Add log10 for Decimal.

CHANGELOG.md

@@ -14,6 +14,8 @@ Enhancements
 * Added a number of constants to `Dynamic`.
 * Added a number of constants and `fromXXX` constant methods to `Dynamic`.
 * `parse_float()`, `PI()` and `E()` now defer to `Decimal` under `no_float` if `decimal` is turned on.
+* Added `log10()` for `Decimal`.
+* `ln` for `Decimal` is now checked and won't panic.
 
 
 Version 1.0.2

Cargo.toml

@@ -92,7 +92,7 @@ default-features = false
 optional = true
 
 [dependencies.rust_decimal]
-version = "1.14.2"
+version = "1.15"
 default-features = false
 features = ["maths"]
 optional = true

src/packages/math_basic.rs

@@ -339,8 +339,23 @@ mod decimal_functions {
             Ok(x.exp())
         }
     }
-    pub fn ln(x: Decimal) -> Decimal {
-        x.ln()
+    #[rhai_fn(return_raw)]
+    pub fn ln(x: Decimal) -> Result<Decimal, Box<EvalAltResult>> {
+        if cfg!(not(feature = "unchecked")) {
+            x.checked_ln()
+                .ok_or_else(|| make_err(format!("Error taking the natural log of {}", x)))
+        } else {
+            Ok(x.ln())
+        }
+    }
+    #[rhai_fn(name = "log", return_raw)]
+    pub fn log10(x: Decimal) -> Result<Decimal, Box<EvalAltResult>> {
+        if cfg!(not(feature = "unchecked")) {
+            x.checked_log10()
+                .ok_or_else(|| make_err(format!("Error taking the log of {}", x)))
+        } else {
+            Ok(x.log10())
+        }
     }
     #[rhai_fn(name = "floor", get = "floor")]
     pub fn floor(x: Decimal) -> Decimal {