1 files changed, 68 insertions, 0 deletions
diff --git a/src/boost/libs/proto/test/display_expr.cpp b/src/boost/libs/proto/test/display_expr.cpp
new file mode 100644
index 000000000..05c47ff5f
--- /dev/null
+++ b/src/boost/libs/proto/test/display_expr.cpp
@@ -0,0 +1,68 @@
+///////////////////////////////////////////////////////////////////////////////
+// display_expr.cpp
+//
+//  Copyright 2010 Eric Niebler. 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)
+
+#include <sstream>
+#include <boost/proto/proto.hpp>
+#include <boost/test/unit_test.hpp>
+
+namespace mpl = boost::mpl;
+namespace proto = boost::proto;
+using proto::_;
+
+struct A {};
+struct B : A {};
+std::ostream& operator<<( std::ostream& out, const A& ) { return out << "this is A!"; }
+
+struct C {};
+
+void test_display_expr()
+{
+    // https://svn.boost.org/trac/boost/ticket/4910
+    proto::terminal<int>::type i = {0};
+
+    {
+        std::stringstream sout;
+        proto::display_expr(i + A(), sout);
+        BOOST_CHECK_EQUAL(sout.str(), std::string(
+          "plus(\n"
+          "    terminal(0)\n"
+          "  , terminal(this is A!)\n"
+          ")\n"));
+    }
+
+    {
+        std::stringstream sout;
+        proto::display_expr(i + B(), sout);
+        BOOST_CHECK_EQUAL(sout.str(), std::string(
+          "plus(\n"
+          "    terminal(0)\n"
+          "  , terminal(this is A!)\n"
+          ")\n"));
+    }
+
+    {
+        std::stringstream sout;
+        char const * Cname = BOOST_CORE_TYPEID(C).name();
+        proto::display_expr(i + C(), sout);
+        BOOST_CHECK_EQUAL(sout.str(), std::string(
+          "plus(\n"
+          "    terminal(0)\n"
+          "  , terminal(") + Cname + std::string(")\n"
+          ")\n"));
+    }
+}
+
+using namespace boost::unit_test;
+///////////////////////////////////////////////////////////////////////////////
+// init_unit_test_suite
+//
+test_suite* init_unit_test_suite( int argc, char* argv[] )
+{
+    test_suite *test = BOOST_TEST_SUITE("test display_expr() function");
+    test->add(BOOST_TEST_CASE(&test_display_expr));
+    return test;
+}