ceph/src/boost/libs/core/test/empty_value_size_test.cpp

   1 /*
   2 Copyright 2018 Glen Joseph Fernandes
   3 (glenjofe@gmail.com)
   4
   5 Distributed under the Boost Software License, Version 1.0.
   6 (http://www.boost.org/LICENSE_1_0.txt)
   7 */
   8 #include <boost/config.hpp>
   9 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
  10 #include <boost/core/empty_value.hpp>
  11 #include <boost/core/lightweight_test.hpp>
  12
  13 struct T1 { };
  14
  15 struct S1
  16     : boost::empty_value<T1, 0, true> { };
  17
  18 struct T2 {
  19     int value;
  20 };
  21
  22 struct S2
  23     : boost::empty_value<T1, 0, true>
  24     , boost::empty_value<T2, 1, true> { };
  25
  26 struct S3
  27     : boost::empty_value<T1, 0, false>
  28     , boost::empty_value<T2, 1, true> { };
  29
  30 struct T3 { };
  31
  32 struct S4
  33     : boost::empty_value<T1, 0, true>
  34     , boost::empty_value<T3, 1, true> { };
  35
  36 struct S5
  37     : boost::empty_value<T1, 0, false>
  38     , boost::empty_value<T3, 1, false> { };
  39
  40 struct S6
  41     : boost::empty_value<T1, 0, true>
  42     , boost::empty_value<T2, 1, true>
  43     , boost::empty_value<T3, 2, true> { };
  44
  45 int main()
  46 {
  47     BOOST_TEST(sizeof(S1) == sizeof(T1));
  48     BOOST_TEST(sizeof(S2) == sizeof(T2));
  49     BOOST_TEST(sizeof(S3) > sizeof(T2));
  50     BOOST_TEST(sizeof(S4) == sizeof(T1));
  51     BOOST_TEST(sizeof(S5) > sizeof(T1));
  52     BOOST_TEST(sizeof(S6) == sizeof(T2));
  53     return boost::report_errors();
  54 }
  55 #else
  56 int main()
  57 {
  58     return 0;
  59 }
  60 #endif