libstdc++-v3/testsuite/tr2/direct_bases/value.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target rtti }
   3 //
   4 // Copyright (C) 2011-2023 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <tr2/type_traits>
  22 #include <typeinfo>
  23 #include <stdexcept>
  24
  25 struct A { };
  26 struct B1 : virtual public A { };
  27 struct B2 : virtual public A { };
  28 struct C : public B1, public B2 { };
  29
  30 void test()
  31 {
  32   // 1
  33   {
  34     typedef std::tr2::direct_bases<A>::type tl;
  35     static_assert(tl::empty::value, "error");
  36   }
  37
  38   // 2
  39   {
  40     typedef std::tr2::direct_bases<B1>::type tl1;
  41     typedef std::tr2::direct_bases<B2>::type tl2;
  42
  43     // Sanity check w/ runtime.
  44     bool eq = typeid(tl1) == typeid(tl2);
  45     if (!eq)
  46       throw std::logic_error("typelist not equal");
  47
  48     // Sanity check.
  49     static_assert(tl1::empty::value != std::true_type::value, "!empty");
  50     static_assert(tl2::empty::value != std::true_type::value, "!empty");
  51
  52     typedef tl1::first::type            tl1_first;
  53     typedef tl1::rest::type             tl1_rest;
  54     typedef tl2::first::type            tl2_first;
  55     typedef tl2::rest::type             tl2_rest;
  56
  57     eq = typeid(tl1_first) == typeid(tl2_first);
  58     if (!eq)
  59       throw std::logic_error("base not equal");
  60
  61     static_assert(tl1_rest::empty::value == std::true_type::value, "empty");
  62     static_assert(tl2_rest::empty::value == std::true_type::value, "empty");
  63   }
  64
  65   // 3
  66   {
  67     typedef std::tr2::direct_bases<C>::type tl;
  68
  69     // Sanity check.
  70     static_assert(tl::empty::value != std::true_type::value, "!empty");
  71
  72     typedef tl::first::type             tl1_first;
  73     typedef tl::rest::type              tl2;
  74     typedef tl2::first::type            tl2_first;
  75     typedef tl2::rest::type             tl3;
  76
  77     bool eq = typeid(tl1_first) == typeid(tl2_first);
  78     if (eq)
  79       throw std::logic_error("bases are not equal");
  80
  81     static_assert(tl3::empty::value == std::true_type::value, "empty");
  82   }
  83
  84 }
  85
  86 int main()
  87 {
  88   test();
  89   return 0;
  90 }