From ebedc99ac1148c8d3465ad2338d3db142e57579f Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Mon, 20 May 2019 23:22:58 +1000
Subject: std: add math.isPowerOfTwo

---
 std/math.zig | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'std/math.zig')

diff --git a/std/math.zig b/std/math.zig
index 765df6280c..7464a9fc97 100644
--- a/std/math.zig
+++ b/std/math.zig
@@ -680,6 +680,11 @@ pub fn alignCast(comptime alignment: u29, ptr: var) AlignCastError!@typeOf(@alig
     return @alignCast(alignment, ptr);
 }
 
+pub fn isPowerOfTwo(v: var) bool {
+    assert(v != 0);
+    return (v & (v - 1)) == 0;
+}
+
 pub fn floorPowerOfTwo(comptime T: type, value: T) T {
     var x = value;
 
-- 
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