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by: Giancarlo Niccolai |
last post by:
Hello all.
I have peeked through the FAQ and all relevant links, and also through
Stroustrup book, but I have not been able to find an answer, so I have to
post here as a last resort.
It makes sense that if you have virtual destructors, they are eventually
used in the explicit destructor call when using the placement new semantic:
class A {
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by: Ioannis Vranos |
last post by:
When we use the standard placement new operator provided in <new>, and
not a definition of owr own, isn't a call to placement delete enough?
Consider the code:
#include <new>
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by: elviin |
last post by:
Hello.
I tried a sample programm using placement new. I am not sure if i
understand this technique correctly. I do not mean usage but a real
world application. Could anyone to describe some applications where it
gives reason to use placement new? My doubts come from my consideration
that if I delete an object (e.g. 50MB) then system can allocate this
chunk of memory to another process and my process will not be able to
re-use this...
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by: mangesh |
last post by:
This code is from c++ faq in section 11 :
void someCode()
{
char memory;
void* p = memory;
Fred* f = new(p) Fred();
f->~Fred(); // Explicitly call the destructor for the placed
object
}
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by: SarahT |
last post by:
Hi folks,
I am doing something Very Bad and Wrong (which I'll spare you the
details of) that requires overloading new for some specific classes.
So, for example:
class MyWeirdThingy
{
public:
...
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by: LuB |
last post by:
I am constantly creating and destroying a singular object used within
a class I wrote.
To save a bit of time, I am considering using 'placement new'. I guess
we could also debate this decision - but for the sake of this post ...
I'm searching for an answer that assumes said decision.
If I allocate memory in the class declaration:
char buffer;
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by: karthikbalaguru |
last post by:
Hi,
I find that articles stating that 'placement new' constructs an object
on a pre-allocated buffer and so takes less time.
Actually, we have to consider the allocation of the buffer and then
the construction of object using 'placement new'. So, Effectively it
should be taking more time . What do you think ?
I think,
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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:
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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: 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: 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: 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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