ppx_deriving
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| ppx_deriving | deriving-show-simple | |
|---|---|---|
| 7 | - | |
| 440 | 0 | |
| 2.3% | - | |
| 7.0 | 0.0 | |
| 2 days ago | over 3 years ago | |
| OCaml | Haskell | |
| MIT License | BSD 3-clause "New" or "Revised" License |
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ppx_deriving
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My Thoughts on OCaml
> You gave a beautiful answer about programming language
You do the same thing as in Rust, Scala or Haskell and derive the printer [1]. Then at the callsite, if you know the type then you do `T.show` to print it or `T.eq`. If you don't know the type, then you pass it in at the top level as a module and then do `T.show` or `T.eq`.
> Or to convert one type into another type?
If you want to convert a type, then you have a type that you want to convert from such as foo and bar, then you do `Foo.to_bar value`.
We can keep going, but you can get the point.
You _can't_ judge a language by doing what you want to do with one language in another. If I judge Rust by writing recursive data structures and complaining about performance and verbosity that's not particularly fair correct? I can't say that Dart is terrible for desktop because I can't use chrome developer tools on its canvas output and ignore it's hot-reloading server. I can't say Common Lisp code is unreadable because I don't have type annotations and ignore the REPL for introspection.
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Is rust serde unique?
Ocaml has the amazing ppx_deriving which can be used for serialization / deserialization in various formats.
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Question on type declaration syntax
I wrote a CLI tool and I'd like to produce statically linked binaries of my tool. However, I cannot do this because I'm using the ppx_deriving deriving preprocessor, and I cannot produce a statically linked executable while using this package.
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OCaml at First Glance
Not great, not terrible; the language supports annotations which mean nothing to the compiler but which pre-processors can take advantage of, and there is a framework called ppx which you can use to write your own preprocessor. There exist many pre-processors to do things like add inline tests, generate getter/setter/pretty-printing functions, and so on. Here is an example:
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Bad documentation of Jane Street libraries
is from https://github.com/ocaml-ppx/ppx_deriving
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Recommended method for pretty-printing collections in Core?
Have you tried to derive a print function using https://github.com/ocaml-ppx/ppx_deriving
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How do I define ordering for my sum types?
However, there is a ppx (a pre-processor) which can do the job : ppx_deriving. You just have to anotate your type in oder to get the compare function automatically generated :
deriving-show-simple
We haven't tracked posts mentioning deriving-show-simple yet.
Tracking mentions began in Dec 2020.
What are some alternatives?
ppx_jane - Standard Jane Street ppx rewriters
generic-data - Generic data types in Haskell, utilities for GHC.Generics
ppx_sexp_conv - Generation of S-expression conversion functions from type definitions
church - Automatically convert Generic instances to and from church representations
json-serde - Example of usage antlr4 and shapeless
unfoldable - Class of data structures that can be unfolded.
GenericPretty - A generic, derivable, haskell pretty printer - Research project, summer of 2011
goderive - Derives and generates mundane golang functions that you do not want to maintain yourself
envy - :angry: Environmentally friendly environment variables
base - Standard library for OCaml
higgledy - Higher-kinded data via generics