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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: Mikhail N. Kupchik |
last post by:
Hi All.
I have a question regarding C++ programming language standard. It
is related to standard library, not to the core language.
Is it portable to instantiate template class std::list<> with
incomplete type? I've seen some STL implementations which allow this
and some others that does not. I did not find any mentioning of this
topic in the standard, maybe I searched not enough thoroughly?
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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: 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: 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: Zytan |
last post by:
This returns the following error:
"Cannot modify the return value of
'System.Collections.Generic.List<MyStruct>.this' because it is
not a variable"
and I have no idea why! Do lists return copies of their elements?
Why can't I change the element itself?
class Program
{
private struct MyStruct
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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: paul.gibson |
last post by:
A simple code example is easier than trying to describe the issue. I
have:
public class myClassA
{
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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: 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: 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: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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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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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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