From e4b4503b81eec90a63e0dbce73b542bfbf401244 Mon Sep 17 00:00:00 2001
From: ToruNiina <niina.toru.68u@gmail.com>
Date: Sat, 28 Sep 2019 12:07:53 +0900
Subject: [PATCH] style: add comment to test::operator<<

---
 tests/test_get_or.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tests/test_get_or.cpp b/tests/test_get_or.cpp
index 0c12a07..7edf7d0 100644
--- a/tests/test_get_or.cpp
+++ b/tests/test_get_or.cpp
@@ -25,6 +25,11 @@ using test_value_types = std::tuple<
 
 namespace test
 {
+// to compare result values in BOOST_TEST().
+//
+// BOOST_TEST outputs the expected and actual values. Thus it includes the
+// output stream operator inside. To compile it, we need operator<<s for
+// containers to compare.
 template<typename charT, typename traits, typename T, typename Alloc>
 std::basic_ostream<charT, traits>&
 operator<<(std::basic_ostream<charT, traits>& os, const std::vector<T, Alloc>& v)