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by: Alexander Kervero |
last post by:
Hi ,today i was reading diveinto python book,in chapter 5 it has a very
generic module to get file information,html,mp3s ,etc.
The code of the example is here :
http://diveintopython.org/object_oriented_framework/index.html
One thing that i have some doubs is this part :
class FileInfo(UserDict):
"store file metadata"
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by: Daniel Graifer |
last post by:
Why doesn't c++ support virtual data? It supports class data of type
pointer to function (that's what virtual functions really are). In
terms of implementation, why can't I have other types of data in my vtable?
RTTI could be implemented this way instead of as a special case for the
compiler. It would also be useful for class specific memory management
implementations.
--
Daniel A. Graifer
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by: Zaharije Pasalic |
last post by:
I tried to implement multi-data list with a reference instead of
pointer to data, but code compiled with gcc perform "segmentation
fault". Generated code from other compilers: Borland C++ 5.0 and
Micros. C++ 6.0 is OK. What is wrong?
#include <iostream>
using namespace::std;
class base {
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by: Act |
last post by:
Why is it suggested to not define data members as "protected"?
Thanks for help!
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by: Vicente Nicolau |
last post by:
Hello
I'm making a PDA project that uses a data base. That data base is saved in a
xml file. When the application starts up, I load the xml file in memory. The
application makes changes in the data base (which is in the memory of the
PDA) and finally, when the program closes, it saves all data (which are in
the data base) in the xml file.
My question is: is there any way to save only the modifications instead of
to save again all data...
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by: Lloyd Dupont |
last post by:
I'm attempting to write a fairly complex data structure.
One part of the complexity is that all 8 data operations it supports
delegate some code to virtual method.
This is by design because I want the user to subclass the data structure and
be able to prevent changes to happen. and / or I want to notify observers.
The unfortunate side effect is: it seems there are no simple way to have all
user code run at the begining or at the end...
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by: atomik.fungus |
last post by:
Hi, im having problems compiling some code, and i dont understand why.
I've made a Matrix class for any kind of data and now im implementing
an inherited class with all the mathematical stuff (MMatrix)
(determinants and so on).
The data and the number of rows and columns are declared in the base
clase as protected. When i ask the functions of the inherited class to
use them, the compiler(g++) tells me that they haven't been declared in...
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by: nandhanvijay |
last post by:
hi every
am trying to connect data base in vb.net but am unable to connect. As per the book am following that says to connect to data base go to tools menu connect to data base option. u will get data link property . But am not getting that . Am getting add connection from which i can able to select the data base like oracle or sql but not able to move further. When i click test button. your test connection is fail. am not able to get data...
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by: ElTipo |
last post by:
Hello People,
I made a data base with secure wizard to provide to users a PID and Passwords. I need to extract data from Crystal Reports 7 in this data base but Crystal Reports send me a message like I cant extract data because I don't have rights to this data base. I am the "Admin" I don't Know what happens in this case.
I try to change the "Set Location" in Crystal Rpts but no results.
Crystal don't show me any window to put the...
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by: Immortal Nephi |
last post by:
First class is the base class. It has two data: m_Base1 and m_Base2.
Second class and third class are derived classes and they are derived
from first class. m_Base1 and m_Base2 are inherited into two derived
classes.
Second class has its own m_Base1 and m_Base2 and third class does the
same. I am curious. How can second class and third class share the
same m_Base1 and m_Base2?
You define second class first and enter data into...
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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: 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: 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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