python (12.9k questions)

javascript (9.2k questions)

reactjs (4.7k questions)

java (4.2k questions)

java (4.2k questions)

c# (3.5k questions)

c# (3.5k questions)

html (3.3k questions)

Questions - initialization

Replace mem::uninitialized with MaybeUninit

I'm working on a project around embedded systems that needs to use filesystem. I want to use liitlefs crate in rust but it uses mem::uninitialized that deprecated since 1.39.0 . https://github.com/bra...
test-img

p3zhy

rust

initialization

maybeuninit

Votes: 0

Answers: 1

Latest Answer

You can't do uninit().assume_init() — it's definitely not initialized. assume_init() is only to be called once the data has been initialized with real values. The idea behind calling it is that you're...
test-img

John Kugelman

C++ bit field member variable initialization value (UE4 example)

I'm wondering what value a bit-field class member variable will have if it is not explicitly initialized. Using an example from unreal engine 4.27: //member variable of UPrimitiveComponent //there are...
test-img

badger5000

c++

initialization

unreal-engine4

bit-fields

Votes: 0

Answers: 1

Latest Answer

Dug a little bit deeper, so I'll try to answer this myself. I believe that for a normal C++ class it would be undefined behaviour as I cannot find any info suggesting otherwise for bit-fields specific...
test-img

badger5000

Is there a PEP styleguide for class member initialization?

Assuming I want to initialize every member variable in __init__, is there a recommended approach or style according to PEP? Especially for classes where the constructor also calls methods and has a bu...
test-img

mm rnm

python

class

initialization

readability

pep

Votes: 0

Answers: 0

C++ - Why does aggregate initialization not work with template struct

This code works, without having to specify a constructor: struct Foo { int a; int b; }; //... int a1, b1; Foo foo = {a1, b1}; If I make Foo a template, it doesn't work. template<...
test-img

Newline

c++

templates

initialization

c++20

ctad

Votes: 0

Answers: 1

Latest Answer

Since C++20 aggregates have implicitly-generated deduction guide so class template argument deduction works for aggregates too. int a1, b1; Foo foo = {a1, b1}; // works since C++20; T1 and T2 are dedu...
test-img

songyuanyao

Posts

Questions

Blogs

Jobs