workaround possible? 回答1: Just use a big long list of else-ifs: [...] } else if ("foo".equals(function)) { target. foo(); } else if ("bar".equals(function)) { target. bar(); [...] (Although I generally don't like attempting vertical alignments in source, I think in cases like

问题 I want to achieve method chaining in Java. How can I achieve it? Also let me know when to use it. public class Dialog { public Dialog() { } public void setTitle(String title) { //Logic to set title in dialog } public void setMessage(String message) { //Logic to set message } public void setPositiveButton() { //Logic to send button } } I want to create method chaining that I can use as follows: new Dialog().setTitle("Title1").setMessage("sample message").setPositiveButton(); or like new Dialog

问题 I want to achieve method chaining in Java. How can I achieve it? Also let me know when to use it. public class Dialog { public Dialog() { } public void setTitle(String title) { //Logic to set title in dialog } public void setMessage(String message) { //Logic to set message } public void setPositiveButton() { //Logic to send button } } I want to create method chaining that I can use as follows: new Dialog().setTitle("Title1").setMessage("sample message").setPositiveButton(); or like new Dialog

问题 This question already has answers here : What's the difference between a method and a function? (32 answers) Closed 5 years ago . Why functions are called methods in java. I am not asking the difference between the two. Why Java community choose to name them methods. Is there any concrete reason behind this decision or it's just a name? When i think of literal meaning as far as i could think function is related to internal working of some machine. Method is a way of working to achieve a goal