lib/core/math: intro clamp

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/core/math.nit b/lib/core/math.nit
index 7b51e2a..c8842fd 100644 (file)
--- a/lib/core/math.nit
+++ b/lib/core/math.nit
@@ -420,6 +420,17 @@ fun inf: Float do return 1.0 / 0.0
 # ~~~
 fun nan: Float do return 0.0 / 0.0
 
+redef class Comparable
+       # Constraint `self` within `[min..max]`
+       #
+       #     assert 1.clamp(5, 10) == 5
+       #     assert 7.clamp(5, 10) == 7
+       #     assert 15.clamp(5, 10) == 10
+       #     assert 1.5.clamp(1.0, 2.0) == 1.5
+       #     assert "a".clamp("b", "c") == "b"
+       fun clamp(min, max: OTHER): OTHER do return self.max(min).min(max)
+end
+
 redef class Collection[ E ]
        # Return a random element form the collection
        # There must be at least one element in the collection