By Adrien Hamelin | Apr 3, 2019 11:50 AM | Tags: community
No need to do them yourself.
The BooSTL Algorithms: Boost Algorithms That Extend the STL (1/3)
by Jonathan Boccara
From the article:
The STL features a proud 105 algorithms, but that is by no means all the algorithms there is in C++.
There are many ways to extend the STL. One of them is to include the STL-like algorithms that are in Boost, which I like to call the BooSTL algorithms!
By Adrien Hamelin | Mar 27, 2019 12:56 PM | Tags: community
What do you use?
object_ptr - a safer replacement for raw pointers
by Anthony Williams
From the article:
Yesterday I uploaded my object_ptr<T> implementation to github under the Boost Software License...
By Adrien Hamelin | Mar 26, 2019 10:43 AM | Tags: experimental community
Everything you need to know.
Trip Report: C++ Standards Meeting in Kona, February 2019
by Botond Ballo
From the article:
A few weeks ago I attended a meeting of the ISO C++ Standards Committee (also known as WG21) in Kona, Hawaii. This was the first committee meeting in 2019; you can find my reports on 2018’s meetings here (November 2018, San Diego), here (June 2018, Rapperswil), and here (March 2018, Jacksonville). These reports, particularly the San Diego one, provide useful context for this post...
By Adrien Hamelin | Mar 21, 2019 12:19 PM | Tags: community basics
Their usefulness dwindles with time.
Macro Evil in C++ Code
by Andrey Karpov
From the article:
The C++ language opens extensive opportunities to go without macros. So let’s try to use macros as seldom as possible!
By Adrien Hamelin | Mar 21, 2019 12:16 PM | Tags: intermediate c++14
Quick A: each release of C++ allows more things to be done at compile time.
Recently on SO:
Compile-time loop optimisation
In C++14, constexpr function requirements were relaxed.
Previously, in C++11, constexpr functions could only contain typedefs, static_asserts and usings, but only a single return statement.
In C++14, it became possible to use loops in constexpr function bodies.
Because b was declared as constexpr char, it must be evaluated at compile time. The compiler then optimised out the isStringNice function, as it is not used at run time.
By Adrien Hamelin | Mar 20, 2019 12:39 PM | Tags: None
Simple but effective.
How do I design a class so that methods must be called in a certain order?
by Raymond Chen
From the article:
Suppose you have a class with some methods, and the methods must be called in a certain order. For example, suppose your class is for importing photos from a camera. First, you have to specify which camera you are importing from. Then you discover the pictures. Then you have to select which pictures you want to import, and set the options for how you want the download to occur. And finally, you download them...
By Adrien Hamelin | Mar 20, 2019 12:25 PM | Tags: intermediate community
A good tool!
C++ Insights - Implicit Conversions
by Andreas Fertig
From the article:
This series is motivated by a brief conversation I had with Andreas. I asked him if he has some use case examples which show how C++ Insights can be helpful when teaching. I think there are many things. This article is the start of a series of five posts by Andreas which I will publish at Modernes C++ because I think C++ Insights is an invaluable tool to get a deeper insight in the C++ compiler magic. In case, you are new to C++ Insights consider this introductory article. Without further ado, Andreas post. When you follow the link near to each example, you can directly analyse the example in C++ Insight...
By Adrien Hamelin | Mar 20, 2019 12:21 PM | Tags: intermediate c++11
Quick A: The meaning is the same for the compiler, so chooses what make sense to you.
Recently on SO:
Deletion of copy-ctor & copy-assignment - public, private or protected?
I would put them in the public section.
This is because deleting a constructor or an assignment operator is orthogonal to making them private / protected; and when these aren't deleted, they are public. Putting the deletions in one of those two sections seems to me like hinting "If I hadn't deleted them, I would have made them private/protected" - which is not a message you want to convey in your case.
Note, though, that the compiler doesn't care which section you put the deletion in.
By Andrey Karpov | Mar 20, 2019 10:53 AM | Tags: macros bugs
The C++ language opens extensive opportunities to go without macros. So let’s try to use macros as seldom as possible!
Macro Evil in C++ Code
by Andrey Karpov
From the article:
The ATL library provides such macros, as A2W, T2W and so on for string conversion. However, few people know that it is very dangerous to use these macros inside loops. Within the macro, a call to the alloca function occurs, which will repeatedly allocate memory on each loop iteration on the stack. A program makes show that it works correctly. Once a program starts to handle longer strings and the number of loop iterations increases, the stack can just end at the most unexpected moment.
By Adrien Hamelin | Mar 19, 2019 11:44 AM | Tags: c++17 advanced
Templates are great.
Template meta-functions for detecting template instantiation
by Ivan Čukić
From the article:
I’ve been playing around with type meta-tagging for my Voy reactive streams library (more on that some other time) and realized how useful it is to be able to check whether a given type is an instantiation of some class template, so I decided to write a short post about it...