ppx_optional

Pattern matching on flat options
README

A ppx rewriter that rewrites simple match statements with an if then
else expression.

Syntax

ppx_optional rewrites the extension match%optional in expressions.
It requires that a module Optional_syntax is in scope, and that it
has is_none and unsafe_value values.

For instance:

match%optional e with
| None -> none_expression
| Some x -> some_expression

becomes:

if Optional_syntax.is_none e then begin
   none_expression
end else begin
   let x = Optional_syntax.unsafe_value e in
   some_expression
end

Usage

This is normally used to safely access an optional value while
avoiding allocation for immediate values
(e.g. Immediate.{Char,Bool,Int}.Option, Fixed.Option,
Price.Fixed.Option, etc...).

Install
Published
21 Mar 2022
Sources
ppx_optional-v0.15.0.tar.gz
sha256=72bb1319fc697c769df15ad659bdd0da2782df286212dd6b004c06e6a057c729
Dependencies
ppxlib
>= "0.23.0"
dune
>= "2.0.0"
base
>= "v0.15" & < "v0.16"
ocaml
>= "4.08.0"
Reverse Dependencies
ppx_jane
>= "v0.15.0"