boost/libs/proto/test/display_expr.cpp

///////////////////////////////////////////////////////////////////////////////
// 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_SP_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;
}