February 10-15, Hagenberg, Austria
March 19-21, Madrid, Spain
April 1-4, Bristol, UK
June 16-21, Sofia, Bulgaria
By Adrien Hamelin | Mar 26, 2019 10:45 AM | Tags: community
The series continues.
Expressing fire-and-forget coroutines more explicitly, -or- How to turn any coroutine into fire-and-forget
by Raymond Chen
From the article:
Last time, we looked at how to mark a coroutine as fire-and-forget, meaning that the caller does not get any information about when the coroutine completes. This is fine as far as it goes, but it may not be what you want...
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 26, 2019 10:39 AM | Tags: community
Heard about it?
winrt::fire_and_forget was too forgetful
by Raymond Chen
From the article:
C++/WinRT provides a handy helper class called winrt::fire_and_forget. It lets you specify that nobody is going to observe the result of the coroutine. This is handy because it lets you tell the compiler that the lack of observation is intentional, so it won’t generate a warning...
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 21, 2019 12:03 PM | Tags: performance community
Getting better!
Game performance and compilation time improvements in Visual Studio 2019
by Gratian Lup
From the article:
The C++ compiler in Visual Studio 2019 includes several new optimizations and improvements geared towards increasing the performance of games and making game developers more productive by reducing the compilation time of large projects. Although the focus of this blog post is on the game industry, these improvements apply to most C++ applications and C++ developers...
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.