From cc2b081a9e68a7590e3732fd9769f098f1154acb Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Thu, 27 Aug 2020 03:38:30 +0300
Subject: [PATCH] Add boost/system/error_category.hpp

---
 include/boost/system/error_category.hpp | 13 ++++
 test/Jamfile.v2                         |  1 +
 test/error_category_test2.cpp           | 79 +++++++++++++++++++++++++
 3 files changed, 93 insertions(+)
 create mode 100644 include/boost/system/error_category.hpp
 create mode 100644 test/error_category_test2.cpp

diff --git a/include/boost/system/error_category.hpp b/include/boost/system/error_category.hpp
new file mode 100644
index 0000000..5b6199b
--- /dev/null
+++ b/include/boost/system/error_category.hpp
@@ -0,0 +1,13 @@
+#ifndef BOOST_SYSTEM_ERROR_CATEGORY_HPP_INCLUDED
+#define BOOST_SYSTEM_ERROR_CATEGORY_HPP_INCLUDED
+
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0
+// http://www.boost.org/LICENSE_1_0.txt
+//
+// See library home page at http://www.boost.org/libs/system
+
+#include <boost/system/detail/error_category.hpp>
+#include <boost/system/detail/error_category_impl.hpp>
+
+#endif // #ifndef BOOST_SYSTEM_ERROR_CATEGORY_HPP_INCLUDED
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index bd13f3d..8d7d5f5 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -77,3 +77,4 @@ run std_single_instance_test.cpp std_single_instance_lib1 std_single_instance_li
 run is_error_code_enum_test.cpp ;
 run is_error_condition_enum_test.cpp ;
 run errc_test.cpp ;
+run error_category_test2.cpp ;
diff --git a/test/error_category_test2.cpp b/test/error_category_test2.cpp
new file mode 100644
index 0000000..72c200f
--- /dev/null
+++ b/test/error_category_test2.cpp
@@ -0,0 +1,79 @@
+
+// Copyright 2018, 2020 Peter Dimov.
+//
+// Distributed under the Boost Software License, Version 1.0.
+//
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+
+// See library home page at http://www.boost.org/libs/system
+
+// Avoid spurious VC++ warnings
+#define _CRT_SECURE_NO_WARNINGS
+
+#include <boost/system/error_category.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <cstdio>
+
+//
+
+namespace sys = boost::system;
+
+class user_category: public sys::error_category
+{
+public:
+
+    virtual const char * name() const BOOST_NOEXCEPT
+    {
+        return "user";
+    }
+
+    virtual std::string message( int ev ) const
+    {
+        char buffer[ 256 ];
+        std::sprintf( buffer, "user message %d", ev );
+
+        return buffer;
+    }
+
+    using sys::error_category::message;
+};
+
+static user_category s_cat_1;
+static user_category s_cat_2;
+
+int main()
+{
+    // default_error_condition
+
+    BOOST_TEST( s_cat_1.default_error_condition( 1 ).value() == 1 );
+    BOOST_TEST( s_cat_1.default_error_condition( 1 ).category() == s_cat_1 );
+
+    BOOST_TEST( s_cat_2.default_error_condition( 2 ).value() == 2 );
+    BOOST_TEST( s_cat_2.default_error_condition( 2 ).category() == s_cat_2 );
+
+    // equivalent
+
+    BOOST_TEST( s_cat_1.equivalent( 1, s_cat_1.default_error_condition( 1 ) ) );
+    BOOST_TEST( !s_cat_1.equivalent( 1, s_cat_1.default_error_condition( 2 ) ) );
+    BOOST_TEST( !s_cat_1.equivalent( 1, s_cat_2.default_error_condition( 2 ) ) );
+
+    // message
+
+    {
+        char buffer[ 256 ];
+        BOOST_TEST_CSTR_EQ( s_cat_1.message( 1, buffer, sizeof( buffer ) ), s_cat_1.message( 1 ).c_str() );
+    }
+
+    {
+        char buffer[ 4 ];
+        BOOST_TEST_CSTR_EQ( s_cat_1.message( 1, buffer, sizeof( buffer ) ), "use" );
+    }
+
+    // ==
+
+    BOOST_TEST_NOT( s_cat_1 == s_cat_2 );
+    BOOST_TEST( s_cat_1 != s_cat_2 );
+
+    return boost::report_errors();
+}