OCaml provides a facility to parameterize modules (modules which accept other modules as arguments) through functors (this is different from functor algebraic data type). Example: module Increment (M : X_int) : X_int = struct let x = M.x + 1 end;; I am curious if there is a popular idiom si…

What do you mean by module arguments? And how a module would depend on other modules, through a use macro? You can probably define a protocol to which your module implementations would adhere, but that would only provide some kind of polymorphism so that conforming modules could be “swapped in later…

What do you mean by module arguments? And how a module would depend on other modules, through a use macro? Module X depends on Module Y and uses functions exposed in module Y. However when I define module X I don’t specify what that module Y is, rather it is an argument. Later I can pass a comp…

[image] lorefnon: Module X depends on Module Y and uses functions exposed in module Y. However when I define module X I don’t specify what that module Y is, rather it is an argument. Later I can pass a compatible implementation of Y, say Y1 to X as a parameter and get a module X1 which uses Y1. …

The more idiomatic way is to pass in the “compatible” module as an argument to Xs functions.

Oh ok. I didn’t realize elixir modules were first class values. Thanks.

Modulenames are just atoms. This is what makes this possible.

There is an idiom used when a library defines a module that must be instantiated by the application that uses it, along with some configuration. Ecto.Repo is an example: defmodule MyApp.Repo use Ecto.Repo, otp_app: MyApp end The otp_app keyword argument allows Ecto.Repo to lookup the remaining …

[image] lorefnon: I am curious if there is a popular idiom similar to this in elixir, where a module can depend on multiple other modules, which can be swapped in later (potentially with different module arguments) to get composite modules. You can pass module atom names around all you want a…

Tuple Calls - #16 by josevalim For all purposes, it is an undocumented feature and it may be removed from Erlang anytime. Tuple calls are already disabled by default on Erlang/OTP 21 and they explicitly require a @compile option on every module that needs them.

Elixir Programming Language Forum

What is the idiomatic solution for parameterizing modules?

Questions & Help Questions

dimitarvp May 1, 2018, 5:43pm 10

What are tuple calls?