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By Adrien Hamelin | Jul 18, 2018 12:12 AM | Tags: intermediate
Efficient construction.
In-Place Construction for std::any, std::variant and std::optional
by Bartlomiej Filipek
From the article:
When you read articles or reference pages for std::any, std::optional or std::variant you might notice a few helper types called in_place_* available in constructors.
Why do we need such syntax? Is this more efficient than “standard” construction?
By Adrien Hamelin | Jul 18, 2018 12:07 AM | Tags: advanced
To be const or not?
The Incredible Const Reference That Isn’t Const
by Jonathan Boccara
From the article:
While working on the NamedType library I came across a situation that left me stunned in bewilderment: a const reference that allows modification of the object it refers to. Without a const_cast. Without a mutable. Without anything up the sleeve.
How can this be? And how to enforce the const in that const reference?
By Nico Josuttis | Jul 16, 2018 12:59 PM | Tags: c++17
The latest update of "C++17 - The Complete Guide" now contains a detailed description of the whole new C++17 filesystem library.
Example Code
by Nico Josuttis
About the extension:
50 pages about all elements, all differences between POSIX/Linux and Windows, many examples, many tricks, traps, and hints as well as what changed with the library when it became part of C++17.
All examples were tested both with Visual C++ and g++.
By Lucian Radu Teodorescu | Jul 9, 2018 01:31 PM | Tags: None
Ever wondered how the compiler generates code for your types?
Beyond the Type System
by Lucian Radu Teodorescu
From the article:
Often when we consider a type system we think about a complex formalism to denote the semantics of a language. Languages typically add features by increasing the complexity of the type system.
But there is also another perspective on the type system: how does the generated code look like? what is the ABI for the code that uses different features of the type system? We’ll try to explore this perspective in this blog post.
By onqtam | Jul 9, 2018 01:28 PM | Tags: None
A unity build can cut down build times dramatically and is HIGHLY underrated and easily dismissed by many senior software engineers.
Everything about unity builds
by Viktor Kirilov
From the article:
In this post we will go over what it is, all its pros and cons, and why a “dirty hack” might be worth it if it speeds up your builds by at least a factor of 2 or perhaps even in the double-digits.
By Adrien Hamelin | Jul 9, 2018 01:23 PM | Tags: community
It's getting closer.
CppCon 2018 Call for Poster Submissions
by Bob Steagall
From the article:
Are you doing something really cool with C++? We want you to share it with the C++ community by creating a poster and presenting it at CppCon 2018.
By Marco Arena | Jul 9, 2018 06:52 AM | Tags: advanced
The Standard reserves the right to change the signatures and overloads of the existing Standard Library functions in what is considered a backward compatible way:
Functions in std
by Andrzej Krzemieński
From the article:
Names of functions from the Standard Library used as pointers/references to functions can cause breakage in your code...
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...
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.
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.)...