boost_1_45_0/libs/xpressive/test/test_cycles.cpp

///////////////////////////////////////////////////////////////////////////////
// test_cycles.hpp
//
//  Copyright 2008 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)

// defining this causes regex_impl objects to be counted, allowing us to detect
// leaks portably.
#define BOOST_XPRESSIVE_DEBUG_CYCLE_TEST

#include <iostream>
#include <boost/test/unit_test.hpp>
#include <boost/xpressive/xpressive.hpp>

#if defined(_MSC_VER) && defined(_DEBUG)
# define _CRTDBG_MAP_ALLOC
# include <crtdbg.h>
#endif

using namespace boost::unit_test;
using namespace boost::xpressive;

///////////////////////////////////////////////////////////////////////////////
// test_main
// regexes referred to by other regexes are kept alive via reference counting.
// but cycles are handled naturally. the following works as expected and doesn't leak.
void test_main()
{
    {
        sregex v;
        {
            sregex a,b,c;
            a = 'a' >> !by_ref(b);
            //std::cout << a << std::endl;
            //std::cout << b << std::endl;
            //std::cout << c << std::endl;

            // just for giggles
            c = a;
            c = epsilon >> 'a';

            b = epsilon >> by_ref(c);
            //std::cout << a << std::endl;
            //std::cout << b << std::endl;
            //std::cout << c << std::endl;

            c = epsilon >> by_ref(a);
            //std::cout << a << std::endl;
            //std::cout << b << std::endl;
            //std::cout << c << std::endl;

            v = a;
        }
        std::string const s("aaa");
        smatch m;
        if(!regex_match(s, m, v))
        {
            BOOST_ERROR("cycle test 1 failed");
        }
    }

    if(0 != detail::regex_impl<std::string::const_iterator>::instances)
    {
        BOOST_ERROR("leaks detected (cycle test 1)");
        detail::regex_impl<std::string::const_iterator>::instances = 0;
    }

    {
        sregex v;
        {
            sregex a,b,c;
            b = epsilon >> by_ref(c);
            a = 'a' >> !by_ref(b);
            c = epsilon >> by_ref(a);

            //std::cout << a << std::endl;
            //std::cout << b << std::endl;
            //std::cout << c << std::endl;

            v = a;
        }
        std::string const s("aaa");
        smatch m;
        if(!regex_match(s, m, v))
        {
            BOOST_ERROR("cycle test 2 failed");
        }
    }

    if(0 != detail::regex_impl<std::string::const_iterator>::instances)
    {
        BOOST_ERROR("leaks detected (cycle test 2)");
        detail::regex_impl<std::string::const_iterator>::instances = 0;
    }

    {
        sregex v;
        {
            sregex a,b,c;

            b = epsilon >> by_ref(c);
            c = epsilon >> by_ref(a);
            a = 'a' >> !by_ref(b);

            //std::cout << a << std::endl;
            //std::cout << b << std::endl;
            //std::cout << c << std::endl;

            v = a;
        }
        std::string const s("aaa");
        smatch m;
        if(!regex_match(s, m, v))
        {
            BOOST_ERROR("cycle test 3 failed");
        }
    }

    if(0 != detail::regex_impl<std::string::const_iterator>::instances)
    {
        BOOST_ERROR("leaks detected (cycle test 3)");
        detail::regex_impl<std::string::const_iterator>::instances = 0;
    }

    {
        sregex v;
        {
            sregex a,b,c;
            c = epsilon >> by_ref(a);
            b = epsilon >> by_ref(c);
            a = 'a' >> !by_ref(b);

            //std::cout << a << std::endl;
            //std::cout << b << std::endl;
            //std::cout << c << std::endl;

            v = a;
        }
        std::string const s("aaa");
        smatch m;
        if(!regex_match(s, m, v))
        {
            BOOST_ERROR("cycle test 4 failed");
        }
    }

    if(0 != detail::regex_impl<std::string::const_iterator>::instances)
    {
        BOOST_ERROR("leaks detected (cycle test 4)");
        detail::regex_impl<std::string::const_iterator>::instances = 0;
    }

    {
        sregex v;
        {
            sregex a,b,c;
            a = 'a' >> !by_ref(b);
            b = epsilon >> by_ref(c);
            c = epsilon >> by_ref(a);

            sregex d,e;
            d = epsilon >> by_ref(e);
            e = epsilon >> "aa";

            c = d;

            //std::cout << a << std::endl;
            //std::cout << b << std::endl;
            //std::cout << c << std::endl;
            //std::cout << e << std::endl;

            e = 'a' >> by_ref(c);

            //std::cout << "-new loop!\n";
            //std::cout << a << std::endl;
            //std::cout << b << std::endl;
            //std::cout << c << std::endl;
            //std::cout << e << std::endl;

            v = a;

            //std::cout << v << std::endl;

        }
        std::string const s("aaa");
        smatch m;
        if(regex_match(s, m, v)) // OK, this shouldn't match
        {
            BOOST_ERROR("cycle test 5 failed");
        }
    }

    if(0 != detail::regex_impl<std::string::const_iterator>::instances)
    {
        BOOST_ERROR("leaks detected (cycle test 5)");
        detail::regex_impl<std::string::const_iterator>::instances = 0;
    }
}

///////////////////////////////////////////////////////////////////////////////
// init_unit_test_suite
//
test_suite* init_unit_test_suite( int argc, char* argv[] )
{
    test_suite *test = BOOST_TEST_SUITE("test_cycles");
    test->add(BOOST_TEST_CASE(&test_main));
    return test;
}

///////////////////////////////////////////////////////////////////////////////
// Debug stuff
//
namespace
{
    const struct debug_init
    {
        debug_init()
        {
            #ifdef _MSC_VER
            // Send warnings, errors and asserts to STDERR
            _CrtSetReportMode(_CRT_WARN,   _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
            _CrtSetReportFile(_CRT_WARN,   _CRTDBG_FILE_STDERR);
            _CrtSetReportMode(_CRT_ERROR,  _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
            _CrtSetReportFile(_CRT_ERROR,  _CRTDBG_FILE_STDERR);
            _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
            _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);

            // Check for leaks at program termination
            _CrtSetDbgFlag(_CRTDBG_LEAK_CHECK_DF | _CrtSetDbgFlag(_CRTDBG_REPORT_FLAG));

            //_CrtSetBreakAlloc(221);
            #endif
        }
    } dbg;
}