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by: dan |
last post by:
without stirring the pot too much --
could someone please point me to whatever documentation exists on the
philosophy, semantics, and practical implications of how Python
implements the assignment operator? So far I can't find much useful
in the regular documentation. I understand the basic concept that
names are bound to objects which exist on the heap, but that still
doesn't explain why a = b doesn't _always_ cause a to point to the...
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by: Michal Vitecek |
last post by:
hello,
i have a data cache which sits between a slow database and my server and
it's used to cache data retrieved from the database. in order for it to
work correctly (race-conditions) i need a fast deep-copying of
instances (the cache is used heavily).
i tried to use copy module but it's *very* slow, then i tried cPickle
to pickle and depickle instances which was faster, but still slow.
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by: Thomas Matthews |
last post by:
Hi,
I'm looking for an efficient method to deep copy
containers of fields. A Field is a parent class
with children such as Integer_Field, String_Field,
and Date_Field, etc. The algorithm / method should
ensure that an Integer_Field is not copied (assigned)
to a String_Field or other descendant of Field.
I have looked at the Visitor design pattern with
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by: Tony Johansson |
last post by:
Hello!
I'm reading in a book about C++ and that is something that sound strange.
It says "Pointers have reference-assignment semantics similar to those in
Java. For example, after the assignment
Student* john = michael;
both john and michael share the same object. This type of an assignment is
different then value-assignmnet semantics used by class variables, as in
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by: Christoph Boget |
last post by:
I've looked through the online documentation and I
couldn't find a real explanation as to exacly what is
involved with either of the above or exacly what they
mean.
If someone could point me to the proper documentation
that discusses this topic, I'd be ever so appreciative!
thnx,
Christoph
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by: jjkboswell |
last post by:
I have an XSD which I have generated a class from using the xsd.exe
tool. My XSD contains complex types within it, so that the generated
class has member variables which are of types that are also defined in
the XSD.
I deserialize XML data into instances of that class, and serialize back
to XML. So far so good.
However, in my code I have the concept of wanting to create new copies
of these deserialized objects and modifying some of...
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by: blangela |
last post by:
I have decided (see earlier post) to paste my Word doc here so that it
will be simpler for people to provide feedback (by directly inserting
their comments in the post). I will post it in 3 parts to make it more
manageable.
Below is a draft of a document that I plan to give to my introductory
C++ class.
Please note that I have purposely left out any mention of safety issues
in the ctors which could be resolved thru some combination...
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by: Jon Skeet [C# MVP] |
last post by:
I'm sure the net will be buzzing with this news fairly soon, but just
in case anyone hasn't seen it yet:
Microsoft are going to make the source code for the .NET framework
(parts of it, including the BCL, ASP.NET and LINQ) available both for
viewing and debugging into.
I won't go into all the details here, as they're covered on Scott
Guthrie's blog:
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by: Ben Rudiak-Gould |
last post by:
Background: I have some structs containing std::strings and std::vectors of
other structs containing std::strings and std::vectors of .... I'd like to
make a std::vector of these. Unfortunately the overhead of the useless
copies made each time the vector is resized is too large for me to ignore. I
know that rvalue references fix this problem, but I don't think they'll be
widely available for years and I need something that works now....
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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...
|
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: 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: 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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