From af3dd99eff4eeee5231a9e77f876126ef67ae664 Mon Sep 17 00:00:00 2001
From: Bardur Arantsson <bardur@scientician.net>
Date: Mon, 20 Jun 2016 22:49:05 +0200
Subject: Add flag_set::count() method to count set bits

---
 src/flag_set.hpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/flag_set.hpp b/src/flag_set.hpp
index b4bdc92f..aa90a217 100644
--- a/src/flag_set.hpp
+++ b/src/flag_set.hpp
@@ -67,6 +67,19 @@ public:
 		return true;
 	}
 
+	constexpr std::size_t count() const
+	{
+		std::size_t n = 0;
+		for (std::size_t i = 0; i < nbits; i++)
+		{
+			if (bit(i))
+			{
+				n += 1;
+			}
+		}
+		return n;
+	}
+
 	uint32_t &operator[](std::size_t i)
 	{
 		assert(i < tiers);
-- 
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