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by: Jef Driesen |
last post by:
Is it allowed by the C++ standard to mix the use of 'new/delete' and
'operator new/delete'?
(a) alloc (version 1) + free (version 2)
(b) alloc (version 2) + free (version 1)
// VERSION 1 ALLOC (using operator new + placement new)
type* data = (type*)operator new(n * sizeof(type));
for (type* p = data; p != data + n; ++p)
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by: Axel Panning |
last post by:
Hallo,
ich hab bei einem Programm bei mir festgestellt, daß das "deleten" von
Feldern erheblich länger dauert, als das Anlegen von Feldern. p. Bei
einem Programm von mir werden oft große Datenfelder unterschiedlicher
Größe angelegt und wieder gelöscht. Daher ist dieser Umstand sehr ungünstig.
Ist das Normal, daß der Unterschied bei Faktor 10-20 liegt? Oder begehe
ich hier an irgendeiner Stelle einen grundlegenden Fehler!?
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by: robert |
last post by:
been ruminating on the question (mostly in a 390/v7 context) of
whether, and if so when, a row update becomes an insert/delete.
i assume that there is a threshold on the number of columns of
the table, or perhaps bytes, being updated where the engine just
decides, screw it, i'll just make a new one.
surfed this group and google, but couldn't find anything.
the context: we have some java folk who like to parametize/
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by: vcornjamb |
last post by:
Hello, I am developing a web form that contains some buttons and a data grid
which has as its last column link buttons that will delete the data
associated
with that row. Everything works fine, but users have requested a
confirmation
message pop up so the user can confirm the delete. I can not quite get
this to
work. Here are the facts:
I am working in the Microsoft Development Environment 2003 (Version
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by: polocar |
last post by:
Hi,
I'm writing a program in Visual C# 2005 Professional Edition.
This program connects to a SQL Server 2005 database called
"Generations" (in which there is only one table, called
"Generations"), and it allows the user to add, edit and delete the
various records of the table.
"Generations" table has the following fields:
"IDPerson", NamePerson", "AgePerson" and "IDParent".
A record contains the information about a person (his name, his...
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by: rn5a |
last post by:
The .NET 2.0 documentation states the following:
When using a DataSet or DataTable in conjunction with a DataAdapter & a
relational data source, use the Delete method of the DataRow to remove
the row. The Delete method marks the row as Deleted in the DataSet or
DataTable but does not remove it. Instead when the DataAdapter
encounters a row marked as Deleted, it executes its DeleteCommand
method to delete the row at the data source. The...
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by: Matt |
last post by:
I am writing a DELETE statement and I want to filter the records using
another SELECT statement.
My SELECT statement is a GROUP BY query that grabs all social security
numbers from the "Data With Import Date Current" table on a given day
where there was only one transaction (count of SSN = 1). I want to
delete these records from the "Data With Import Date Current" table.
I would like to do this by joining the "Data With Import Date...
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by: bluez |
last post by:
I want to design a webpage where user can search the data from the database and list out the related records. Each of the record got a delete button which allow user to delete the record.
Filename : search_student.php
<?php
include("../user_access/user_access_control.php");
include("../Database/database.php");
$searchStudentControl = new Access_user;
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by: jeffjohnson_alpha |
last post by:
We all know that a new-expression,
foo* a = new foo() ;
allocates memory for a single foo then calls foo::foo(). And we know
that
void* p = ::operator new(sizeof(foo)) ;
allocates a sizeof(foo)-sized buffer but does NOT call foo::foo().
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by: Nethali |
last post by:
Hi all,
Please explain me the following:
I have struct as follows:
struct Link
{
void* data;
Link* next;
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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: 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: 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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