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by: Jacob Jensen |
last post by:
This question has probably been asked a million time, but here it comes
again. I want to learn the difference between the three type cast operators:
static_cast, reinterpret_cast, dynamic_cast. A good way to do this is by
example. So I will give an example and please tell me what you think:
I have a base
class A
with a virtual destructor, and a
class B
that is it inherits publicly from A and defines som extra stuff.
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by: Brian Blais |
last post by:
Hello,
I saw on a couple of recent posts people saying that casting the return
value of malloc is bad, like:
d=(double *) malloc(50*sizeof(double));
why is this bad? I had always thought (perhaps mistakenly) that the
purpose of a void pointer was to cast into a legitimate date type. Is
this wrong? Why, and what is considered to be correct form?
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by: ytrama |
last post by:
Hi,
I have read in one of old posting that don't cast of pointer which
is returned by the malloc. I would like to know the reason.
Thanks in advance,
YTR
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by: yufufi |
last post by:
lets say we have a 'shape' class which doesn't implement IComparable
interface..
compiler doesn't give you error for the lines below..
shape b= new shape();
IComparable h;
h=(IComparable)b;
but it complains for the following lines
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by: Jim Bancroft |
last post by:
Hi everyone,
A basic one here, I think. I haven't found the pattern yet, but
sometimes when I cast a variable to another type using the "C" style cast
operator the compiler refuses to play along. It says it's an invalid cast.
However, if I use the Convert.ToInt32() method (for example) things will
work. At least, that's how it appears to me.
Could someone explain when to use old-style parenthesized casts vs. the
Convert() methods?
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by: Enrique Bustamante |
last post by:
Casting arrays that works on watch and command window but not in code.
My application is casting arrays in a way it should work. To test if I
was doing something invalid, I wrote a test code that has similar
structure of the classes in my application. The test worked fine, the
casting I want to do must work. I compared the structure of the test
with the application to ensure they where similar (inheriting twice,
base class implements...
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by: S. Lorétan |
last post by:
Hi guys,
Sorry for this stupid question, but I don't know why it isn't working.
Here is my (example) code:
namespace Test {
class A {
public string Label1;
}
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by: sophia.agnes |
last post by:
Hi ,
I was going through peter van der linden's book Expert C programming,
in this book there is a section named "How and why to cast"
the author then says as follows
(float) 3 - it's a type conversion and the actual bits change.
if you say (float) 3.0 it is a type disambiguation,and the compiler
can plant the correct bits in the first place.some people say that
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by: Taras_96 |
last post by:
Hi everyone,
I was experimenting with static_cast and reinterpret cast
#include <iostream>
struct A1 { int a; };
struct A2 { double d; };
struct B : public A1, A2
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by: Tinkertim |
last post by:
Hi,
I have often wondered if casting the return value of malloc() (or
friends) actually helps anything, recent threads here suggest that it
does not .. so I hope to find out.
For instance :
char *tmp = NULL;
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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: 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: 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: 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: 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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