By Adrien Hamelin | Oct 3, 2017 11:15 AM | Tags: community basics
A wonderful tale to read.
A Beginner's Guide to CPPCon 2017
by Eva "Bunny" Conti
From the article:
When we last left our heroine, she was just stating that although she'd be accompanying Ben to Seattle for his talk at CPPCon 2017, she wouldn't be attending the actual conference...
By Adrien Hamelin | Oct 2, 2017 12:23 PM | Tags: community
It's over, but we still have reports!
#CPPCON2017. Day 4. Async Rulezzz!
by "No Bugs" Hare
From the article:
During the Day 4 of CPPCON, I had to prepare to my own talk tomorrow; still – I was able to attend all the talks I was interested in.
But before I can start – let’s discuss a thing which I just understood during CPPCON17; it is related to…
By Adrien Hamelin | Sep 28, 2017 11:07 AM | Tags: community
The series continues.
#CPPCON2017. Day 3. The Future of C++
by "No Bugs" Hare
From the article:
At #CPPCON2017 Day 3, I spent most of the time on the meetings of SG14 (on games and low-latency stuff); while it was certainly useful for me – the most interesting things on Day 3 happened outside of SG14.
By Adrien Hamelin | Sep 27, 2017 12:46 PM | Tags: community
The conference continues!
#CPPCON2017. Day 2. Why Local Allocators are a Good Thing(tm) Performance-Wise, and Why I am Very Cautious about C++17 STL parallelized algos
by "No Bugs" Hare
From the article:
At CPPCON2017 Day 2, two talks were of special interest to me. One was a 2-hour talk about Local Allocators – and another about C++17 STL parallelised algorithms.
By Adrien Hamelin | Sep 26, 2017 12:53 PM | Tags: community
Cppcon continues!
#CPPCON2017. Day 1. Hope to get something-better-than-chevron-hell
by "No Bugs" Hare
From the article:
IMO, the most important thing which has happened on Day 1 was a series of discussions about potential replacement for overloaded operator << in iostreams <yay! />.
By Jordi Mon Companys | Sep 26, 2017 12:35 PM | Tags: community
The Faraday Medal is awarded for conspicuous service rendered to the advancement of science, engineering and technology:
Bjarne Stroustrup awarded 2017 Faraday Medal
by Institution of Engineering and Technology
From the article:
“I am honored and humbled to see my name among so many illustrious previous winners of the prize,” said Stroustrup. “This privilege is only possible through the superb work of the C++ community.”
By Adrien Hamelin | Sep 25, 2017 01:41 PM | Tags: community
The new Cppcon is here!
CPPCON2017 Day 0: IMO best posters
by "No Bugs" Hare
From the article:
Very short report from day 0 of CPPCON2017. Registration reception was lively (with Gor Nishanov being the star of the show, but lots of the other interesting people were noticed, I even spotted <da-dum /> Bjarne Himself).
By Thomas Young | Sep 25, 2017 04:50 AM | Tags: basics
An article about static libraries, the benefits (or non-benefits) of splitting your project into static libraries, and the knock-on effects this can have on project dependencies.
Static libs do not modular make
by Thomas Young
From the article:
A cautionary tale about statically-linked libraries, as generated by C/C++ build tools.
As a project accumulates features, and complexity, it gets harder to understand exactly what's going on, and to find your way around the source code. You need to find some way to organise the code and try and keep things manageable.
A common idea, in this situation, is to group some source files together to split out as a static library.
I'm going to argue that this actually does very little, in itself, to increase modularity, can have the effect of significantly increasing dependencies, and is maybe not such a good idea, after all.
By Adrien Hamelin | Sep 20, 2017 12:36 PM | Tags: intermediate c++17
Quick A: A solution for automatic template resolution on constructors.
Recently on SO:
What are template deduction guides in C++17?
Template deduction guides are patterns associated with a template class that tell the compiler how to translate a set of parameter (and their types) into template arguments.
The simplest example is that of std::vector and its constructor that takes an iterator pair.
template<typename Iterator> void func(Iterator first, Iterator last) { vector v(first, last); }The compiler needs to figure out what vector<T>'s T type will be. We know what the answer is; T should be typename std::iterator_traits<Iterator>::value_type. But how do we tell the compiler without having to type vector<typename std::iterator_traits<Iterator>::value_type>?
You use a deduction guide:
template<typename Iterator> vector(Iterator b, Iterator e) -> vector<typename std::iterator_traits<Iterator>::value_type>;This tells the compiler that, when you call a vector constructor matching that pattern, it will deduce the vector specialization using the code on the right of ->.
You need guides when the deduction of the type from the arguments is not based on the type of one of those arguments. Initializing a vector from an initializer_list explicitly uses the vector's T, so it doesn't need a guide.
The left side doesn't necessarily specify a constructor. The way it works is that, if you use template constructor deduction on a type, it matches the arguments you pass against all deduction guides (actual constructors provide implicit guides). If there is a match, it uses that to determine which template arguments to provide to the type. But overload resolution to determine which constructor to call happens after that.
This also means that you can use guides with aggregates and aggregate initialization:
template<typename T> struct Thingy { T t; }; Thingy(const char *) -> Thingy<std::string>; Thingy thing{"A String"}; //thing.t is a `std::string`.So deduction guides are only used to figure out the type being initialized. The actual process of initialization works exactly as it did before, once that determination has been made.
By Adrien Hamelin | Sep 20, 2017 12:30 PM | Tags: c++14 advanced
Detection Idiom - A Stopgap for Concepts
by Simon Brand
From the article:
Concepts is a proposed C++ feature which allows succinct, expressive, and powerful constraining of templates. They have been threatening to get in to C++ for a long time now, with the first proposal being rejected for C++11. They were finally merged in to C++20 a few months ago, which means we need to hold on for another few years before they’re in the official standard rather than a Technical Specification. In the mean time, there have been various attempts to implement parts of concepts as a library so that we can have access to some of the power of Concepts without waiting for the new standard. The detection idiom – designed by Walter Brown and part of the Library Fundamentals 2 Technical Specification – is one such solution. This post will outline the utility of it, and show the techniques which underlie its implementation.