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Viewing changes to libs/fusion/test/sequence/transform_view.cpp

  • Committer: Package Import Robot
  • Author(s): Steve M. Robbins
  • Date: 2012-02-26 00:31:44 UTC
  • Revision ID: package-import@ubuntu.com-20120226003144-eaytp12cbf6ubpms
Tags: upstream-1.49.0
Import upstream version 1.49.0

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libs/fusion/test/sequence/transform_view.cpp
 
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/*=============================================================================
 
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    Copyright (c) 2001-2011 Joel de Guzman
 
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    Distributed under the Boost Software License, Version 1.0. (See accompanying 
 
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    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
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==============================================================================*/
 
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#include <boost/detail/lightweight_test.hpp>
 
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#include <boost/fusion/container/vector/vector.hpp>
 
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#include <boost/fusion/adapted/mpl.hpp>
 
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#include <boost/fusion/sequence/io/out.hpp>
 
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#include <boost/fusion/container/generation/make_vector.hpp>
 
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#include <boost/fusion/sequence/comparison/equal_to.hpp>
 
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#include <boost/fusion/view/transform_view/transform_view.hpp>
 
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#include <boost/fusion/sequence/intrinsic/begin.hpp>
 
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#include <boost/fusion/sequence/intrinsic/at.hpp>
 
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#include <boost/fusion/sequence/intrinsic/value_at.hpp>
 
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#include <boost/fusion/iterator/next.hpp>
 
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#include <boost/fusion/iterator/prior.hpp>
 
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#include <boost/fusion/iterator/advance.hpp>
 
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#include <boost/fusion/iterator/deref.hpp>
 
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#include <boost/fusion/iterator/distance.hpp>
 
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#include <boost/mpl/range_c.hpp>
 
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#include <boost/mpl/assert.hpp>
 
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#include <boost/type_traits/is_same.hpp>
 
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struct square
 
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{
 
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    template<typename T>
 
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    struct result;
 
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    template <typename T>
 
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    struct result<square(T)>
 
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    {
 
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        typedef int type;
 
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    };
 
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    template <typename T>
 
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    int operator()(T x) const
 
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    {
 
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        return x * x;
 
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    }
 
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};
 
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struct add
 
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{
 
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    template<typename T>
 
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    struct result;
 
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    template <typename A, typename B>
 
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    struct result<add(A,B)>
 
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    {
 
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        typedef int type;
 
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    };
 
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    template <typename A, typename B>
 
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    int operator()(A a, B b) const
 
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    {
 
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        return a + b;
 
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    }
 
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};
 
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int
 
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main()
 
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{
 
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    using namespace boost::fusion;
 
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    std::cout << tuple_open('[');
 
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    std::cout << tuple_close(']');
 
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    std::cout << tuple_delimiter(", ");
 
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/// Testing the transform_view
 
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    {
 
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        typedef boost::mpl::range_c<int, 5, 9> sequence_type;
 
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        sequence_type sequence;
 
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        square sq;
 
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        typedef transform_view<sequence_type, square> xform_type;
 
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        xform_type xform(sequence, sq);
 
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        std::cout << xform << std::endl;
 
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        BOOST_TEST((xform == make_vector(25, 36, 49, 64)));
 
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        typedef boost::fusion::result_of::begin<xform_type>::type first_type;
 
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        first_type first_it(boost::fusion::begin(xform));
 
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        typedef boost::fusion::result_of::next<first_type>::type next_type;
 
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        next_type next_it(boost::fusion::next(first_it));
 
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        BOOST_TEST((*next_it == 36));
 
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        BOOST_TEST((*boost::fusion::prior(next_it) == 25));
 
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        BOOST_TEST((boost::fusion::distance(first_it, next_it) == 1));
 
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        BOOST_TEST((*boost::fusion::advance_c<3>(boost::fusion::begin(xform)) == 64));
 
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        BOOST_TEST((boost::fusion::at_c<2>(xform) == 49));
 
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        BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_at_c<xform_type, 0>::type, int>));
 
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    }
 
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    {
 
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        typedef boost::mpl::range_c<int, 5, 9> sequence1_type;
 
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        typedef boost::mpl::range_c<int, 10, 14> sequence2_type;
 
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        sequence1_type sequence1;
 
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        sequence2_type sequence2;
 
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        add f;
 
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        typedef transform_view<sequence1_type, sequence2_type, add> xform_type;
 
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        xform_type xform(sequence1, sequence2, f);
 
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        std::cout << xform << std::endl;
 
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        BOOST_TEST((xform == make_vector(15, 17, 19, 21)));
 
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        BOOST_TEST((boost::fusion::at_c<2>(xform) == 19));
 
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        BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_at_c<xform_type, 0>::type, int>));
 
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    }
 
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    return boost::report_errors();
 
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}
 
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