Add `slice.swap_between`

core/slice/ptr.odin

@@ -1,5 +1,6 @@
 package slice
 
+import "core:builtin"
 import "core:mem"
 
 ptr_add :: proc(p: $P/^$T, x: int) -> ^T {
@@ -43,6 +44,29 @@ ptr_swap_non_overlapping :: proc(x, y: rawptr, len: int) {
 	}
 }
 
+ptr_swap_overlapping :: proc(x, y: rawptr, len: int) {
+	if len <= 0 {
+		return
+	}
+	if x == y {
+		return
+	}
+	
+	N :: 512
+	buffer: [N]byte = ---
+	
+	a, b := ([^]byte)(x), ([^]byte)(y)
+	
+	for n := len; n > 0; n -= N {
+		m := builtin.min(n, N)
+		mem.copy(&buffer, a, m)
+		mem.copy(a, b, m)
+		mem.copy(b, &buffer, m)
+		
+		a, b = a[N:], b[N:]
+	}
+}
+
 
 ptr_rotate :: proc(left: int, mid: ^$T, right: int) {
 	when size_of(T) != 0 {

core/slice/slice.odin

@@ -11,7 +11,7 @@ _ :: bits
 _ :: mem
 
 
-swap :: proc(array: $T/[]$E, a, b: int, loc := #caller_location) {
+swap :: proc(array: $T/[]$E, a, b: int) {
 	when size_of(E) > 8 {
 		ptr_swap_non_overlapping(&array[a], &array[b], size_of(E))
 	} else {
@@ -19,6 +19,13 @@ swap :: proc(array: $T/[]$E, a, b: int, loc := #caller_location) {
 	}
 }
 
+swap_between :: proc(a, b: $T/[]$E) {
+	n := min(len(a), len(b))
+	if n >= 0 {
+		ptr_swap_overlapping(&a[0], &b[0], size_of(E)*n)
+	}	
+}
+
 
 reverse :: proc(array: $T/[]$E) {
 	n := len(array)/2