By Adrien Hamelin | Aug 13, 2019 10:26 AM | Tags: community
The series continue.
Chaining Output Iterators Into a Pipeline
by Jonathan Boccara
From the article:
We’ve been over a various set of smart output iterators over the past few weeks. Today we explore how to combine them and create expressive code.
By Adrien Hamelin | Aug 7, 2019 11:27 AM | Tags: community c++17
Table of contents.
C++ Core Guidelines: Supporting Sections
by Rainer Grimm
From the article:
Let's recapitulate. In the last two years, I have written about 100 posts to the C++ Core Guidelines. Why? The document answers: "This document is a set of guidelines for using C++ well. The aim of this document is to help people to use modern C++ effectively.". But my story does not end here. The guidelines have a supporting section...
By Adrien Hamelin | Aug 7, 2019 11:06 AM | Tags: advanced
Quick A: to help the compiler understand what the programmer wants.
Recently on SO:
Where and why do I have to put the “template” and “typename” keywords?
In order to parse a C++ program, the compiler needs to know whether certain names are types or not. The following example demonstrates that:
t * f;How should this be parsed? For many languages a compiler doesn't need to know the meaning of a name in order to parse and basically know what action a line of code does...
By Adrien Hamelin | Aug 5, 2019 12:42 PM | Tags: basics
Quick A: optimisation compilers are allowed to do for perfomance.
Recently on SO:
What are copy elision and return value optimization?
Copy elision is an optimization implemented by most compilers to prevent extra (potentially expensive) copies in certain situations. It makes returning by value or pass-by-value feasible in practice (restrictions apply).
It's the only form of optimization that elides (ha!) the as-if rule - copy elision can be applied even if copying/moving the object has side-effects...
By rodburns | Aug 1, 2019 11:43 PM | Tags: None
Dynamic polymorphism is a widely used C++ feature that allows code to be more flexible, and helps create easily extendable interfaces by overriding the base class specified interfaces inside our derived classes. However, in SYCL kernel code in order to emulate dynamic polymorphism we need to use some curious tricks and techniques.
Enabling Polymorphism in SYCL using the C++ idiom "Curiously Recurring Template Pattern"
by Georgi Mirazchiyski
From the article:
The CRTP idiom offers an alternative approach to polymorphism by providing us with the ability to specify static interfaces, where the base class specifies the the structure of the interface, while the derived one represents the implementation. In this case, the base class does represent the interface and the derived class represents the implementation — similar to the general idea of polymorphism.
By Andrey Karpov | Jul 30, 2019 10:23 AM | Tags: static code analysis static analysis sast legacy code code quality
Gradually and imperceptibly we get the situation when C++ projects’ complexity becomes extreme. Unfortunately, now a C++ programmer can’t be on his own.
Why Static Analysis Can Improve a Complex C++ Codebase
by Andrey Karpov
From the article:
Analyzers know more than even professional developers. It has become too difficult to take into account and remember all the nuances when writing code. For instance, if you haven’t specifically read about it, you’ll never guess that calls to memset function for clearing private data sometimes disappear, as from a compiler’s point of view, a call to memset function is redundant. Meanwhile, it is a serious security defect CWE-14 that is detected literally everywhere.
By Adrien Hamelin | Jul 29, 2019 10:30 AM | Tags: experimental community
Another report, another point of view.
The German tour: Cologne trip report
by Guy Davidson
From the article:
This trip report is a little different: not only did I attend the C++ Standard committee in Cologne, but I went on to speak at the Munich C++ meetup on the following Monday...
By Adrien Hamelin | Jul 29, 2019 10:29 AM | Tags: experimental
Get familiar with it, it's coming and it's going to help you!
Comparisons in C++20
by Barry Revzin
From the article:
Now that the Cologne meeting is over and we’ve more or less finalized (at least before the NB comments come in) C++20, I wanted to take the time to describe in detail one of the new language features we can look forward to. The feature is typically referred to as operator<=> (defined in the language as “three-way comparison operator” but more colloquially referred to as “operator spaceship”), but I think it has broader scope than that.
We’re not just getting a new operator, we’re significantly changing the semantics of how comparisons work at a language level...
By Adrien Hamelin | Jul 26, 2019 12:51 PM | Tags: community
Lots happened!
Trip Report: C++ Standards Meeting in Cologne, July 2019
by Botond Ballo
From the article:
Last week I attended a meeting of the ISO C++ Standards Committee (also known as WG21) in Cologne, Germany. This was the second committee meeting in 2019; you can find my reports on preceding meetings here (February 2019, Kona) and here (November 2018, San Diego), and previous ones linked from those. These reports, particularly the Kona one, provide useful context for this post...
By Adrien Hamelin | Jul 26, 2019 12:50 PM | Tags: community
Are you attending?
Another jam-packed CppCon
by Kate Gregory
From the article:
CppCon is approaching again and my calendar is FULL. The schedule may change and there are things still to be added, but the current plan is...