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By Blog Staff | Dec 20, 2022 01:54 PM | Tags: None
A canonical example:
by Rainer Grimm
From the article:
Purpose: Defines a family of algorithms and encapsulates them in objects
Also known as: Policy
Use case:
By Blog Staff | Dec 19, 2022 01:53 PM | Tags: None
With or without actual templates:
by Rainer Grimm
From the article:
The key idea of the Template Method is easy to get. You define the skeleton of an algorithm that consists of a few typical steps. Implementation classes can only override the steps but cannot change the skeleton. The steps are often called hook methods...
By Blog Staff | Dec 17, 2022 02:59 PM | Tags: None
When profiling is a good thing:
C/C++ Profiling Tools
by David Faure
From the article:
This blog will give you a brief overview of profiling C and C++ applications. Additionally, it will lay before you all of the tools available, with the purpose of aiding you in choosing the right tools at the right times...
By Blog Staff | Dec 17, 2022 02:45 PM | Tags: None
Const... times four:
by Bartlomiej Filipek
From the article:
As of C++20, we have four keywords beginning with const. What do they all mean? Are they mostly the same? Let’s compare them in this article...
By Jens Maurer | Dec 6, 2022 06:08 AM | Tags: c++11 basics
Lambdas
Modern C++ In-Depth — Lambdas, Part 1
by Phani Adusumilli
From the article
While lambdas do not allow us to write anything we could not have written before their introduction, they greatly improve the ease with which we can write function objects and callbacks.
By Blog Staff | Nov 16, 2022 07:37 PM | Tags: None
constexpr keeps getting more and more powerful with each release:
C++ constexpr parlor tricks: How can I obtain the length of a string at compile time?
by Raymond Chen
From the article:
Say you want to obtain, at compile time, the length of a compile-time string constant. The problem is that the strlen function is not constexpr...
By Blog Staff | Nov 16, 2022 07:35 PM | Tags: None
Playing the classics, at arm's length...
The Proxy Pattern
by Rainer Grimm
From the article:
A proxy controls access to another object, allowing you to perform additional operations before or after you access the original object. Sound familiar?
Which idiom is characteristic of C++? Right: RAII (Resource Acquisition Is Initialization). RAII is the C++ way to implement the Proxy Pattern. Here are the facts about the Proxy Pattern. ...
By Blog Staff | Nov 16, 2022 07:27 PM | Tags: None
When having the "last word" makes stuff go faster...
Using final in C++ to improve performance
by Niall Cooling
From the article:
The
finalspecifier was introduced in C++11 to ensure that either a class or a virtual function cannot be further overridden. However, as we shall investigate, this also allows them to perform an optimization known as devirtualization, improving runtime performance.
By Blog Staff | Nov 12, 2022 06:01 PM | Tags: None
As Crocodile Dundee famously said, "That's not a loop, that's a loop." Just programmers having fun:
For Software Performance, the Way Data is Accessed Matters!
by Ivica Bogosavljević
From the article:
In our experiments with the memory access pattern, we have seen that good data locality is a key to good software performance. Accessing memory sequentially and splitting the data set into small-sized pieces which are processed individually improves data locality and software speed.
In this post, we will present a few techniques to improve the memory access pattern and increase data locality. The advantage of this approach is that the changes are localized in the algorithm itself, i.e. there is no need to change the data layout or the memory layout. The disadvantage is that the algorithms often become more difficult to understand and modify. ...
[... and deep inside the article ...]
Notice that, because the whole cache line is brought from the memory to the data cache, after accessing a[j][i] we can access a[j][i + 1]cheaply, since these two pieces of data belong to the same cache line. The problem in our case is that if n is large, access to a[j][i + 1] will come much after a[j][i] and by that time a[j][i + 1] will be evicted from the data cache. ...
By Blog Staff | Nov 11, 2022 11:35 AM | Tags: None
Playing the classics...
The Facade Pattern
by Rainer Grimm
From the article:
The key idea of the Facade Pattern is to provide a simplified interface to a complex system...
The Facade Pattern is an ideal starting point for decoupling complex systems by introducing layers. Additionally, it can be used as a starting point for deprecating the old interface.
Here are the facts. ...