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January 2019

CopperSpice: Inheritance

By Ansel Sermersheim | Jan 18, 2019 12:10 PM | Tags: None

New video on the CopperSpice YouTube Channel:

Inheritance

by Barbara Geller and Ansel Sermersheim

About the video:

In this video, we look at the full variety of inheritance mechanisms that C++ provides. The C++ object model allows several different types of inheritance relationships, both single and multiple, as well as support for composition. Some of the terminology around these inheritance relationships can be quite confusing, and we present some best practices for avoiding miscommunication and misunderstandings. We address questions of how these features interact and why you would choose one type of inheritance over another.

Please take a look and remember to subscribe!

Exploring C++20 - Class Types in Non-Type Template Parameters--Tobias Widlund

By Adrien Hamelin | Jan 17, 2019 01:31 PM | Tags: experimental

Exciting!

Exploring C++20 - Class Types in Non-Type Template Parameters

by Tobias Widlund

From the article:

If I had to pick out my favourite features planned for C++20, then this one would definitely be amongst the top 5 since I love compile time programming. This feature makes it more natural to write templated code since it allows you to group data together and pass it to a template without having to resort to hacks.

To explain what this feature is about, I will start by talking about normal non-type template parameters from pre-C++20...

The pImpl Idiom--Arne Mertz

By Adrien Hamelin | Jan 17, 2019 01:24 PM | Tags: intermediate community

In one word.

The pImpl Idiom

by Arne Mertz

From the article:

The pImpl idiom is a useful idiom in C++ to reduce compile-time dependencies. Here is a quick overview of what to keep in mind when we implement and use it...

Don’t pass lambdas (or other multi-line entities) as parameters to macros--Raymond Chen

By Adrien Hamelin | Jan 17, 2019 01:20 PM | Tags: basics

Not helping you.

Don’t pass lambdas (or other multi-line entities) as parameters to macros

by Raymond Chen

From the article:

Consider this macro:

#ifdef DEBUG
#define LOG(value) LogValue(value)
#else
// In production, evaluate but don't log.
#define LOG(value) (value)
#endif

This seems not entirely unreasonable, but bad things happen if you pass a multi-line entity as the macro parameter...

Move smart pointers in and out functions in modern C++

By triangles | Jan 17, 2019 12:51 PM | Tags: None

Different options with different meanings.

Move smart pointers in and out functions in modern C++

by Triangles @ Internal Pointers

From the article:

Passing and returning smart pointers to/from functions are operations that require some planning. There are many ways of doing it and picking the right one is not always straightforward. Luckily for us C++ experts have guidelines that shed some light on this task.

Modern dining philosophers -- Lucian Radu Teodorescu

By Lucian Radu Teodorescu | Jan 17, 2019 12:50 PM | Tags: None

How to solve the dining philosophers problem in 2018? By using tasks. And how to use tasks? Read on...

Modern dining philosophers

by Lucian Radu Teodorescu

From the article:

We give several solutions to the dining philosophers problem, each with some pros and cons. But, more importantly, we walk the reader through the most important aspects of using tasks to solve concurrency problems.

Instead of reaching for our higher-level frameworks, we opted to keep the level of abstractions as close as possible to raw tasks. This way, we hope to guide the reader to understand more about the essence of task-based programming. Our aim is to make the reader comprehend the machinery of composing tasks; those skills should be highly valuable.

The overview of C++20 Range view--Ryou Ezoe

By Adrien Hamelin | Jan 14, 2019 02:03 PM | Tags: experimental

Simple, good.

The overview of C++20 Range view

by Ryou Ezoe

From the article:

The latest C++ draft at the time of writing incorporated The One Ranges Proposal.

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/n4791.pdf

So what is a Range, anyway? The C++ Standard Comittee member, Eric Niebler, summarised it well in this article:

Eric Niebler – Eric Niebler

Actually, he summarised it all too well to the point that his code became almost unreadable to an average C++ programmer. One might say, it's practically useless. So this article serves as a quick tutorial for the Range view...