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By Adrien Hamelin | Jan 31, 2018 07:12 PM | Tags: intermediate community
A classic error:
break and fallthrough
by Andrey Karpov
From the article:
We would like to suggest reading the series of articles dedicated to the recommendations on writing code of high quality using the examples of errors found in the Chromium project. This is the second part, which will be devoted to the switch operator and, more precisely, to the problem of a forgotten break operator...
By Adrien Hamelin | Jan 29, 2018 06:31 PM | Tags: intermediate
Interesting indeed!
Guidelines for constructor and cast design
by Jonathan Müller
From the article:
A while back — but sadly not too many blog posts ago — I wrote about explicit constructors and how to handle assignment. In this blog post, I made the assumption that you most likely want to have explicit single argument constructors.
But when do we actually want implicit single argument constructors?
Let’s consider the broader question: How should I design a cast operation for my user-defined type? And how should I design a constructor?
But first, something different: what is the difference between a cast and a constructor?
By Adrien Hamelin | Jan 29, 2018 06:29 PM | Tags: performance community
Isn't that a good question?
Do compilers take inline as a hint?
by Simon Brand
From the article:
If you’ve spent any time in C or C++ communities online, you’ve probably seen someone say this:
inline used to be a hint for compilers to inline the definition, but no compilers actually take that into account any more.
You shouldn’t believe everything you see on the internet...
By fj | Jan 28, 2018 03:47 AM | Tags: None
Synchronisation cost minimisation technique explained based on the classic producer-consumer problem.
Lock less with swapped buffers
by Krzysztof Ostrowski
From the article:
Presented approach keeps the shared resource synchronised, but unblocks the producer execution for the time of the buffer items' consumption to achieve significant gain in overall performance of the solution and its reliability.
By shreck | Jan 26, 2018 12:48 AM | Tags: None
Abseil's C++ Tips of the Week for January 26th
Abseil's String Utility APIs
by Tom Manshreck, Abseil Tech Writer
About the article:
Abseil provides many important string utilities such as
StrCat(),StrSplit()andStrJoin(). Read the tips that introduced these APIs at Google and explain how to use them now at https://abseil.io/tips/3 https://abseil.io/tips/10 , https://abseil.io/tips/36 and https://abseil.io/tips/59.
By Adrien Hamelin | Jan 24, 2018 06:38 PM | Tags: c++17 basics
Small reminder:
C++17: Initializers for if & switch statements
by Marc Gregoire
From the article:
Two small, but very useful C++17 features are initializers for if and switch statements. These can be used to prevent polluting the enclosing scope with variables that should only be scoped to the if and switch statement. The for statement already supports such initializers since the beginning...
By Adrien Hamelin | Jan 24, 2018 06:34 PM | Tags: basics
Quick A: This is not a valid statement.
Recently on SO:
Is (4 > y > 1) a valid statement in C++? How do you evaluate it if so?
The statement (4 > y > 1) is parsed as this:
((4 > y) > 1)The comparison operators < and > evaluate left-to-right.
The 4 > y returns either 0 or 1 depending on if it's true or not.
Then the result is compared to 1.
In this case, since 0 or 1 is never more than 1, the whole statement will always return false.
By Alex Marmer | Jan 19, 2018 05:55 AM | Tags: c++14
Thiticle describes how metaprogramming can be used in a recursive lambda function.
by Alex Marmer
About the article:
Alex gives in his article several examples how lambda expressions can be used in TMP
By bfilipek | Jan 17, 2018 12:56 PM | Tags: None
In the article we describe how to limit compilation dependencies. Two methods are discussed: pimpl approach and via abstract interfaces
Pimpl vs Abstract Interface - a practical tutorial
by Bartlomiej Filipek
From the article:
In the post I covered the pimpl pattern. I discussed the basic structure, extensions, pros and cons and alternatives. Still, the post might sound a bit “theoretical”. Today I’d like to describe a practical usage of the pattern. Rather than inventing artificial names like MyClass and MyClassImpl you’ll see something more realistic: like FileCompressor or ICompressionMethod.
By bfilipek | Jan 11, 2018 03:00 PM | Tags: None
Tricky weak_ptr and shared_ptr interaction:<img alt="" data-cke-saved-src="https://2.bp.blogspot.com/-2XIQxeCUBFc/Wi2JGz_EcXI/AAAAAAAADNU/vEkN6ZtXR-Yon5YuZWBxk-6kjmHD1011ACLcBGAs/s1600/control_block.png" src="https://2.bp.blogspot.com/-2XIQxeCUBFc/Wi2JGz_EcXI/AAAAAAAADNU/vEkN6ZtXR-Yon5YuZWBxk-6kjmHD1011ACLcBGAs/s1600/control_block.png" right;"="" style="float: right; width: 230px; height: 199px;">
How a weak_ptr might prevent full memory cleanup of managed object
by Bartlomiej Filipek
From the article:
It appears that in some cases memory allocated for the object controlled by smart_ptr might not be released until all weak pointers are also ‘dead’.