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Simplify Your Code With Rocket Science: C++20’s Spaceship Operator--Cameron DaCamara

By Adrien Hamelin | Jul 2, 2019 12:26 PM | Tags: experimental efficiency

Exited?

Simplify Your Code With Rocket Science: C++20’s Spaceship Operator

by Cameron DaCamara

From the article:

C++20 adds a new operator, affectionately dubbed the “spaceship” operator: <=>. There was a post awhile back by our very own Simon Brand detailing some information regarding this new operator along with some conceptual information about what it is and does.  The goal of this post is to explore some concrete applications of this strange new operator and its associated counterpart, the operator== (yes it has been changed, for the better!), all while providing some guidelines for its use in everyday code.

The Power of Hidden Friends in C++--Anthony Williams

By Adrien Hamelin | Jun 26, 2019 11:31 AM | Tags: advanced

Did you know about them?

The Power of Hidden Friends in C++

by Anthony Williams

From the article:

"Friendship" in C++ is commonly thought of as a means of allowing non-member functions and other classes to access the private data of a class. This might be done to allow symmetric conversions on non-member comparison operators, or allow a factory class exclusive access to the constructor of a class, or any number of things.

However, this is not the only use of friendship in C++, as there is an additional property to declaring a function or function template a friend: the friend function is now available to be found via Argument-Dependent Lookup (ADL). This is what makes operator overloading work with classes in different namespaces...

Space Game: A std::variant-Based State Machine by Example--Nikolai Wuttke

By Adrien Hamelin | Jun 25, 2019 12:26 PM | Tags: c++17

Did you think to use it like that?

Space Game: A std::variant-Based State Machine by Example

by Nikolai Wuttke

From the article:

One of a powerful uses of std::variant is to implement State Machines. Some time ago I showed a simple example, but today we have something bigger. In today’s article by Nikolai Wuttke you’ll see how to leverage std::variant and build a space game!

A simple workaround for the fact that std::equal takes its predicate by value--Raymond Chen

By Adrien Hamelin | Jun 24, 2019 01:19 PM | Tags: intermediate

Simple and efficient.

A simple workaround for the fact that std::equal takes its predicate by value

by Raymond Chen

From the article:

The versions of the std::equal function that takes a binary predicate accepts the predicate by value, which means that if you are using a functor, it will be copied, which may be unnecessary or unwanted.

In my case, the functor had a lot of state, and I didn’t want to copy it....

Generic Interfaces with Generic Lambdas using C++ for SYCL -- Georgi Mirazchiyski

By rodburns | Jun 14, 2019 12:03 PM | Tags: None

This blog post offers a generic description of using lambdas in C++ and how it's possible to use them with SYCL, an open standard interface for programming heterogeneous hardware using C++.

Generic Interfaces with Generic Lambdas using C++ for SYCL

by Georgi Mirazchiyski

From the article:

C++ Lambdas, first introduced in C++11, are an important part of the way that the SYCL standard is defined and implemented. SYCL is required to handle different types and pass around functions so lambdas are a good fit allowing anonymous function objects to be passed to SYCL kernels. We talk about how we use lambdas in our guides and documentation, but never about how lambdas work or even how to use them in SYCL, so in this blog post we will examine how they can be used in SYCL.