Hello, I am used to having an object containing configuration variables for my project. For instance, in Java, I use static singletons to ensure those configuration variables are instantiated only once for the whole life-cycle of the program and that they are available anywhere in the code. In Py…

There is also the option of creating the configuration object in your main function and passing it around through your functions. And another, making a function that returns the configuration object. I don’t really see the point of disabling multiple instantiation. What problem is prevented by tha…

It’s one of the design patterns in the Gang of Four. It’s useful if you have some resource that must not be instantiated twice by the user, for instance, consider the following function: module Settings struct SettingsStruct a::Int64 b::Int64 function SettingsStruct(a) …

Your solution looks reasonable to me, except that redefining the constructor is very hackish (and do you need the struct the be mutable?). You can instead check if the variable s is defined: module Settings struct SettingsStruct a::Int64 b::Int64 function SettingsStruct…

[image] sapo: It’s one of the design patterns in the Gang of Four. It’s useful if you have some resource that must not be instantiated twice by the user, for instance, consider the following function: Note that this kind of definition doesn’t really work that well in julia, as functions are …

[image] sapo: Anywhere in the code, I am sure that s was not replaced by anyone, neither in interactive sessions. Note that you cannot really ensure this with Julia. No matter how you plan to safeguard this, someone can always just eval into a module, etc. I would just do module Settings ex…

Yep, probably, having the const keyword, that is the way to go…

Implementing singletons for configuration variables

General Usage

sapo July 12, 2021, 8:39am 8

Actually, probably the best way is by using functions: Revise and const values changed during a session? - #3 by sapo

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Implementing singletons for configuration variables

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