GHC complains about overlapping instances when in fact they are not
Instances are only matched by the instance head. So, for the purpose of overlapping or not, what you wrote is no better than instance ToAVector [] a instance ToAVector v a which is clearly overlapping. To argue another way: ... as [] does not match G.Vector [] a ... this...
Using an Array of Class Instances in multiple source files
You could get a pointer to the array. so int file "A" Object arr[5]; Object* GetArr(){ return &arr; } and file "B" #include "a.cpp" void DoSomething(){ Object* pArr = GetArr(); //use pArr } That may work for your situation. Good Luck...
How to open a JFrame that was previously hidden from another class?
what you have to do is when creating Frame 2 . you have to pass same reference of Frame 1 then inside frame 2 you can change the viability of Frame 1
Rails 4: new instance is created and saved to database but not displayed in view
ruby-on-rails,forms,ruby-on-rails-4,relational-database,instances
I'm not sure how or where is stored your "active calendar" information, you definitely need it. Make it a field for User, it's a good option. Then I would create an application controller method like def active_calendar # Assuming you have a method to return current logged in user current_user.try(:active_calendar)...
Understanding inheritance in practice. Printing values of an instance
python,class,inheritance,printing,instances
If Family is supposed to contain Agent objects, why does it inherit from Agent? Regardless, you never initialized the parent Agent object in the Family class's __init__, and according to your edit the get_money method is contained in the Agent class, so Family objects don't have a get_money method. To...
Can anyone help me with how to use interfaces?
java,oop,instantiation,minecraft,instances
I do agree that it would be a good idea to look at a tutorial, but I can give you a little start on the concept of Interfaces. Interfaces aren't actually classes that can be instantiated as objects. They don't contain any logic about how to do anything, all they...
How to Count Number of Instances of a Class
Since static variables initialized only once, and they're shared between all instances, you can: class MyClass { private static int counter; public MyClass() { //... counter++; } public static int getNumOfInstances() { return counter; } } Read more about static fields in the JLS - 8.3.1.1. static Fields: If a...
Typeclasses 101: GHC too “eager” to derive instance?
When you put a plain expression into ghci, it is basically trying to print it, so > p f is approximately the same as having the following in a file main :: IO () main = print $ p f As you pointed out, p f :: (C a) =>...
App Engine - Too many open instances
java,google-app-engine,scheduler,instances
The issue has been fixed by Google at 2014-05-09 10:15 (US Pacific Time). See Google App Engine Downtime Notify How we fixed the issue temporarily: Disable and re-enable the application inside the Application Settings. After doing this everything went back to normal. Since then we only saw instances spawning with...
Setting variable to an instance of an object in php
You are attempting to change the value of the parameter $Object inside the function and expecting that change to be visible after the function completes. PHP passes arguments by value by default, so you either need to Change the function to return the value it found, and change how you...
Add property to instance of instafeed.js?
javascript,if-statement,instances,instafeedjs
Your syntax is correct, but I think this is what you intended: feed.options.resolution = 'low_resolution'; In terms of JavaScript, the approach you had was totally valid. But the Instafeed.js library you mentioned stores all of the configuration values on a nested options property....
In Actionscript 3, how to create many instances of the same symbol?
arrays,actionscript-3,for-loop,instances
That's probably the right idea, your syntax is just a little off. Try this: var myArray:Array = []; for (var i:int = 0; i < 99;i++) { var mc:MC = new MC(); myArray[i] = mc; mc.x = i * 30 } AS3 style conventions: use lowerCamelCase for variable names, don't...
Output class instance variables
You can override ToString in the Person class and make it output however you want it to when you call ToString. There's an example here: http://msdn.microsoft.com/en-us/library/ms173154.aspx...
Java Get and then remove from a list
java,list,setter,getter,instances
Removing with listOfInstances.get(1).getArrayList().remove(1); is enough and valid. In order to demonstrate this, I've written a test code for you. I've just removed the second object's ArrayList's second String element, you can compare the initial and updated states; import java.util.ArrayList; import java.util.Arrays; public class TestQuestion { public static void main(String[] args)...
get out which class is instantiated [closed]
Either i couldn't express myself or there was a misunderstanding. (i am using the jade Framework) Anyways this was the piece of code i searched for: if (myAgent instanceof specificclass_A) { //Do anything i want } else if (myAgent instanceof specificclass_B) { //Do anything i want } ...
How to Run Python Instantiated Class methods
python,class,methods,command-line,instances
Add the following code to your file: if __name__ == '__main__': unittest.main() Then you'll be able to run your file simply as "python algo.py", and that will run your test. See here for more information on using the Python unittest framework....