Questions tagged [constants]
The constants tag has no summary.
23 questions
0
votes
1
answer
1k
views
Should private static constants be in declaration (header) or defintion (source)?
Given a class which has certain private, constants (e.g., configuration), should these (A) be included in the declaration of the class (in the private section) or (B) should it be "hidden" ...
- 799
18
votes
6
answers
5k
views
Is setRGBColor(32,128,192) a valid use of magic number?
According to When is a number a magic number?, I know magic number should not exists, so I know the following code about creating a Label from some UI framework and set the color RGB needs to be ...
- 3,003
1
vote
2
answers
3k
views
How to deal with constants that are shared between multiple packages?
I'm looking at creating my first packages to clean up my codebase.
Below is a very simplified version of my current project structure:
my_project/
|-database.py
|-app_1.py
|-app_2.py
|-constants.py
...
- 311
2
votes
2
answers
548
views
What is the best way to keep some constant complex data structures in a C++ code?
As implied by the title of the Q, I have a few entities and need to keep them as constant objects in a C++ project. Each entity contains very complex data structures (lists of enums, maps of maps, etc....
- 211
1
vote
1
answer
109
views
Term for a map of constants [closed]
Considering there's a map of string constants, most commonly with a key and a value being equal, e.g. in TypeScript:
const itemTypes = {
FOO_BAR: 'FOO_BAR',
BAZ_QUX: 'BAZ_QUX',
} as const;
They ...
- 195
3
votes
3
answers
4k
views
Define "constants" at the global or function scope?
I often define variables that will never change, i.e. constants, at the top of a script/module. But recently I've been wondering if it makes sense to define them at the function scope level if they ...
- 1,047
144
votes
3
answers
34k
views
Where do "magic" hashing constants like 0x9e3779b9 and 0x9e3779b1 come from?
In code dealing with hash tables, I often find the constant 0x9e3779b9 or sometimes 0x9e3779b1. For example
hash = n * 0x9e3779b1 >>> 24
Why is this particular value used?
- 1,023
0
votes
1
answer
178
views
Visibility of constants
Should constants of my class only be public if I know that they will be used from their users or doesn't it hurt to make all of my constants public per se?
Is not exposing all constants cleaner?
- 119
1
vote
1
answer
707
views
Should I use accessors or public static fields for global constants?
I have to work on some code that was CAST-audited. The report says that it is bad in Java to use public static and that accessors should be preferred. That is also what I was taught at school.
The ...
- 163
4
votes
4
answers
1k
views
Is a constant name related to its current value an anti-pattern? [closed]
For example, suppose I have a string constant like this:
const TITLEBAR_MESSAGE="Welcome back, %USERNAME%!";
I think it is more readable when it is named as
const WELCOME_BACK_USERNAME="Welcome ...
- 5,760
0
votes
2
answers
621
views
Referencing Database Primary Keys from Codebase
I don't have a lot of experience with these kind of issues, but I feel I need to consult on this issue. The current codebase I'm working on is using what I consider to be a questionable technique to ...
- 109
3
votes
5
answers
2k
views
I feel like these constants should be in a different class?
I have a static class called RenderingUtilities that houses several useful methods and constants. Some of these constants are related to the Earth as an object such as the Earth's radius. I believe ...
- 1,175
3
votes
1
answer
120
views
Should I replace a constant with static methods, if that constant usually 'cooperate' with a specific operator?
For example, to convert between g and kg, I have a constant 1000:
public static final float G_TO_KG=1000;
.
.
.
this.result = someResult*1000;
I found G_TO_KG always bind to operator '*'. So my ...
- 5,760
2
votes
3
answers
370
views
When defining constants, which is more important? Easier to find? Or narrower scope?
For example, consider I have constants VOL_MIN and VOL_MAX, which is used inside 1 function only:
public void setVolume(int val){
final int VOL_MIN = 1;
final int VOL_MAX = 10;
val=Math....
- 5,760
1
vote
1
answer
243
views
Should I make constant for values of three choices (trivalent/ternary)?
For two choices there is boolean. In my case, I have positive, negative, and neutral which are three choices and cannot be represented by boolean. I've see there's method Math.signum(x) in Java which ...
- 154