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- // Copyright (c) 2018-2019
- // Cem Bassoy
- //
- // 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)
- //
- // The authors gratefully acknowledge the support of
- // Fraunhofer and Google in producing this work
- // which started as a Google Summer of Code project.
- //
- #ifndef _BOOST_UBLAS_TEST_TENSOR_UTILITY_
- #define _BOOST_UBLAS_TEST_TENSOR_UTILITY_
- template<class ... types>
- struct zip_helper;
- template<class type1, class ... types3>
- struct zip_helper<std::tuple<types3...>, type1>
- {
- template<class ... types2>
- struct with
- {
- using type = std::tuple<types3...,std::pair<type1,types2>...>;
- };
- template<class ... types2>
- using with_t = typename with<types2...>::type;
- };
- template<class type1, class ... types3, class ... types1>
- struct zip_helper<std::tuple<types3...>, type1, types1...>
- {
- template<class ... types2>
- struct with
- {
- using next_tuple = std::tuple<types3...,std::pair<type1,types2>...>;
- using type = typename zip_helper<next_tuple, types1...>::template with<types2...>::type;
- };
- template<class ... types2>
- using with_t = typename with<types2...>::type;
- };
- template<class ... types>
- using zip = zip_helper<std::tuple<>,types...>;
- // creates e.g.
- // using test_types = zip<long,float>::with_t<first_order,last_order>; // equals
- // using test_types = std::tuple< std::pair<float, first_order>, std::pair<float, last_order >, std::pair<double,first_order>, std::pair<double,last_order >
- //>;
- //static_assert(std::is_same< std::tuple_element_t<0,std::tuple_element_t<0,test_types2>>, float>::value,"should be float ");
- //static_assert(std::is_same< std::tuple_element_t<1,std::tuple_element_t<0,test_types2>>, boost::numeric::ublas::first_order>::value,"should be boost::numeric::ublas::first_order ");
- #endif
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