boost/libs/fusion/test/sequence/map.cpp

/*=============================================================================
    Copyright (c) 2001-2011 Joel de Guzman

    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 <boost/detail/lightweight_test.hpp>
#include <boost/fusion/container/map/map.hpp>
#include <boost/fusion/container/generation/make_map.hpp>
#include <boost/fusion/sequence/intrinsic/at_key.hpp>
#include <boost/fusion/sequence/intrinsic/value_at_key.hpp>
#include <boost/fusion/sequence/intrinsic/has_key.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/io/out.hpp>
#include <boost/fusion/iterator/key_of.hpp>
#include <boost/fusion/iterator/deref_data.hpp>
#include <boost/fusion/iterator/value_of_data.hpp>
#include <boost/fusion/iterator/next.hpp>
#include <boost/fusion/support/pair.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/static_assert.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/mpl/at.hpp>
#include <boost/typeof/typeof.hpp>
#include <iostream>
#include <string>


struct copy_all
{
    copy_all() {}
    copy_all(copy_all const&) {}

    template <typename T>
    copy_all(T const& x)
    {
        foo(x); // should fail!
    }
};

struct abstract
{
    virtual void foo() = 0;
};

int
main()
{
    using namespace boost::fusion;
    using namespace boost;
    namespace fusion = boost::fusion;
    using boost::fusion::pair;
    using boost::fusion::make_pair;

    std::cout << tuple_open('[');
    std::cout << tuple_close(']');
    std::cout << tuple_delimiter(", ");

    {
        typedef map<
            pair<int, char>
          , pair<double, std::string>
          , pair<abstract, int> >
        map_type;

        BOOST_MPL_ASSERT((traits::is_associative<map_type>));
        BOOST_MPL_ASSERT((traits::is_random_access<map_type>));

        map_type m(
            make_pair<int>('X')
          , make_pair<double>("Men")
          , make_pair<abstract>(2));

        std::cout << at_key<int>(m) << std::endl;
        std::cout << at_key<double>(m) << std::endl;
        std::cout << at_key<abstract>(m) << std::endl;

        BOOST_TEST(at_key<int>(m) == 'X');
        BOOST_TEST(at_key<double>(m) == "Men");
        BOOST_TEST(at_key<abstract>(m) == 2);

        BOOST_STATIC_ASSERT((
            boost::is_same<boost::fusion::result_of::value_at_key<map_type, int>::type, char>::value));
        BOOST_STATIC_ASSERT((
            boost::is_same<boost::fusion::result_of::value_at_key<map_type, double>::type, std::string>::value));
        BOOST_STATIC_ASSERT((
            boost::is_same<boost::fusion::result_of::value_at_key<map_type, abstract>::type, int>::value));

        std::cout << m << std::endl;

        BOOST_STATIC_ASSERT((boost::fusion::result_of::has_key<map_type, int>::value));
        BOOST_STATIC_ASSERT((boost::fusion::result_of::has_key<map_type, double>::value));
        BOOST_STATIC_ASSERT((boost::fusion::result_of::has_key<map_type, abstract>::value));
        BOOST_STATIC_ASSERT((!boost::fusion::result_of::has_key<map_type, std::string>::value));

        std::cout << deref_data(begin(m)) << std::endl;
        std::cout << deref_data(fusion::next(begin(m))) << std::endl;

        BOOST_TEST(deref_data(begin(m)) == 'X');
        BOOST_TEST(deref_data(fusion::next(begin(m))) == "Men");
        BOOST_TEST(deref_data(fusion::next(next(begin(m)))) == 2);

        BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::key_of<boost::fusion::result_of::begin<map_type>::type>::type, int>::value));
        BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::key_of<boost::fusion::result_of::next<boost::fusion::result_of::begin<map_type>::type>::type>::type, double>::value));
        BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::key_of<boost::fusion::result_of::next<boost::fusion::result_of::next<boost::fusion::result_of::begin<map_type>::type>::type>::type>::type, abstract>::value));
        BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::value_of_data<boost::fusion::result_of::begin<map_type>::type>::type, char>::value));
        BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::value_of_data<boost::fusion::result_of::next<boost::fusion::result_of::begin<map_type>::type>::type>::type, std::string>::value));
        BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::value_of_data<boost::fusion::result_of::next<boost::fusion::result_of::next<boost::fusion::result_of::begin<map_type>::type>::type>::type>::type, int>::value));

        // Test random access interface.
        pair<int, char> a = at_c<0>(m); (void) a;
        pair<double, std::string> b = at_c<1>(m);
        pair<abstract, int> c = at_c<2>(m);
    }

    // iterators & random access interface.
    {
        typedef pair<boost::mpl::int_<0>, std::string> pair0;
        typedef pair<boost::mpl::int_<1>, std::string> pair1;
        typedef pair<boost::mpl::int_<2>, std::string> pair2;
        typedef pair<boost::mpl::int_<3>, std::string> pair3;
        typedef pair<boost::mpl::int_<4>, std::string> pair4;

        typedef map< pair0, pair1, pair2, pair3, pair4 > map_type;
        map_type m( pair0("zero"), pair1("one"), pair2("two"), pair3("three"), pair4("four") );
        BOOST_AUTO( it0, begin(m) );
        BOOST_TEST((deref(it0) == pair0("zero")));
        BOOST_AUTO( it1, fusion::next(it0) );
        BOOST_TEST((deref(it1) == pair1("one")));
        BOOST_AUTO( it2, fusion::next(it1) );
        BOOST_TEST((deref(it2) == pair2("two")));
        BOOST_AUTO( it3, fusion::next(it2) );
        BOOST_TEST((deref(it3) == pair3("three")));
        BOOST_AUTO( it4, fusion::next(it3) );
        BOOST_TEST((deref(it4) == pair4("four")));

        BOOST_TEST((deref(fusion::advance_c<4>(it0)) == deref(it4)));

        // Bi-directional
        BOOST_TEST((deref(fusion::prior(it4)) == deref(it3) ));
        BOOST_TEST((deref(fusion::prior(it3)) == deref(it2) ));
        BOOST_TEST((deref(fusion::prior(it2)) == deref(it1) ));
        BOOST_TEST((deref(fusion::prior(it1)) == deref(it0) ));
    }

    {
        std::cout << make_map<char, int>('X', 123) << std::endl;
        BOOST_TEST(at_key<char>(make_map<char, int>('X', 123)) == 'X');
        BOOST_TEST(at_key<int>(make_map<char, int>('X', 123)) == 123);
    }
    
    {
        // test for copy construction of fusion pairs
        // make sure that the correct constructor is called
        pair<int, copy_all> p1;
        pair<int, copy_all> p2 = p1;
    }
    
    {
        // compile test only
        // make sure result_of::deref_data returns a reference
        typedef map<pair<float, int> > map_type;
        typedef boost::fusion::result_of::begin<map_type>::type i_type;
        typedef boost::fusion::result_of::deref_data<i_type>::type r_type;
        BOOST_STATIC_ASSERT((boost::is_same<r_type, int&>::value));
    }
    
    {
        // compile test only
        // make sure result_of::deref_data is const correct
        typedef map<pair<float, int> > const map_type;
        typedef boost::fusion::result_of::begin<map_type>::type i_type;
        typedef boost::fusion::result_of::deref_data<i_type>::type r_type;
        BOOST_STATIC_ASSERT((boost::is_same<r_type, int const&>::value));
    }

    return boost::report_errors();
}