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by: Wenjie |
last post by:
Hello,
I have a class B to mediate/isolate between
implementation and their users (like used in
an abstract factory class pattern):
// B.h
class B {
static B* getImpl();
static void update(B*& previous, B*& current);
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by: Jim West |
last post by:
Both
int a;
std::complex<float> b;
std::complex<float> c = static_cast<float>(a)*b;
and
int a;
std::complex<float> b;
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by: GianGuz |
last post by:
Everyone knows about the complex and cpu-expensive procedures taken by
dynamic_cast to find the right function call in a virtual classes
hierarchy.
The question I would to rise is when dynamic_cast is really necessary?
A wise usage of templates and/or non dynamic_cast operators can grant
the compiler with any information it needs to understand at compile
time what is the right method to call.
In the following example I tested the usage of...
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by: nin234ATIyahoo.com |
last post by:
Hi all
I have a logger class and facing the following issue
enum eErrLvl
{
eLOG_DEBUG_5 = 1,
eLOG_DEBUG_4,
eLOG_DEBUG_3,
eLOG_DEBUG_2,
eLOG_DEBUG_1,
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by: bonham |
last post by:
i m a beginner in C++. I have some questions:
what is static_cast<unsigned>?
i saw someone use static_cast<unsigned> and static_cast<unsigned char>
together. why?
e.g. static_cast<unsigned>(static_cast<unsigned char>(c))
(c is a char).
Thank you!
Bon
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by: Dave Rahardja |
last post by:
Is it safe to use static_cast to downcast from a virtual base class?
For example,
class V {};
class A: public virtual V {};
class B: public virtual V {};
class C: public A, public B;
void fn(V& v)
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by: Rahul |
last post by:
Hi,
I have a
class A : public B {...member functions......data members};
and am doing the following
A *p=new A();
void *p=static_cast<void *>(p);
factory_instance->process(p);
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by: Bo Peng |
last post by:
Dear C++ experts,
I need to store and retrieve a meta information that can be int or
double. The program would be significantly simpler if I can handle two
types uniformly. Right now, I am using a single interface:
void setInfo(double); // store info
double info(); // retrieve info
and use
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by: Jim Langston |
last post by:
Is the following well defined?
size_t IntVal = 65537;
unsigned short Length;
if ( IntVal static_cast<unsigned short>( -1 ) )
{
std::cout << "Value too long to fit in a short" << std::endl;
}
else
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by: Rahul |
last post by:
Hi,
Everywhere I read that static_cast<only work fine for the conversion
which are implicitly allowed by the compiler
hence the following does not work
int *i;
double *d;
d = i; // Compilation error ,
OK
i= static_cast<int *>(d); // Compilation error. OK
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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...
|
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: 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: 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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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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