From 31b4f8fa31b04bfe869aac0828edf5fa8a2b9730 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sat, 22 Jul 2017 17:40:06 -0400
Subject: [PATCH] Added an expository TODO.

---
 NumberTheory/Factors.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/NumberTheory/Factors.hpp b/NumberTheory/Factors.hpp
index 98832d247..9fe660bc2 100644
--- a/NumberTheory/Factors.hpp
+++ b/NumberTheory/Factors.hpp
@@ -16,6 +16,7 @@ namespace NumberTheory {
 		@returns The greatest common divisor of @c a and @c b as computed by Euclid's algorithm.
 	*/
 	template<class T> T greatest_common_divisor(T a, T b) {
+		// TODO: replace with the C++17 GCD function, once available.
 		if(a < b) {
 			std::swap(a, b);
 		}