implementation of Py310 int.bit_count

TheAnyKey · youknowone · commit a21c6fb8ee81 · 2020-06-17T18:42:21.000+09:00
diff --git a/vm/src/obj/objint.rs b/vm/src/obj/objint.rs
@@ -653,6 +653,18 @@ impl PyInt {
     fn denominator(&self) -> usize {
         1
     }
+
+    #[pymethod]
+    /// Returns the number of ones 1 an int. When the number is < 0,
+    /// then it returns the number of ones of the absolute value.
+    fn bit_count(&self) -> u32 {
+        self.value
+            .to_u32_digits()
+            .1
+            .iter()
+            .map(|n| n.count_ones())
+            .sum()
+    }
 }
 
 #[derive(FromArgs)]

Original file line number	Diff line number	Diff line change
`@@ -653,6 +653,18 @@ impl PyInt {`
`653`	`653`	`fn denominator(&self) -> usize {`
`654`	`654`	`1`
`655`	`655`	`}`
	`656`	`+`
	`657`	`+ #[pymethod]`
	`658`	`+ /// Returns the number of ones 1 an int. When the number is < 0,`
	`659`	`+ /// then it returns the number of ones of the absolute value.`
	`660`	`+ fn bit_count(&self) -> u32 {`
	`661`	`+ self.value`
	`662`	`+ .to_u32_digits()`
	`663`	`+ .1`
	`664`	`+ .iter()`
	`665`	`+ .map(\|n\| n.count_ones())`
	`666`	`+ .sum()`
	`667`	`+ }`
`656`	`668`	`}`
`657`	`669`
`658`	`670`	`#[derive(FromArgs)]`