From e1a3501a78e85bb83bbfe0448ce229add4b24e32 Mon Sep 17 00:00:00 2001
From: Alexander Grund <Flamefire@users.noreply.github.com>
Date: Fri, 16 Aug 2024 10:52:32 +0200
Subject: [PATCH 1/2] Rename test_equals_none to test_cmp_none

In order to add more tests the new name is more fitting.
---
 test/Jamfile.v2                                                 | 2 +-
 ...optional_test_equals_none.cpp => optional_test_cmp_none.cpp} | 0
 2 files changed, 1 insertion(+), 1 deletion(-)
 rename test/{optional_test_equals_none.cpp => optional_test_cmp_none.cpp} (100%)

diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 00bf152..de84f2e 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -42,7 +42,7 @@ run optional_test_inplace_factory.cpp ;
 run optional_test_io.cpp ;
 run optional_test_move.cpp ;
 run optional_test_noexcept_move.cpp ;
-run optional_test_equals_none.cpp ;
+run optional_test_cmp_none.cpp ;
 run optional_test_value_access.cpp ;
 run optional_test_emplace.cpp ;
 run optional_test_minimum_requirements.cpp ;
diff --git a/test/optional_test_equals_none.cpp b/test/optional_test_cmp_none.cpp
similarity index 100%
rename from test/optional_test_equals_none.cpp
rename to test/optional_test_cmp_none.cpp

From 5fa59b9a3533a017dd30c9536255252c253f229c Mon Sep 17 00:00:00 2001
From: Alexander Grund <Flamefire@users.noreply.github.com>
Date: Fri, 16 Aug 2024 11:13:45 +0200
Subject: [PATCH 2/2] Add test for all relational operators to `boost::none`

---
 test/optional_test_cmp_none.cpp | 40 +++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/test/optional_test_cmp_none.cpp b/test/optional_test_cmp_none.cpp
index 1e3157b..691517b 100644
--- a/test/optional_test_cmp_none.cpp
+++ b/test/optional_test_cmp_none.cpp
@@ -1,4 +1,5 @@
 // Copyright (C) 2014 Andrzej Krzemienski.
+// Copyright (C) 2024 Alexander Grund
 //
 // Use, modification, and distribution is subject to the Boost Software
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@@ -36,6 +37,45 @@ void test_equal_to_none_of_noncomparable_T()
   BOOST_TEST(boost::none == o);
 }
 
+void test_comparison_to_none()
+{
+    using boost::none;
+    boost::optional<SemiRegular> i = SemiRegular();
+    // the default ordering of optional<size_t> is{ boost::none, 0, 1, 2, ... }
+    // Hence boost::none < i for any engaged i
+    // and all others operators ( ==, !=, <, <=, >, >= ) follow
+
+    BOOST_TEST(!(i == none));
+    BOOST_TEST(i != none);
+    BOOST_TEST(!(i < none));
+    BOOST_TEST(!(i <= none));
+    BOOST_TEST(i > none);
+    BOOST_TEST(i >= none);
+    // Comparison is symmetric
+    BOOST_TEST(!(none == i));
+    BOOST_TEST(none != i);
+    BOOST_TEST(none < i);
+    BOOST_TEST(none <= i);
+    BOOST_TEST(!(none > i));
+    BOOST_TEST(!(none >= i));
+
+    // An un-engaged optional is always equal to none
+    boost::optional<SemiRegular> o;
+    BOOST_TEST(o == none);
+    BOOST_TEST(!(o != none));
+    BOOST_TEST(!(o < none));
+    BOOST_TEST(o <= none);
+    BOOST_TEST(!(o > none));
+    BOOST_TEST(o >= none);
+    // Comparison is symmetric
+    BOOST_TEST(none == o);
+    BOOST_TEST(!(none != o));
+    BOOST_TEST(!(none < o));
+    BOOST_TEST(none <= o);
+    BOOST_TEST(!(none > o));
+    BOOST_TEST(none >= o);
+}
+
 int main()
 {
   test_equal_to_none_of_noncomparable_T();