From e11bd2a193f170bebbb2723acc6c52bab2106b0c Mon Sep 17 00:00:00 2001
From: HarmoGlace <23212967+HarmoGlace@users.noreply.github.com>
Date: Thu, 13 Apr 2023 14:38:51 +0200
Subject: Add factorial, permutation and binomial to calculation functions
 (#639)

---
 src/eval/cast.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'src/eval')

diff --git a/src/eval/cast.rs b/src/eval/cast.rs
index 7b306633..e2ae115f 100644
--- a/src/eval/cast.rs
+++ b/src/eval/cast.rs
@@ -114,6 +114,21 @@ cast_to_value! {
     v: usize => Value::Int(v as i64)
 }
 
+cast_from_value! {
+    u64,
+    int: i64 => int.try_into().map_err(|_| {
+        if int < 0 {
+            "number must be at least zero"
+        } else {
+            "number too large"
+        }
+    })?,
+}
+
+cast_to_value! {
+    v: u64 => Value::Int(v as i64)
+}
+
 cast_from_value! {
     NonZeroUsize,
     int: i64 => int
-- 
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