Fluent C++
How to Implement operator= When a Data Member Is a Lambda
In C++, some types of class members make it tricky to implement a copy assignment operator, operator=. For example references, const members, and… lambdas. Indeed, in the majority of cases, lambdas don’t have an operator=. (In case you’re wondering in what case lambdas have an operator=, it is in C++20 and when they don’t capture anything.) […]
The post How to Implement operator= When a Data Member Is a Lambda appeared first on Fluent C++.
How to Implement operator= When a Data Member Is a Lambda
In C++, some types of class members make it tricky to implement a copy assignment operator, operator=. For example references, const members, and… lambdas. Indeed, in the majority of cases, lambdas don’t have an operator=. (In case you’re wondering in what case lambdas have an operator=, it is in C++20 and when they don’t capture anything.) […]
The post How to Implement operator= When a Data Member Is a Lambda appeared first on Fluent C++.
Fluent C++
How to Implement operator= When a Data Member Is a Lambda
Expressive code in C++
C++
Created WebApp for learning C++ with online flashcards. Came up with this hobby project when I was having trouble remembering some C++17/20 features.
submitted by /u/xXBazzXx
[link] [comments]
Created WebApp for learning C++ with online flashcards. Came up with this hobby project when I was having trouble remembering some C++17/20 features.
submitted by /u/xXBazzXx
[link] [comments]
reddit
Created WebApp for learning C++ with online flashcards. Came up...
Posted in r/cpp by u/xXBazzXx • 2 points and 1 comment
C++
Qt Desktop Days Keynote - Qt 6 for the desktop - What can we expect?
Qt Desktop Days Keynote - Qt 6 for the desktop - What can we expect?
submitted by /u/kfunk87
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Qt Desktop Days Keynote - Qt 6 for the desktop - What can we expect?
Qt Desktop Days Keynote - Qt 6 for the desktop - What can we expect?
submitted by /u/kfunk87
[link] [comments]
reddit
Qt Desktop Days Keynote - Qt 6 for the desktop - What can we expect?
Posted in r/cpp by u/kfunk87 • 7 points and 0 comments
foonathan::blog()
Technique: Immediately-Invoked Function Expression for Metaprogramming
Common C++ guidelines are to initialize variables on use and to make variables
But sometimes a variable is unchanged once initialized and the initialization is complex, like involving a loop.
Then an IIFE – immediately-invoked function expression – can be used: the variable is initialized by a lambda that computes the value, which is then immediately invoked to produce the value.
Then the variable is initialized on use and can also be made
I’ve been recently working on a meta-programming library where I found IIFEs useful in a slightly different context – computing type information.
TL;DR:
Technique: Immediately-Invoked Function Expression for Metaprogramming
Common C++ guidelines are to initialize variables on use and to make variables
const whenever possible.But sometimes a variable is unchanged once initialized and the initialization is complex, like involving a loop.
Then an IIFE – immediately-invoked function expression – can be used: the variable is initialized by a lambda that computes the value, which is then immediately invoked to produce the value.
Then the variable is initialized on use and can also be made
const.I’ve been recently working on a meta-programming library where I found IIFEs useful in a slightly different context – computing type information.
TL;DR:
decltype([] { ... } ())!www.foonathan.net
Technique: Immediately-Invoked Function Expression for Metaprogramming
Common C++ guidelines are to initialize variables on use and to make variables const whenever possible.
But sometimes a variable is unchanged once initialized and the initialization is complex, like involving a loop.
Then an IIFE – immediately-invoked function…
But sometimes a variable is unchanged once initialized and the initialization is complex, like involving a loop.
Then an IIFE – immediately-invoked function…