ceph/src/boost/libs/mp11/test/mp_fold.cpp

   1
   2 //  Copyright 2015 Peter Dimov.
   3 //
   4 // Distributed under the Boost Software License, Version 1.0.
   5 //
   6 // See accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt
   8
   9
  10 #include <boost/mp11/algorithm.hpp>
  11 #include <boost/mp11/list.hpp>
  12 #include <boost/mp11/integral.hpp>
  13 #include <boost/core/lightweight_test_trait.hpp>
  14 #include <boost/config.hpp>
  15 #include <boost/detail/workaround.hpp>
  16 #include <type_traits>
  17 #include <tuple>
  18
  19 struct X1 {};
  20 struct X2 {};
  21 struct X3 {};
  22 struct X4 {};
  23
  24 template<class T1, class T2> struct F {};
  25
  26 using boost::mp11::mp_plus;
  27
  28 int main()
  29 {
  30     using boost::mp11::mp_list;
  31     using boost::mp11::mp_fold;
  32
  33     {
  34         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<>, void, F>, void>));
  35         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1>, void, F>, F<void, X1>>));
  36         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1, X2>, void, F>, F<F<void, X1>, X2>>));
  37         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1, X2, X3>, void, F>, F<F<F<void, X1>, X2>, X3>>));
  38         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1, X2, X3, X4>, void, F>, F<F<F<F<void, X1>, X2>, X3>, X4>>));
  39     }
  40
  41     {
  42         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<>, void, F>, void>));
  43         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1>, void, F>, F<void, X1>>));
  44         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2>, void, F>, F<F<void, X1>, X2>>));
  45         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3>, void, F>, F<F<F<void, X1>, X2>, X3>>));
  46         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, void, F>, F<F<F<F<void, X1>, X2>, X3>, X4>>));
  47     }
  48
  49     using boost::mp11::mp_push_back;
  50
  51     {
  52         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, mp_list<>, mp_push_back>, mp_list<X1, X2, X3, X4>>));
  53     }
  54
  55     using boost::mp11::mp_push_front;
  56
  57     {
  58         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, mp_list<>, mp_push_front>, mp_list<X4, X3, X2, X1>>));
  59     }
  60
  61     using boost::mp11::mp_iota_c;
  62     using boost::mp11::mp_reverse;
  63     using boost::mp11::mp_size_t;
  64
  65     {
  66         int const N = 37;
  67
  68         using L = mp_iota_c<N>;
  69
  70         using R1 = mp_fold<L, mp_list<>, mp_push_back>;
  71         BOOST_TEST_TRAIT_TRUE((std::is_same<R1, L>));
  72
  73         using R2 = mp_fold<L, mp_list<>, mp_push_front>;
  74         BOOST_TEST_TRAIT_TRUE((std::is_same<R2, mp_reverse<L>>));
  75
  76         using R3 = mp_fold<L, mp_size_t<0>, mp_plus>;
  77         BOOST_TEST_TRAIT_TRUE((std::is_same<R3, mp_size_t<N*(N-1)/2>>));
  78     }
  79
  80     return boost::report_errors();
  81 }