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Parallel STL And Filesystem: Files Word Count Example--Bartlomiej Filipek

By Adrien Hamelin | Jul 2, 2018 12:39 PM | Tags: performance c++17

Now with some more numbers.

Parallel STL And Filesystem: Files Word Count Example

by Bartlomiej Filipek

From the article:

Last week you might have read about a few examples of parallel algorithms. Today I have one more application that combines the ideas from the previous post.

We’ll use parallel algorithms and the standard filesystem to count words in all text files in a given directory...

Functions of Variants are Covariant--Alfredo Correa

By Adrien Hamelin | Jul 2, 2018 12:28 PM | Tags: c++17 advanced

It's varying!

Functions of Variants are Covariant

by Alfredo Correa

From the article:

Sum types have a range of values that is the sum of the ranges of its parts. std::variant is the model representation of sum types in C++.

For example std::variant can hold an integer value (int state) or a double value (double state). The use of variant types provides support for polymorphism while maintaining value semantics.

There are only a few intrinsic functions that can be applied directly to an std::variant instance in C++; basically, only functions that probe or extract their current type state and value. Simple C++ functions over its component states cannot be applied directly to the variant since the type information needs to be probed before calling the corresponding function over the correct type.

Specific C++ functions can be applied through visitors. However, standard visitors are static and non-covariant, stopping polymorphism from propagating through function application.

A basic explanation of variants and their visitors can be found here.

The surprisingly high cost of static-lifetime constructors--Arthur O’Dwyer

By Adrien Hamelin | Jun 27, 2018 12:13 PM | Tags: performance llvm

Today we look at compile time performance.

The surprisingly high cost of static-lifetime constructors

by Arthur O’Dwyer

From the article:

I was looking at HyperRogue again this week (see my previous post). It has a really nice localization framework: every message in the game can be translated just by adding a lookup entry to a single file (like, for the Czech translation, you add entries to language-cz.cpp); and then during the build process, all the language-??.cpp files are collated together and used to produce a single language-data.cpp file with a lookup table from each English message to the same message in every other language. (Seeing all the messages at once allows us to report on how “complete” each translation is, relative to the others.)...

 

The Tightly-constrained Design Space of Convenient Syntaxes For Generic Programming --Corentin Jabot

By Corentin Jabot | Jun 26, 2018 10:27 AM | Tags: None

An exploration of the various convenient syntaxes for declaring templates and function templates as proposed C++20:

The tightly-constrained design space of convenient syntaxes for generic programming

by Corentin Jabot

About the article:

Did you know that the Concept TS was merged into the Working Draft in July 2017, in Toronto? And we are a Planck length away from merging the Range TS in C++20 as well, including a few goodies such as projections, contiguous ranges/iterators and ranges adaptors? We also added a bunch of general-purpose concepts in the std namespace in Rapperswil.

Concepts have been 3 decades in the making and the Ranges TS is a huge body of work. Yet, I feel like a lot of people are unaware of these great features that are coming to a compiler near them.

Examples of Parallel Algorithms From C++17--Bartlomiej Filipek

By Adrien Hamelin | Jun 25, 2018 12:31 PM | Tags: performance c++17

Do you know them?

Examples of Parallel Algorithms From C++17

by Bartlomiej Filipek

From the article:

MSVC (VS 2017 15.7, end of June 2018) is as far as I know the only major compiler/STL implementation that has parallel algorithms. Not everything is done, but you can use a lot of algorithms and apply std::execution::par on them!

Have a look at few examples I managed to run...

Modern C++ for C programmers -- bert hubert

By bert hubert | Jun 25, 2018 12:57 AM | Tags: None

In 2018, C++ is a modern programming language that C programmers may want to take another look at, especially if they are pondering shifting to Go or Rust.

Modern C++ for C programmers part 1

Modern C++ for C programmers part 2

by Bert Hubert

From the article:

In this and subsequent posts, I hope to convince C programmers to give ‘2017 era C++’ (which is entirely unlike 2003 C++) another good look. To do so, I want to show that within C++ hides a simple language that still offers you many good things without immediately requiring you to tackle all 1400 pages of ‘The C++ Programming Language’. In other words, I claim there is great benefit already when only using a judicious selection of the best parts of C++.

My goal is that when you go look for a new language to learn (say, Go or Rust), you will hopefully consider modern C++ as well

 

C++17: Attributes--Marc Gregoire

By Adrien Hamelin | Jun 20, 2018 12:29 PM | Tags: intermediate c++17

Another new feature.

C++17: Attributes

by Marc Gregoire

From the article:

C++17 introduces three new code attributes:

  • [[fallthrough]]
  • [[maybe_unused]]
  • [[nodiscard]]

The first one was discussed in detail in my C++17: Fallthrough in switch statements blog post. The others are briefly explains below...