From ff5eb67906503e3b3fa842d74a4d14ec93c697a1 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Sun, 12 Jan 2025 02:51:15 +0200
Subject: [PATCH] Add array_eq_test.cpp

---
 test/Jamfile.v2        |  1 +
 test/array_eq_test.cpp | 83 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 test/array_eq_test.cpp

diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 64ac0ab..8de446d 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -43,6 +43,7 @@ run array_fill_test.cpp ;
 run array_assign_test.cpp ;
 run array_swap_test.cpp ;
 run array_swap_test2.cpp ;
+run array_eq_test.cpp ;
 
 #
 
diff --git a/test/array_eq_test.cpp b/test/array_eq_test.cpp
new file mode 100644
index 0000000..c0ba3fa
--- /dev/null
+++ b/test/array_eq_test.cpp
@@ -0,0 +1,83 @@
+// Copyright 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/array.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <cstddef>
+
+template<class T, std::size_t N> void test()
+{
+    {
+        boost::array<T, N> const a1 = {};
+        boost::array<T, N> const a2 = {};
+
+        BOOST_TEST( a1 == a2 );
+        BOOST_TEST_NOT( a1 != a2 );
+    }
+
+    for( std::size_t i = 0; i < N; ++i )
+    {
+        boost::array<T, N> const a1 = {};
+
+        boost::array<T, N> a2 = a1;
+        a2[ i ] = 1;
+
+        BOOST_TEST( a1 != a2 );
+        BOOST_TEST_NOT( a1 == a2 );
+
+        boost::array<T, N> const a3 = a2;
+
+        BOOST_TEST( a1 != a3 );
+        BOOST_TEST_NOT( a1 == a3 );
+    }
+
+    {
+        boost::array<T, N> a1 = {};
+        boost::array<T, N> a2 = {};
+
+        a1.fill( 1 );
+        a2.fill( 1 );
+
+        BOOST_TEST( a1 == a2 );
+        BOOST_TEST_NOT( a1 != a2 );
+    }
+}
+
+template<class T> void test2()
+{
+    {
+        boost::array<T, 4> const a1 = {{ 1, 2, 3, 4 }};
+        boost::array<T, 4> const a2 = {{ 1, 2, 3, 4 }};
+
+        BOOST_TEST( a1 == a2 );
+        BOOST_TEST_NOT( a1 != a2 );
+    }
+
+    for( std::size_t i = 0; i < 4; ++i )
+    {
+        boost::array<T, 4> const a1 = {{ 1, 2, 3, 4 }};
+
+        boost::array<T, 4> a2 = a1;
+        a2[ i ] = 0;
+
+        BOOST_TEST( a1 != a2 );
+        BOOST_TEST_NOT( a1 == a2 );
+
+        boost::array<T, 4> const a3 = a2;
+
+        BOOST_TEST( a1 != a3 );
+        BOOST_TEST_NOT( a1 == a3 );
+    }
+}
+
+int main()
+{
+    test<int, 0>();
+    test<int, 1>();
+    test<int, 7>();
+
+    test2<int>();
+
+    return boost::report_errors();
+}