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

   1 // { dg-do run { target c++11 } }
   2 //
   3 // Copyright (C) 2011-2020 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <tr2/type_traits>
  21 #include <typeinfo>
  22 #include <stdexcept>
  23
  24 struct A { };
  25 struct B1 : virtual public A { };
  26 struct B2 : virtual public A { };
  27 struct C : public B1, public B2 { };
  28
  29 void test()
  30 {
  31   // 1
  32   {
  33     typedef std::tr2::bases<A>::type tl;
  34     static_assert(tl::empty::value, "error");
  35   }
  36
  37   // 2
  38   {
  39     typedef std::tr2::bases<B1>::type tl1;
  40     typedef std::tr2::bases<B2>::type tl2;
  41
  42     // Sanity check w/ runtime.
  43     bool eq = typeid(tl1) == typeid(tl2);
  44     if (!eq)
  45       throw std::logic_error("typelist not equal");
  46
  47     // Sanity check.
  48     static_assert(tl1::empty::value != std::true_type::value, "!empty");
  49     static_assert(tl2::empty::value != std::true_type::value, "!empty");
  50
  51     typedef tl1::first::type            tl1_first;
  52     typedef tl1::rest::type             tl1_rest;
  53     typedef tl2::first::type            tl2_first;
  54     typedef tl2::rest::type             tl2_rest;
  55
  56     eq = typeid(tl1_first) == typeid(tl2_first);
  57     if (!eq)
  58       throw std::logic_error("base not equal");
  59
  60     static_assert(tl1_rest::empty::value == std::true_type::value, "empty");
  61     static_assert(tl2_rest::empty::value == std::true_type::value, "empty");
  62   }
  63
  64   // 3
  65   {
  66     typedef std::tr2::bases<C>::type tl;
  67
  68     // Sanity check.
  69     static_assert(tl::empty::value != std::true_type::value, "!empty");
  70
  71     typedef tl::first::type             tl1_first;
  72     typedef tl::rest::type              tl2;
  73     typedef tl2::first::type            tl2_first;
  74     typedef tl2::rest::type             tl3;
  75     typedef tl3::first::type            tl3_first;
  76     typedef tl3::rest::type             tl4;
  77
  78     bool eq = typeid(tl1_first) == typeid(tl2_first);
  79     if (eq)
  80       throw std::logic_error("bases are not equal");
  81
  82     eq = typeid(tl2_first) == typeid(tl3_first);
  83     if (eq)
  84       throw std::logic_error("bases are not equal");
  85
  86     static_assert(tl4::empty::value == std::true_type::value, "empty");
  87   }
  88
  89 }
  90
  91 int main()
  92 {
  93   test();
  94   return 0;
  95 }