optional ufmt::uDebug impl

src/calc.rs

@@ -1,10 +1,13 @@
 use core::{convert::Infallible, fmt::Display, marker::PhantomData};
 
 use num_traits::{float::FloatCore, PrimInt, Unsigned};
+#[cfg(feature = "ufmt")]
+use ufmt::derive::uDebug;
 
 use crate::{Decimal, DecimalError};
 
 #[derive(Debug)]
+#[cfg_attr(feature = "ufmt", derive(uDebug))]
 pub enum StackCalcError {
     StackOverflow,
     StackUnderflow,
@@ -28,6 +31,21 @@ pub struct StackCalc<F: FloatCore, const STACK: usize = 2, const DSIZE: usize =
     phantom: PhantomData<F>,
 }
 
+#[cfg(feature = "ufmt")]
+impl<F: FloatCore + ufmt::uDebug, const STACK: usize, const DSIZE: usize, EXP: ufmt::uDebug>
+    ufmt::uDebug for StackCalc<F, STACK, DSIZE, EXP>
+{
+    fn fmt<W>(&self, f: &mut ufmt::Formatter<'_, W>) -> Result<(), W::Error>
+    where
+        W: ufmt::uWrite + ?Sized,
+    {
+        f.debug_struct("StackCalc")?
+            .field("stack", &self.stack.as_slice())?
+            .field("index", &self.index)?
+            .finish()
+    }
+}
+
 impl<F: FloatCore, const STACK: usize, const DSIZE: usize, EXP: PrimInt> Default
     for StackCalc<F, STACK, DSIZE, EXP>
 {