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Concise Result Extraction in Modern C++--David Gorski

By Adrien Hamelin | Mar 11, 2021 10:35 AM | Tags: c++17 advanced

Template magic.

Concise Result Extraction in Modern C++

by David Gorski

From the article:

A popular idiom in functional programming is the use of sum types to express results or optional values. When a function returns, it either succeeded and we get the result, or it failed and we have an error on our hands. This is a pattern in Modern C++ as well, enabled by standard library types such as std::variant and std::optional. In this article we will explore how to improve the ergonomics of handling multiple results and potential error values...

How std::any Works--Jonathan Boccara

By Adrien Hamelin | Feb 8, 2021 02:02 PM | Tags: advanced

Lambda magic.

How std::any Works

by Jonathan Boccara

From the article:

In the previous post we’ve seen a very nice technique to use value semantics with inheritance and virtual methods, which was made possible by std::any.

Given its usefulness, it would be interesting to better understand std::any. Indeed, std::any is sometimes said to be “the modern void*“. But it does much more than a void*...

Build Throughput Series: Template Metaprogramming Fundamentals--Xiang Fan

By Adrien Hamelin | Jan 18, 2021 01:09 PM | Tags: advanced

Optimise templates.

Build Throughput Series: Template Metaprogramming Fundamentals

by Xiang Fan

From the article:

Template metaprogramming is popular and seen in many code bases. However, it often contributes to long compile times. When investigating build throughput improvement opportunities in large codebases, our finding is that more than one million template specializations and template instantiations is quite common and often provides optimization opportunities for significant improvement.

In this blog post, I will walk through the differences between template specialization and template instantiation and how they are processed in the MSVC compiler...

4 Features of Boost HOF That Will Make Your Code Simpler--Jonathan Boccara

By Adrien Hamelin | Jan 18, 2021 01:02 PM | Tags: c++11 advanced

Convinced?

4 Features of Boost HOF That Will Make Your Code Simpler

by Jonathan Boccara

From the article:

Boost HOF, standing for Higher Order Functions, is a Boost library offering functions that work on functions.

This impressive library provides a lot of advanced components allowing to go a step further into functional programming in C++. In this post, we’ll focus on 4 of the more basic ones (+ a bonus one) that allow to make code simpler in common tasks.

HOF provides one header in the form of #include <boost/hof/XXX.hpp> for each component, as well as a general header #include <boost/hof.hpp>. It is compatible with C++11...

One Trick with Private Names and Function Templates--Bartlomiej Filipek

By Adrien Hamelin | Jan 4, 2021 12:12 PM | Tags: advanced

Will you use it?

One Trick with Private Names and Function Templates

by Bartlomiej Filipek

From the article:

Last time in my blog post about How to Share Code with Const and Non-Const Functions in C++ I had a custom type declared and defined in one place (like in a header file). Recently, I tried to separate the declaration from implementation, and I got into a situation where one private function template was left.

In this article, I’d like to show you one trick that allowed me to convert this function template into a non-member function without giving up private details of the class...

Interactive C++ for Data Science--Vassil Vassilev, David Lange, Simeon Ehrig, Sylvain Corlay

By Adrien Hamelin | Jan 4, 2021 12:07 PM | Tags: community advanced

Helping research.

Interactive C++ for Data Science

by Vassil Vassilev, David Lange, Simeon Ehrig, Sylvain Corlay

From the article:

In our previous blog post “Interactive C++ with Cling” we mentioned that exploratory programming is an effective way to reduce the complexity of the problem. This post will discuss some applications of Cling developed to support data science researchers. In particular, interactively probing data and interfaces makes complex libraries and complex data more accessible users. We aim to demonstrate some of Cling’s features at scale; Cling’s eval-style programming support; projects related to Cling; and show interactive C++/CUDA...

Under the Covers of C++ Lambdas: Captures, Captures, Captures--Andreas Fertig

By Adrien Hamelin | Nov 30, 2020 01:05 PM | Tags: advanced

Lambdas.

Under the Covers of C++ Lambdas: Captures, Captures, Captures

by Andreas Fertig

From the article:

Lambda Capturing syntax allows us to quickly “wrap” a variable from the outside scope and then use it in the lambda body. We also know that under the hood the compiler translates lambda into a closure type… but what happens to those captured variables? Are they translated to public data members or private? See the newest guest post from Andreas to understand this tricky problem...