Add operator<< for source_location

test/source_location_test3.cpp

@@ -0,0 +1,30 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/assert/source_location.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <sstream>
+
+int main()
+{
+    {
+        boost::source_location loc;
+
+        std::ostringstream os;
+        os << loc;
+
+        BOOST_TEST_EQ( os.str(), std::string( "(unknown source location)" ) );
+    }
+
+    {
+        boost::source_location loc = BOOST_CURRENT_LOCATION;
+
+        std::ostringstream os;
+        os << loc;
+
+        BOOST_TEST_EQ( os.str(), std::string( __FILE__ ) + ":21: in function '" + BOOST_CURRENT_FUNCTION + "'" );
+    }
+
+    return boost::report_errors();
+}