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by: Lars Tackmann |
last post by:
Hi
I have a problem where i have allocated an array on the heap, using
new in a class called "Array". In the end of my main i call a visit
method that visits all of the elements in class "Array" using a
visitor object
eg.
// visits each element in the list
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by: trash |
last post by:
I do this kindda stuff often:
class CVisitableObjectVector : public
std::vector<Loki::BaseVisitable<>*> {
void Enable(bool enable);
....
};
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by: Imre Palik |
last post by:
Hi,
I am trying to create a framework, that automatically generates a base
class for the visitor pattern:
template <typename param, typename ret = void>
struct visitor
{
typedef ret return_type;
virtual return_type visit(param *) = 0;
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by: FluffyCat |
last post by:
New on November 28, 2005 for www.FluffyCat.com PHP 5 Design Pattern
Examples - the Visitor Pattern.
In the Visitor pattern, one class calls a function in another class
and passes an instance of itself. The called class has special
functions for each class that can call it.
With the visitor pattern, the calling class can have new operations
added without being changed itself.
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by: Merlin |
last post by:
Probably there is no right or wrong answer to this but I thought to ask
to put my mind at rest. Ok lets say you have a object hierarchy (eg.
the Glyph in Lexi from GOF book) and you want to use the visitor
pattern. So we place an accept method in the the base class glyph and
procede to create the visitor hierarchy. The accept signature will look
like this
void Glyph::Accept(Visitor& v);
The Visitor hierarchy will have a Vistor base...
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by: Siphiuel |
last post by:
Hi everyone.
When using visitor pattern, we have a nasty dependence on the types of
visitable objects that is coded way on top on the visitor hierarchy. i
mean, like this:
class AbstractVisitor
{
public:
virtual void visit(Object_type_1 *);
virtual void visit(Object_type_2 *)
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by: RedLars |
last post by:
Hi,
Given this class definition,
public class Node
{
Node parent;
object current;
ArrayList children;
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by: JosAH |
last post by:
Greetings,
this week we let go of all that algebraic stuff and concentrate a bit more on
what object oriented programming is all about. Java claims to support OO, so
why not use it? In this week's article we're going to talk a bit about when
and why to apply certain patterns. We'll start with the Visitor pattern.
The pattern is also named 'double dispatch' which will become clear near the
end of this little article. Here's the...
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by: weaknessforcats |
last post by:
Design Patterns: Visitor
Introduction
Polymorphism requires a class hierarchy where the interface to the hierarchy is in the base class. Virtual functions allow derived classes to override base class functions. Applications using polymorphism typically have functions with base class pointers or references as arguments. Then derived objects are created and used as arguments to these functions. Inside the function, only the base class methods...
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by: aaragon |
last post by:
Hello everyone,
I've been trying to work with the visitor design pattern, and it works
fine except for the following.
Let's suppose that we have a fixed hierarchy of classes (many of them)
which I cannot modify. I decided to use the visitor design pattern
depending on the actual type of the classes because those classes
already support the loki visitor.
#include <Loki/Visitor.h>
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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: 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: 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: 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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