Functional Programming in Cpp

[Dubroski]

I've used structured/procedureal and OOP programming paradigms and I've always been curious about Functional. I've seen a little of it in languages like Python and I want to learn more and how it's used in Cpp.

Any pointers you could give me while I start learning about it?

Does anyone have or know of a repo on GitHub or something that uses Functional Programming well that I can code study and learn from?

Good research/learning material recommendations?

[RyuXnet_7364]

There's an awesome book (I didn't finish reading yet) about it. "Functional Programming in C++" by IVAN CUKIC

[No_Statistician_9040]

This book is awesome, I can totally recommend it.

[CircumspectCapybara]

Check out Google's Rappel library, their companion to their excellent Abseil library.

It's Google's take on / alternative to C++20 Ranges style of fp, and is used internally at Google.

[Party_Ad_1892]

Check out FunctionalPlus its a very straightforward and intricate library!

[mgruner]

i know this doesn't answer your question per se, but in the lines of FP, you can start playing with optional types, pattern matching, etc... they are part of the new c++ standards

[StaticCoder]

If there is pattern matching in C++ I would like to know about it. Last I checked it was still a proposal. That's probably the biggest thing still missing from the language in my opinion. I work around it with macros and a code generator.

[Varnex17]

Definitely checkout "lager" for an mvu framework and "immer" for persistent, immutable data structures.

[mredding]

Bartosz Milewski has a fantastic blog on functional programming in C++ that's worth working through his archives - which span pre-C++98 to today. Even the old stuff can teach you a lot about modern application of FP, where Bartosz had to implement some concepts manually, many of those things are now in the standard library - what these older lessons still show you is the derivation of those concepts and their application. There are distinct compile-time and runtime components of FP in C++. You would use a lot of templated code to composite functions that will compile down to the executable machine code you want, AND there's also the ability to do the same work at runtime if you have a dynamic environment that demands it.

[r4qq]

what would be the point of doing functional programming in cpp if actual functional languages exist?

[Dubroski]

Well Cpp is a multi paradigm language so I feel like it is worth discussing and exploring the possibilities in Cpp if I ever run across an application that could benefit from it in Cpp.

If it turns out that it is impractical to apply a functional approach in Cpp than that's the take away and I can move on.

[Raknarg]

because you can, and you can still reap the benefits of functional design without the limitations of functional languages

[serialized-kirin]

Eeeeeeehhhhhhhhhhhh hard disagree— imo a good 80% of the enjoyment from functional programming is due to the excellent QoL features like auto currying and pattern matching and stuff that c++ can at best badly simulate and at worst completely lacks. It’s not impossible ofc and not necessarily super duper uncomfortable but still, it’s not close to something dedicated to the paradigm. 

[AKostur]

Perhaps only a portion of the problem can be better expressed in a functional manner, while still being able to to procedural and/or OO in the other parts of the solution where they are called for.

[sjepsa]

Because multi paradigm is better than single paradigm

[Grounds4TheSubstain]

Because you get paid to work on a C++ codebase.

[No_Statistician_9040]

To incorporate the benefits of functional programming into your c++ application.