https://github.com/leviroth/ppx_constr_test

Test if a variant matches a given constructor
https://github.com/leviroth/ppx_constr_test

Last synced: 10 months ago
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Test if a variant matches a given constructor

• Host: GitHub
• URL: https://github.com/leviroth/ppx_constr_test
• Owner: leviroth
• Created: 2018-01-01T03:49:04.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2018-01-02T22:30:08.000Z (over 8 years ago)
• Last Synced: 2025-03-03T07:41:40.591Z (over 1 year ago)
• Language: OCaml
• Size: 3.91 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
This simple ppx rewriter allows you to test if a variant instance matches a

given constructor. `[%constr_test ] x` returns true iff

`` is the constructor of `x`. For example,

```ocaml

[%constr_test None] None        = true

[%constr_test None] (Some 1)    = false

[%constr_test Some __] (Some 1) = true

[%constr_test Some __] None     = false

```

For constructors that take arguments, an argument pattern such as `__` must be

included; otherwise, the rewriter cannot infer the arity of the constructor.