fix drop

src/lib.rs

@@ -1,3 +1,6 @@
+#![deny(missing_docs)]
+#![warn(clippy::all)]
+
 //! A crate for small integer optimization. Provides the [`SmallInt`] type. When possible this will
 //! inline an integer and store it on the stack if that integer is small. However, for larger values, 
 //! this will be instead stored on the heap as a pointer to a `u32` slice, a length, and a sign.
@@ -15,8 +18,8 @@ pub enum SmallIntError {
 
 impl std::error::Error for SmallIntError {}
 
-impl std::fmt::Display for SmallIntError {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+impl core::fmt::Display for SmallIntError {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         let Self::ConversionError = self;
         write!(f, "Error converting integer to SmallInt.")
     }
@@ -37,7 +40,18 @@ pub enum SmallInt {
     Heap((*mut u32, isize))
 }
 
+impl Drop for SmallInt {
+    fn drop(&mut self) {
+        if let Self::Heap((r, s)) = self {
+            let size = usize::try_from(s.abs()).unwrap();
+            let mut slice = unsafe { core::slice::from_raw_parts(r, size) };
+            unsafe {
+                core::ptr::drop_in_place(&mut slice);
+            }
+        }
+    }
 
+}
 
 macro_rules! int_impl {
     ($itype:ty) => {
@@ -102,7 +116,7 @@ impl TryFrom<SmallInt> for u128 {
                 let mut ret: u128 = 0;
                 let mut bits = 0;
                 let size = usize::try_from(s.abs()).unwrap();
-                let slice = unsafe { std::slice::from_raw_parts(r, size) };
+                let slice = unsafe { core::slice::from_raw_parts(r, size) };
                 for i in slice {
                     if bits >= 128 {
                         return Err(SmallIntError::ConversionError);
@@ -144,7 +158,7 @@ impl From<SmallInt> for BigInt {
             SmallInt::Heap((r, s)) => {
                 let size = usize::try_from(s.abs()).unwrap();
                 let sign = s.signum();
-                let slice = unsafe { std::slice::from_raw_parts(r, size) };
+                let slice = unsafe { core::slice::from_raw_parts(r, size) };
                 let bs = match sign {
                     0 => Sign::NoSign,
                     -1 => Sign::Minus,
@@ -162,27 +176,41 @@ impl From<SmallInt> for BigInt {
 mod conversion_tests {
 
     use crate::SmallInt;
+    use num_bigint::{BigInt, Sign};
 
+    macro_rules! conversion_tests {
+        ($t:ty, $i:ident) => {
             #[test]
-    fn test_u8() {
-        let i = u8::MAX;
+            fn $i() {
+                let i = <$t>::MAX;
                 let s = SmallInt::from(i);
-        assert_eq!(u8::try_from(s).unwrap(), i);
+                assert_eq!(<$t>::try_from(s).unwrap(), i);
 
-        let i = u8::MIN;
+                let i = <$t>::MIN;
                 let s = SmallInt::from(i);
-        assert_eq!(u8::try_from(s).unwrap(), i);
+                assert_eq!(<$t>::try_from(s).unwrap(), i);
             }
 
-    #[test]
-    fn test_i8() {
-        let i = i8::MIN;
-        let s = SmallInt::from(i);
-        assert_eq!(i8::try_from(s).unwrap(), i);
-
-        let i = i8::MAX;
-        let s = SmallInt::from(i);
-        assert_eq!(i8::try_from(s).unwrap(), i);
         }
+    }
+
+    conversion_tests!(u8, test_u8);
+    conversion_tests!(i8, test_i8);
+    conversion_tests!(u16, test_u16);
+    conversion_tests!(i16, test_i16);
+    conversion_tests!(u32, test_u32);
+    conversion_tests!(i32, test_i32);
+    conversion_tests!(u64, test_u64);
+    conversion_tests!(i64, test_i64);
+    conversion_tests!(u128, test_u128);
+    conversion_tests!(i128, test_i128);
+
+    #[test]
+    fn test_bigint() {
+        let i = BigInt::new(Sign::Plus, vec![5, 4, 8, 3, 2, 9, 3]);
+        let s = SmallInt::from(i);
+        assert_eq!(BigInt::from(s).to_u32_digits(), (Sign::Plus, vec![5, 4, 8, 3, 2, 9, 3]));
+    }
+
 }