| |
by: Icosahedron |
last post by:
I've been going through some old code trying to clean it up
and rearchitect it based on more modern C++ idioms. In the
old code I often used the Pimpl idiom on a class by class
basis, creating impl within a class as such:
a.h
class A {
...stuff...
struct AImpl;
AImpl* _impl;
|
by: Steven T. Hatton |
last post by:
Pete Vilder mentioned this a few days back. This is the "Compiler-Firewall
Idiom", or pimple. It's similar to an approach taken in some Java designs.
AAMOF, when I saw it in Java, my first reaction was "Oh by Þor! It's
freakin' headers all over again!"
My greatest misgiving about the approach is that it seems overly
complicated. I /feel/ as if there is a better more 'conventional' way of
dealing with the separation of interface and...
|
by: Peteris Krumins |
last post by:
Hello!
I was playing around pimpl idiom and discovered that there is a problem
with it if a class member template function exists which has to access
private data, since only the forward declaration of pimpl class is
provided.
Example:
|
by: Edward Diener |
last post by:
Because 'friend' is not recognized in MC++, using the pImpl idiom in MC++
classes seems nearly impossible. Normally a pImpl class is a 'friend' to the
class for which it supplies the private implementation, so that it can
access any protected members, including inherited protected members, of that
class. Without 'friend' the pImpl class can no longer do this, and it is a
PITA passing the necessary protected data or protected member function...
|
by: red floyd |
last post by:
It seems that the use of auto_ptr<> is discouraged in many places in
favor of boost::shared_ptr<> (or tr1::shared_ptr<>). But consider a
PIMPL idiom, where there is a strict 1-1 relationship between interface
objects and implementation object, and the implementation object lasts
for the lifetime of the interface object.
i.e.
// header file
class WidgetImpl;
class Widget {
|
| |
by: Asfand Yar Qazi |
last post by:
Hi,
I'm creating a library where several classes are intertwined rather tightly.
I'm thinking of making them all use pimpls, so that these circular
dependancies can be avoided easily, and I'm thinking of making all these pimpl
class declarations public. Reasoning is that since only the code within the
..cc file will need to ever access them, why protect them in ways that would
make access to them more difficult and obfuscated?
What...
|
by: Noah Roberts |
last post by:
Some little tidbit I just ran into that might help some, especially
novice programmers.
If you are using the pimpl idiom, as you probably should be most of the
time, then it is very straightforward to turn your class into a
singleton object. Consider:
class X
{
struct impl;
|
by: Daniel Lidström |
last post by:
Hello!
I have just discovered a way to use the private implementation idiom
(pimpl), without the overhead of dynamic memory allocation. For those of
you who don't know what this is, Wikipedia has a nice article you can
read. Anyway, I discovered that if you make all members in the
implementation class mutable, you can in fact use this idiom without any
"unnecessary" memory allocation. Here's a minimal example of the method:
// In the...
|
by: Graham Reitz |
last post by:
What are good strategies for selecting, either at run-time or compile
time, various pimpl'ed implementations? While retaining the ability
to switch implementations without recompiling.
Boost has an example but with only one implementation class: (what
would an example with 2 implementation classes look like?)
http://www.boost.org/doc/libs/1_35_0/libs/smart_ptr/sp_techniques.html#pimpl
The pimpl'ed class cpp file has to include at...
|
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...
|
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: 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...
|
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...
|
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();...
|
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...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
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
|
| |
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...
|
