From df0e442956864a44b14732a57f1ed712b2850bb4 Mon Sep 17 00:00:00 2001
From: Ben Bellick <benbellick@protonmail.com>
Date: Sat, 24 Aug 2024 10:26:01 -0500
Subject: [PATCH] predicate combinators: and_p and or_p

---
 src/core/CCFun.ml  |  4 ++++
 src/core/CCFun.mli | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/src/core/CCFun.ml b/src/core/CCFun.ml
index 65c9a5d5..8a3e5375 100644
--- a/src/core/CCFun.ml
+++ b/src/core/CCFun.ml
@@ -8,6 +8,10 @@ include Sys
 include Stdlib
 include Fun
 
+
+let[@inline] and_p f g x = (f x) && (g x)
+let[@inline] or_p f g x = (f x) || (g x)
+                                    
 let[@inline] compose f g x = g (f x)
 let[@inline] compose_binop f g x y = g (f x) (f y)
 let[@inline] curry f x y = f (x, y)
diff --git a/src/core/CCFun.mli b/src/core/CCFun.mli
index fa69904f..913f28e0 100644
--- a/src/core/CCFun.mli
+++ b/src/core/CCFun.mli
@@ -5,6 +5,16 @@
 include module type of Fun
 (** @inline *)
 
+val and_p : ('a -> bool) -> ('a -> bool) -> 'a -> bool
+(** [and_p f g x] is [(f x) && (g x)].
+    Produces a predicate which is a conjunction of the two predicates.
+*)
+  
+val or_p : ('a -> bool) -> ('a -> bool) -> 'a -> bool
+(** [or_p f g x] is [(f x) || (g x)].
+    Produces a predicate which is a disjunction of the two predicates.
+*)
+  
 val compose : ('a -> 'b) -> ('b -> 'c) -> 'a -> 'c
 (** [compose f g x] is [g (f x)]. Composition. *)