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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: 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: Iron Moped |
last post by:
I'm airing frustration here, but why does LinkedList<not support the
same sort and search methods as List<>? I want a container that does not
support random access, allows forward and reverse traversal and
natively supports sorting, i.e., STL's list<T>. There isn't even a set of
algorithms that would allow me to easily sort a generic collection.
System.Array has a robust set of static algorithms, why not extend this to
ICollection?
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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: SC |
last post by:
How do I create at runtime a list of string (List<stringstrs = new
List<string>(); fill it) and then bind it to a DataGridViewColumnBox?
Setting the columns DataSource to the list doesn't display any data, i.e.,
OnNewRow Event:
myDataViewGrid.Row.Cell.DataSource = strs;
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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: Jonathan Wood |
last post by:
I see that I can create a List<stringlist and bind it to a GridView
control (by setting the DataSource property to the list and calling the
DataBind method).
What's the trick to doing the same thing with my own classes instead of a
simple string? Is there an interface or something I can implement so that
the GridView control can detect the properties of my object and display them
?
Thanks.
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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: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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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: 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: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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