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by: Dave |
last post by:
Hello all,
After perusing the Standard, I believe it is true to say that once you
insert an element into a std::list<>, its location in memory never changes.
This makes a std::list<> ideal for storing vertices of an arbitrary n-ary
tree where a vertex contain pointers to its parent / children. These parent
/ child vertices need to stay put if we've got pointers to them somewhere!
Am I correct in my assertion?
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by: matty.hall |
last post by:
I have two classes: a base class (BaseClass) and a class deriving from
it (DerivedClass). I have a List<DerivedClass> that for various
reasons needs to be of that type, and not a List<BaseClass>. However, I
need to cast that list to a List<BaseClass> and it is not working. The
code is below. I get the following exception:
"Unable to cast object of type 'System.Collections.Generic.List`1' to
type 'System.Collections.Generic.List`1'."
...
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by: Brian Pelton |
last post by:
I am not sure how to fix this problem I've stumbled into...
I have a list<> of an interface type. I need to pass that list to a
method that adds more objects to the list.
But, eventually, I need to get back to the original list<> object.
---
In other words; let's say I start with an List<> of 3 objects. I call a
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by: Varangian |
last post by:
Hello, there
I have a problem with regards to System.Collections.Generic.List<T>
I need to pass a class with implements an interface - TestClass :
IPerson
I put this class in a List<TestClass> = new List<TestClass>();
then I pass this List<TestClass> to a function which takes an argument
List<IPerson> person
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by: Paul |
last post by:
Hi,
I feel I'm going around circles on this one and would appreciate some other
points of view.
From a design / encapsulation point of view, what's the best practise for
returning a private List<as a property.
Consider the example below, the class "ListTest" contains a private "List<>"
called "strings" - it also provides a public method to add to that list,
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by: Andrew Robinson |
last post by:
I have a method that needs to return either a Dictionary<k,vor a List<v>
depending on input parameters and options to the method.
1. Is there any way to convert from a dictionary to a list without
itterating through the entire collection and building up a list?
2. is there a common base class, collection or interface that can contain
either/both of these collection types and then how do you convert or cast
from the base to either a...
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by: Zytan |
last post by:
The docs for List say "The List class is the generic equivalent of the
ArrayList class." Since List<is strongly typed, and ArrayList has
no type (is that called weakly typed?), I would assume List<is far
better. So, why do people use ArrayList so often? Am I missing
somehing? What's the difference between them?
Zytan
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by: Zytan |
last post by:
Obviously you can't just use a simple for loop, since you may skip
over elements.
You could modify the loop counter each time an element is deleted.
But, the loop ending condition must be checked on each iteration,
since the Count changes as you delete elements. I would think it is
guaranteed to be computed each time, and not cached.
So, is this the best way?
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by: Lee Crabtree |
last post by:
This seems inconsistent and more than a little bizarre.
Array.Clear sets all elements of the array to their default values (0,
null, whatever), whereas List<>.Clear removes all items from the list.
That part makes a reasonable amount of sense, as you can't actually take
items away from an Array. However, there doesn't seem to be a way to
perform the same operation in one fell swoop on a List<>.
For example:
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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