Optimizing C++ Code with O(1) Operations -- Giovanni Dicanio

By Giovanni Dicanio | May 11, 2022 01:58 PM | Tags: None

Continuing from the previous Adventures with string_view post, in this new article I show how you can achieve massive performance gains using code characterized by O(1) constant-time asymptotic complexity.

Adventures with string_view: Optimizing Code with O(1) Operations

by Giovanni Dicanio

From the article:

While this code works fine, it’s possible to optimize it.

As the saying goes, first make things work, then make things fast.

Replacing a O(N) operation with a O(1) operation in this case gives a performance boost of 88 ms vs. 445 ms, which is an 80% performance gain!

 

Check Types with Concepts - The Motivation--Rainer Grimm

By Adrien Hamelin | May 11, 2022 01:35 PM | Tags: c++20

The series continue.

Check Types with Concepts - The Motivation

by Rainer Grimm

From the article:

static_assert allows you to check at compile time if a type T fulfills the Concept: static_assert(Concept<T>).

C++20 Coroutines back to basics — Restrictions and rules for legal coroutines--Gajendra Gulgulia

By Adrien Hamelin | May 11, 2022 01:25 PM | Tags: c++20

Surprising but useful.

C++20 Coroutines back to basics — Restrictions and rules for legal coroutines

by Gajendra Gulgulia

From the article:

In my previous articles on coroutines, I attempted to explain the mechanics of coroutine suspension, resuming it, promise_type, awaiters and awaitables. In this article, I would like to answer two very basic questions:

• What are the restrictions on coroutines ?
• When can a coroutine usage be legal in terms of member, non-member functions of class/structs, lambda expressions and so on ?

Using Requires Expression in C++20 as a Standalone Feature--Rainer Grimm

By Adrien Hamelin | May 11, 2022 01:23 PM | Tags: c++20

The series continue.

Using Requires Expression in C++20 as a Standalone Feature

by Rainer Grimm

From the article:

In my last post "Defining Concepts with Requires Expressions", I exemplified how you can use requires expressions to define concepts. Requires expressions can also be used as a standalone feature when a compile-time predicate is required...

Call for talks for Meeting C++ 2022

By Meeting C++ | May 10, 2022 07:17 AM | Tags: meetingcpp community

The official call for talks for this years Meeting C++ conference. To promote this years call for talks, Meeting C++ online organizes an event about technical speaking for C++. On May 24th 8 great speakers will share some of the aspects on preparing and giving talks with you...

Call for talks for Meeting C++ 2022

by Jens Weller

From the article:

In begin of April Meeting C++ 2022 was announced, and since then also the call for talks is technically running and a first set of interesting talks has been submitted.

As Meeting C++ 2022 is a hybrid conference, taking place online and in Berlin. Likely the bigger audience will be online, and speakers are expected to be ready to give their talk online. You can submit and edit your talk until June 12th.

Modern C++ In-Depth — Move Semantics, Part 2

By Jens Maurer | May 9, 2022 12:02 AM | Tags: None

Moves

    Modern C++ In-Depth — Move Semantics, Part 2

    by Phani Adusumilli

From the article

    In this installment, we'll take a look at how we might go about defining move semantics for our own custom types, should we need them.

Local Time--Andrzej Krzemieński

By Adrien Hamelin | Apr 29, 2022 08:50 AM | Tags: c++20

Correct time tables.

Local Time

by Andrzej Krzemieński

From the article:

In this post we will see how to solve the task from the previous post, but display the time point in local time instead of system time. The solution is simple and takes only two additional lines (you can scroll down towards the end), but I want to take this opportunity to offer some reflections about the concepts of time zones and daylight saving time...

Defining Concepts with Requires Expressions--Rainer Grimm

By Adrien Hamelin | Apr 29, 2022 08:49 AM | Tags: c++20

The series continue.

Defining Concepts with Requires Expressions

by Rainer Grimm

From the article:

In my last post "Define Concepts", I defined the concepts Integral, SignedIntegral, and UnsigendIntegral using logical combinations of existing concepts and compile-time predicates. Today, I use Requires Expressions to define concepts...

C++20 Ranges Algorithms - 7 Non-modifying Operations--Bartlomiej Filipek

By Adrien Hamelin | Apr 27, 2022 08:31 AM | Tags: c++20

Are you using them?

C++20 Ranges Algorithms - 7 Non-modifying Operations

by Bartlomiej Filipek

From the article:

C++20’s Ranges offer alternatives for most of <algorithm>'s'. This time I’d like to show you ten non-modifying operations. We’ll compare them with the “old” standard version and see their benefits and limitations.

Let’s go...

New C++ features in GCC 12--Marek Polacek

By Adrien Hamelin | Apr 27, 2022 08:26 AM | Tags: experimental c++20

Time to update.

New C++ features in GCC 12

by Marek Polacek

From the article:

Version 12.1 of the GNU Compiler Collection (GCC) is expected to be released in April 2022. Like every major GCC release, this version will bring many additions, improvements, bug fixes, and new features. GCC 12 is already the system compiler in Fedora 36. GCC 12 will also be available on Red Hat Enterprise Linux in the Red Hat Developer Toolset (version 7) or the Red Hat GCC Toolset (version 8 and 9).

Like the article I wrote about GCC 10, this article describes only new features affecting C++.

We implemented several C++23 proposals in GCC 12. The default dialect in GCC 12 is -std=gnu++17; to enable C++23 features, use the -std=c++23 or -std=gnu++23 command-line options. (The latter option allows GNU extensions.)

Note that C++20 and C++23 features are still experimental in GCC 12...