Should Span Be Regular?--Barry Revzin

By Adrien Hamelin | May 23, 2018 12:54 PM | Tags: advanced

Do you have an opinion?

Should Span Be Regular?

by Barry Revzin

From the article:

In my last post, I talked about the concept of Westie types (yes, I am trying to make this happen), what Regular means, and which of them are Regular. I went through an explanation for why means for span is not Regular and potentially why it should be. After lots of resulting conversations with several people (thanks Zach Laine, Nicole Mazzuca, Eric Niebler, John Shaw, Tim Song), I thought it was necessary to write a follow up with more details and more argument...

C++: On Using int*_t as Overload and Template Parameters--No Bugs" Hare

By Adrien Hamelin | May 23, 2018 12:49 PM | Tags: advanced

Do you have that problem?

C++: On Using int*_t as Overload and Template Parameters

by No Bugs" Hare

From the article:

In C++, there is a concept of “two types being the same”. I am a Big Fan(tm) of this concept and find it very useful, but sometimes it starts causing trouble. Here is one such example – and a way I am using to deal with it...

Stupid C++ namespace tricks--Raymond Chen

By Adrien Hamelin | May 22, 2018 01:32 PM | Tags: intermediate

Stupid but useful.

Stupid C++ namespace tricks

by Raymond Chen

From the article:

These tricks may be obvious, but at least I'm going to write them down...

Rvalues redefined--Andrzej Krzemieński

By Adrien Hamelin | May 22, 2018 01:10 PM | Tags: c++17 advanced

Evolution of semantics.

Rvalues redefined

by Andrzej Krzemieński

From the article:

In this post we will explore what I consider the most significant language change in C++17. I call it the most significant because it changes the way you design your resource-managing types and how you think about initialization. It is often called “guaranteed copy elision”, but I will not use that name (except for this single time) because it does not reflect what this feature is. C++ has completely changed the meaning of rvalue (actually, prvalue)...

std::accumulate vs. std::reduce--Simon Brand

By Adrien Hamelin | May 22, 2018 01:04 PM | Tags: stl intermediate

Old vs new.

std::accumulate vs. std::reduce

by Simon Brand

From the article:

std::accumulate has been a part of the standard library since C++98. It provides a way to fold a binary operation (such as addition) over an iterator range, resulting in a single value. std::reduce was added in C++17 and looks remarkably similar. This post will explain the difference between the two and when to use one or the other...

Overload: Build a Variant Visitor on the Fly--Arne Mertz

By Adrien Hamelin | May 21, 2018 12:19 PM | Tags: intermediate c++17

Make our life simpler.

Overload: Build a Variant Visitor on the Fly

by Arne Mertz

From the article:

Having written about std::variant and std::visit last week, it’s time to string together some modern C++ features to build a naive basic implementation of overload, a proposed C++ feature...

How to Make SFINAE Pretty – Part 2: the Hidden Beauty of SFINAE--Jonathan Boccara

By Adrien Hamelin | May 21, 2018 12:17 PM | Tags: advanced

The next part.

How to Make SFINAE Pretty – Part 2: the Hidden Beauty of SFINAE

by Jonathan Boccara

From the article:

As we’ve seen in How to Make SFINAE Pretty – Part 1: What SFINAE Brings to Code, SFINAE in code is as pretty as a windmill in a field. That is, not very pretty.

But like a windmill, it’s useful. SFINAE helps deactivate a piece of template code depending on a condition, and that can be very convenient...

How to Make SFINAE Pretty – Part 1: What SFINAE Brings to Code

By Adrien Hamelin | May 21, 2018 12:16 PM | Tags: advanced

New series!

How to Make SFINAE Pretty – Part 1: What SFINAE Brings to Code

by Jonathan Boccara

From the article:

SFINAE is a bit like a windmill. It sits as a wart in the middle of an interface, BUT it’s useful to create elaborate static polymorphism, in particular before C++17 and if constexpr, and even in some use cases in C++17.

I thought we had to live with this tradeoff, until I watched a talk from Stephen Dewhurst at CppCon. In this inspring talk, Stephen shows how to turn SFINAE around to make it very expressive in an interface. Watching this talk changed my way of coding template interfaces...

CopperSpice: C++ Tapas (typename, virtual, pure virtual)

By Ansel Sermersheim | May 18, 2018 12:41 PM | Tags: None

New video on the CopperSpice YouTube Channel:

C++ Tapas: typename, virtual, and pure virtual

by Barbara Geller and Ansel Sermersheim

About the video:

Continuing our C++ Tapas series, we discuss the typename keyword, where it is used, and what it means. We also talk about the use and meaning of virtual and pure virtual methods.

Please take a look and remember to subscribe!

Default-constructibility is overrated--Arthur O’Dwyer

By Adrien Hamelin | May 18, 2018 11:19 AM | Tags: community advanced

What do you think?

Default-constructibility is overrated

by Arthur O’Dwyer

From the article:

The Ranges Technical Specification includes very many concept definitions (based on the Concepts TS), including for example Integral and Predicate. It also provides a concept named Regular which implements a variation on the “Regular” concept described by Alexander Stepanov in his paper '’Fundamentals of Generic Programming’’ (1998)...