From a413220f8dc3d51aee79eabe6c2bfec33b8bf288 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@pdimov.com>
Date: Mon, 22 Jan 2018 19:43:28 +0200
Subject: [PATCH] Add more constexpr tests

---
 test/constexpr_test.cpp | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/test/constexpr_test.cpp b/test/constexpr_test.cpp
index 2c50aa5..386ce66 100644
--- a/test/constexpr_test.cpp
+++ b/test/constexpr_test.cpp
@@ -6,6 +6,8 @@
 #include <boost/core/lightweight_test.hpp>
 #include <boost/config/pragma_message.hpp>
 #include <boost/static_assert.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
 
 #if !defined(BOOST_SYSTEM_HAS_CONSTEXPR)
 
@@ -20,11 +22,34 @@ constexpr error_code e1( 1, system_category() );
 
 BOOST_STATIC_ASSERT( e1.value() == 1 );
 BOOST_STATIC_ASSERT( e1.category() == system_category() );
+BOOST_STATIC_ASSERT( e1 );
+BOOST_STATIC_ASSERT( e1 == e1 );
 
 constexpr error_code e2( 2, generic_category() );
 
 BOOST_STATIC_ASSERT( e2.value() == 2 );
 BOOST_STATIC_ASSERT( e2.category() == generic_category() );
+BOOST_STATIC_ASSERT( e2 );
+BOOST_STATIC_ASSERT( e2 == e2 );
+
+#if !BOOST_WORKAROUND(BOOST_GCC, < 80000)
+
+BOOST_STATIC_ASSERT( e1 != e2 );
+
+#endif
+
+constexpr error_code e3;
+
+BOOST_STATIC_ASSERT( e3.value() == 0 );
+BOOST_STATIC_ASSERT( e3.category() == system_category() );
+BOOST_STATIC_ASSERT( !e3 );
+BOOST_STATIC_ASSERT( e3 == e3 );
+
+#if !BOOST_WORKAROUND(BOOST_GCC, < 80000)
+
+BOOST_STATIC_ASSERT( e1 != e3 );
+
+#endif
 
 int main()
 {
@@ -34,6 +59,9 @@ int main()
     error_code e2_( 2, generic_category() );
     BOOST_TEST_EQ( e2, e2_ );
 
+    error_code e3_;
+    BOOST_TEST_EQ( e3, e3_ );
+
     return boost::report_errors();
 }