Move some code out of main.cpp

1 files changed, 31 insertions, 0 deletions

diff --git a/aberth/util.h b/aberth/util.h
new file mode 100644
index 0000000..c21a7bb
--- /dev/null
+++ b/aberth/util.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include <iostream>
+#include "defs.h"
+
+using namespace std;
+
+
+template <typename T>
+constexpr static T clearLowestBit(T value) {
+	return value & (value - 1);
+}
+
+template <typename T>
+constexpr static bool ispow2(T value) {
+	return clearLowestBit(value) == 0;
+}
+
+template <typename T>
+constexpr static T ceil2(T value) {
+	T value2 = clearLowestBit(value);
+	if (value2 == 0) return value;
+
+	while (true) {
+		value = value2;
+		value2 = clearLowestBit(value);
+		if (value2 == 0) return value << 1;
+	}
+}
+
+ostream& operator<<(ostream &os, const Poly &p);