python (65.1k questions)

javascript (44.2k questions)

reactjs (22.7k questions)

java (20.8k questions)

c# (17.4k questions)

html (16.3k questions)

r (13.7k questions)

android (12.9k questions)

Questions - constants

How to initialise struct with constant members with certain address?

I am trying to initialise class object (which has constant members) with certain values and certain address. I understand that this is because members are constant but I need them to be constant. I tr...
test-img

bugrishka

c++

class

pointers

constants

Votes: 0

Answers: 1

Latest Answer

You can create an object at a specific address using placement-new: extern void* some_address; int main() { ints* ptr = new(some_address) ints{1, 2}; std::cout << ptr->a; }
test-img

eerorika

How can I pass a reference of an array defined as constant?

I defined hash and array constants, When passing those to a function, I'll have to pass them as references. However I'm wondering what the correct syntax is. Consider this example: #!/usr/bin/perl use...
test-img

U. Windl

perl

constants

Votes: 0

Answers: 1

Latest Answer

The List Constants section in the constant pragma docs tells us that Constants may be lists of more (or less) than one value. ... List constants are lists, not arrays. This means, among other proper...
test-img

zdim

Flutter: create const color from hex string

I am using Firebase remote config to store my color values. This gives me the flexibilty to update colors without the need to update my app. Now I have written myself a helper function which returns t...
test-img

Jan

flutter

dart

constructor

constants

default-value

Votes: 0

Answers: 1

Latest Answer

You sadly won't be able to const anything from the API. The const keyword implies that the Dart Analyzer knows what the value will be even before compiling. This isn't the case here, as the values com...
test-img

Me&#239; M.

Why &quot;Type of argument to each on reference must be unblessed hashref or arrayref at test.pl line 17.&quot;?

I don't understand the error message Type of argument to each on reference must be unblessed hashref or arrayref at test.pl line 17. for this test case (extracted from a larger module): BEGIN { our ...
test-img

U. Windl

perl

constants

each

Votes: 0

Answers: 2

Latest Answer

That _TEST_TIMESTAMPS is given as a "list constant" in the question and will behave only as a flat list, not as a hash. See this post for a very detailed discussion. Also, as such it is rej...
test-img

zdim

Posts

Questions

Blogs

Jobs