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By Adrien Hamelin | Jun 7, 2021 12:23 PM | Tags: None
Get some ideas of the possibilities.
How to Filter Elements - the Talk and Optimizations
by Bartlomiej Filipek
From the article:
Two weeks ago, 20th May, I had a pleasure to talk about filtering elements on our Cracow C++ User Group online meeting.
Here are the slides and additional comments from the presentation...
By Adrien Hamelin | Jun 7, 2021 12:14 PM | Tags: intermediate
Quick A: the better match is picked, and an error generated if there none.
Recently on SO:
Overload resolution between object, rvalue reference, const reference
As there is only one parameter, the rule is that one of the three viable parameter initializations of that parameter must be a better match than both the other two. When two initializations are compared, either one is better than the other, or neither is better (they are indistinguishable).
Without special rules about direct reference binding, all three initializations mentioned would be indistinguishable (in all three comparisons)...
By Blog Staff | Jun 3, 2021 10:55 AM | Tags: None
Solution just posted:
GotW #102 Solution: Assertions and "UB"
by Herb Sutter
From the article:
Now that we have considered assertions, postconditions, and preconditions in GotWs #97-101, let’s pause and reflect: To what extent does a failed contract imply "UB"... either the Hidden Dragon of Undefined Behavior, or the Crouching Tiger of Unspecified Behavior?
By Adrien Hamelin | May 31, 2021 02:36 PM | Tags: intermediate
How do you do it?
How to Insert Several Elements in a Vector (With No Memory Errors)
by Jonathan Boccara
From the article:
Inserting elements in a vector sounds like the most basic use case we can think of when it comes to using collections in C++.
Nevertheless, this is a complex topic in itself, because std::vector offers various ways to insert several elements. Choosing the most appropriate depending on your exact use case allows to write more expressive code. And misusing the interface of std::vector can lead to memory errors.
Let’s navigate the various ways to insert several elements in a vector in a safe way, so that you can choose the one that fits best for your code...
By Adrien Hamelin | May 31, 2021 02:30 PM | Tags: performance
The evolution.
Compile-time pre-calculations in C++
by Mohammad Nasirifar
From the article:
With C++17’s constexpr functions and C++20’s consteval specifier, it is easy to do io-independent pre-calculations of algorithms while compiling the program. This may not be useful or even possible in long running programs and is unlikely to make a difference in their performance, but in binaries that do short calculations with a set of parameters fixed at compile-time, a Sieve of Eratosthenes array, or roots of unity used for calculating DFT loaded right from the binary could make a difference...
By Adrien Hamelin | May 31, 2021 02:23 PM | Tags: community
Did you know about those reasons?
East End Functions
by Phil Nash
From the article:
There has been a recent stirring of attention, in the C++ community, for the practice of always placing the const modifier to the right of the thing it modifies. The practice has even been gifted a catchy name: East Const (which, I think, is what has stirred up the interest)...
By Adrien Hamelin | May 28, 2021 01:30 PM | Tags: basics
The series continue.
Class Templates
by Rainer Grimm
From the article:
A function template represents a family of functions. Accordingly, a class template represents a family of classes. Today, I want to introduce class templates...
By Adrien Hamelin | May 26, 2021 01:27 PM | Tags: c++11
You've been warned.
The Subtle Dangers of Temporaries in for Loops
by Jonathan Boccara
From the article:
Even though very convenient to write concise code, temporaries are an endless source of bugs in C++.
Are we allowed to use a temporary in a range based for loop?
By Adrien Hamelin | May 24, 2021 12:16 PM | Tags: intermediate
The series continue.
Function Templates - More Details about Explicit Template Arguments and Concepts
by Rainer Grimm
From the article:
In the last post "Function Templates", I wrote about the overloading of function templates and automatically deducing the return type of a function template. Today, I dive deeper and specify explicitly the template arguments of a function template and bring concepts into the play...
By Adrien Hamelin | May 24, 2021 12:02 PM | Tags: c++20
Learning the standard library.
Predefined C++20 Concepts: Callables
by Bartlomiej Filipek
From the article:
Before you start implementing your custom concepts, it’s good to review some goodies in the Standard Library. There’s a high chance that there’s already a predefined concept for you.
Today let’s have a look at concepts related to callable objects...