Model-View-Controller -- Rainer Grimm

By Blog Staff | Apr 27, 2023 09:43 AM | Tags: None

The Model-View-Controller (MVC) is one of the classic architectural patterns from the book "Pattern-Oriented Software Architecture, Volume 1". It addresses interactive applications with a  flexible human-machine interface.

Model-View-Controller

by Rainer Grimm

From the article:

The MVC divides the program logic of a user interface into separate components model, view, and controller. The model manages the data and rules of the application. The view represents the data, and the controller interacts with the user.

Purpose

• User interfaces need to be changed frequently
• Different user interfaces must be supported
• The data model is stable

Solution

• The application is divided into the components Model (data model), View (output components), and Controller (input components)
• Multiple output components can use the same data model

Results summary: 2023 Annual C++ Developer Survey "Lite"

By Blog Staff | Apr 27, 2023 09:06 AM | Tags: None

Over the past week, we ran our 2023 annual global C++ developer survey. Thank you to everyone who responded. As promised, here is a summary of the results:

CppDevSurvey-2023-summary.pdf

The results have now been forwarded to the C++ standards committee to help inform C++ evolution. Your feedback will be very helpful, and thank you again for your participation! Stay safe, everyone.

2023-04 Mailing Available

By Administrator | Apr 25, 2023 02:50 PM | Tags: None

The 2023-04 mailing of new standards papers is now available.

Tonight 20:00 CEST/Berlin/Amsterdam: Meeting C++ online book & tool fair

By Meeting C++ | Apr 25, 2023 01:07 AM | Tags: meetingcpp community

Join us tonight (20:00 CEST/Berlin/Amsterdam) for the Meeting C++ online book & tool fair!

Meeting C++ online book & tool fair

About the event:

Tonight will featuring 3 tools and one book in the fair and the kick off livestream with demos at 20:00 CEST:

• Undo.io
• Modern C++ for absolute Beginners by Slobodan Dmitrović
• Conan 2.0
• KDABs open source tools: hotspot, heaptrack, gammaray and more

The second part of the event will be in the Hubilo lounge, where you can visit each of the above tools and books at their own table and ask your questions!

C++20: consteval and constexpr Functions -- Daniel Lemire

By Blog Staff | Apr 24, 2023 01:21 PM | Tags: None

Optimizing compilers seek try to push as much of the computation as possible at compile time.

C++20: consteval and constexpr Functions

by Daniel Lemire

From the article:

In modern C++, you can declare a function as ‘constexpr’, meaning that you state explicitly that the function may be executed at compile time.

The constexpr qualifier is not magical. There may not be any practical difference in practice between an inline function and a constexpr function, as in this example:

inline int f(int x) {
  return x+1;
}

constexpr int fc(int x) {
  return x+1;
}

Functional exception-less error handling with C++23’s optional and expected -- Sy Brand

By TartanLlama | Apr 23, 2023 11:13 AM | Tags: None

std::optional has been updated in C++23, and std::expected added as a new way of representing errors in your code. Read more about them here:

Functional exception-less error handling with C++23’s optional and expected

by Sy Brand

From the article:

std::optional<T> expresses “either a T or nothing”. C++23 comes with a new type, std::expected<T,E> which expresses “either the expected T, or some E telling you what went wrong”. This type also comes with that special new functional interface. As of Visual Studio 2022 version 17.6 Preview 3, all of these features are available in our standard library. Armed with an STL implementation you can try yourself, I’m going to exhibit how to use std::optional‘s new interface, and the new std::expected to handle disappointments.

Simple Usage of C++20 Modules -- Victor Zverovich

By Blog Staff | Apr 21, 2023 01:18 PM | Tags: None

In my previous post I showed how to compile {fmt} as a C++20 module with clang. Although taking only two commands, ideally it’s not something you should be doing manually. So in this post, I’ll talk about module support in CMake, everyone’s favorite not a build system.

Simple Usage of C++20 Modules

by Victor Zverovich

From the article:

My first attempt was to use the CMake’s built-in functionality advertised in “import CMake; C++20 Modules”. And after some struggle I made it to work with clang but unfortunately it was very limited. Here are some of the problems and limitations that I discovered:

1. It only worked with ninja and while I don’t have anything against this build system it’s an extra hassle to get this additional dependency installed while make is usually available by default. This restriction also likely means that you cannot use such a CMake config with IDEs.
2. Native CMake support only worked with clang 16 while the fmt module can be built manually with clang 15.
3. It required the latest version of CMake and a lot of ceremony to set up, including some incomprehensible things.
4. There were issues in dynamic dependency extraction both in clang-scan-deps and CMake itself.

Hiring for C++ with Meeting C++

By Meeting C++ | Apr 21, 2023 02:24 AM | Tags: meetingcpp hiring community

A presentation on the results of the Meeting C++ online job fair in 2022 & 2023 and the plans for the next for May 9th & 10th

Hiring for C++ with Meeting C++

by Jens Weller

Video:

Functional Exception-less Error Handling with C++23’s Optional and Expected -- Sy Brand

By Blog Staff | Apr 20, 2023 01:15 PM | Tags: None

This post is an updated version of an article from five years ago, now that everything Sy talked about is in the standard and implemented in Visual Studio.

Functional Exception-less Error Handling with C++23’s Optional and Expected

by Sy Brand

From the article:

In software things can go wrong. Sometimes we might expect them to go wrong. Sometimes it’s a surprise. In most cases we want to build in some way of handling these misfortunes. Let’s call them disappointments.

std::optional was added in C++17 to provide a new standard way of expressing disappointments and more, and it has been extended in C++23 with a new interface inspired by functional programming.

C++23’s New Fold Algorithms -- Sy Brand

By Blog Staff | Apr 19, 2023 09:09 AM | Tags: None

This post explains the benefits of the new “rangified” algorithms, talks you through the new C++23 additions, and explores some of the design space for fold algorithms in C++.

C++23’s New Fold Algorithms

by Sy Brand

From the article:

C++20’s algorithms make several improvements to the old iterator-based ones. The most obvious is that they now can take a range instead of requiring you to pass iterator pairs. But they also allow passing a “projection function” to be called on elements of the range before being processed, and the use of C++20 concepts for constraining their interfaces more strictly defines what valid uses of these algorithms are. These changes allow you to make refactors like:

// C++17 algorithm
cat find_kitten(const std::vector<cat>& cats) {
    return *std::find_if(cats.begin(), cats.end(),
        [](cat const& c) { return c.age == 0; });
}

// C++20 algorithm
cat find_kitten(std::span<cat> cats) {
    return *std::ranges::find(cats, 0, &cat::age);
}