ceph/src/boost/libs/hana/test/detail/first_unsatisfied_index.cpp

   1 // Copyright Louis Dionne 2013-2016
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   4
   5 #include <boost/hana/detail/first_unsatisfied_index.hpp>
   6
   7 #include <boost/hana/not_equal.hpp>
   8 #include <laws/base.hpp>
   9
  10 #include <type_traits>
  11 namespace hana = boost::hana;
  12 using hana::test::ct_eq;
  13
  14
  15 struct poison {
  16     poison() = default;
  17     poison(poison const&) = delete;
  18 };
  19
  20 int main() {
  21     auto predicate = [](auto x) {
  22         static_assert(!std::is_same<poison, decltype(x)>::value, "");
  23         return hana::not_equal(x, ct_eq<9>{});
  24     };
  25
  26     using Find = hana::detail::first_unsatisfied_index<decltype(predicate)>;
  27
  28     static_assert(decltype(Find{}())::value == 0, "");
  29
  30     static_assert(decltype(Find{}(ct_eq<9>{}))::value == 0, "");
  31     static_assert(decltype(Find{}(ct_eq<0>{}))::value == 1, "");
  32
  33     static_assert(decltype(Find{}(ct_eq<9>{}, poison{}))::value == 0, "");
  34     static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<9>{}))::value == 1, "");
  35     static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}))::value == 2, "");
  36
  37     static_assert(decltype(Find{}(ct_eq<9>{}, poison{}, poison{}))::value == 0, "");
  38     static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<9>{}, poison{}))::value == 1, "");
  39     static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<9>{}))::value == 2, "");
  40     static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}))::value == 3, "");
  41
  42     static_assert(decltype(Find{}(ct_eq<9>{}, poison{}, poison{}, poison{}))::value == 0, "");
  43     static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<9>{}, poison{}, poison{}))::value == 1, "");
  44     static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<9>{}, poison{}))::value == 2, "");
  45     static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<9>{}))::value == 3, "");
  46     static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}))::value == 4, "");
  47 }