# Library Coq.extraction.ExtrOcamlBasic

Extraction to Ocaml : use of basic Ocaml types
Scheme Equality for nat.
Extract Inductive bool => bool [ true false ].
Extract Inductive option => option [ Some None ].
Extract Inductive unit => unit [ "()" ].
Extract Inductive list => list [ "[]" "( :: )" ].
Extract Inductive prod => "( * )" [ "" ].
NB: The "" above is a hack, but produce nicer code than "(,)"
Mapping sumbool to bool and sumor to option is not always nicer, but it helps when realizing stuff like lt_eq_lt_dec
Extract Inductive sumbool => bool [ true false ].
Extract Inductive sumor => option [ Some None ].
Restore lazyness of andb, orb. NB: without these Extract Constant, andb/orb would be inlined by extraction in order to have lazyness, producing inelegant (if ... then ... else false) and (if ... then true else ...).
Extract Inlined Constant andb => "(&&)".
Extract Inlined Constant orb => "(||)".