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
22 Mar 2018
Sources
ppx_optional-v0.11.0.tar.gz
md5=27bcae8445af584299876bdab0288152
Dependencies
ppxlib
>= "0.1.0" & < "0.9.0"
ocaml-migrate-parsetree
>= "1.0" & < "2.0.0"
jbuilder
>= "1.0+beta18.1"
base
>= "v0.11" & < "v0.12"
ocaml
>= "4.04.1"
Reverse Dependencies
ppx_jane
= "v0.11.0"