ceph/src/boost/libs/optional/test/optional_test_sfinae_friendly_ctor.cpp

   1 // Copyright (C) 2014 Andrzej Krzemienski.
   2 //
   3 // Use, modification, and distribution is subject to the Boost Software
   4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // See http://www.boost.org/lib/optional for documentation.
   8 //
   9 // You are welcome to contact the author at:
  10 //  akrzemi1@gmail.com
  11
  12 #include "boost/optional/optional.hpp"
  13
  14 #ifdef __BORLANDC__
  15 #pragma hdrstop
  16 #endif
  17
  18 using boost::optional;
  19
  20 #if (!defined BOOST_OPTIONAL_DETAIL_NO_IS_CONSTRUCTIBLE_TRAIT)
  21
  22 struct X {};
  23 struct Y {};
  24
  25 struct Resource
  26 {
  27   explicit Resource(const X&) {}
  28 };
  29
  30 BOOST_STATIC_ASSERT((  boost::is_constructible<Resource, const X&>::value ));
  31 BOOST_STATIC_ASSERT(( !boost::is_constructible<Resource, const Y&>::value ));
  32
  33 BOOST_STATIC_ASSERT((  boost::is_constructible<optional<Resource>, const X&>::value ));
  34 BOOST_STATIC_ASSERT(( !boost::is_constructible<optional<Resource>, const Y&>::value ));
  35
  36 #ifndef BOOST_OPTIONAL_DETAIL_NO_SFINAE_FRIENDLY_CONSTRUCTORS
  37 BOOST_STATIC_ASSERT((  boost::is_constructible< optional< optional<int> >, optional<int> >::value ));
  38 BOOST_STATIC_ASSERT(( !boost::is_constructible< optional<int>, optional< optional<int> > >::value ));
  39
  40 BOOST_STATIC_ASSERT((  boost::is_constructible< optional< optional<int> >, const optional<int>& >::value ));
  41 BOOST_STATIC_ASSERT(( !boost::is_constructible< optional<int>, const optional< optional<int> >& >::value ));
  42
  43 BOOST_STATIC_ASSERT((  boost::is_constructible<optional<Resource>, const optional<X>&>::value ));
  44 BOOST_STATIC_ASSERT(( !boost::is_constructible<optional<Resource>, const optional<Y>&>::value ));
  45 #endif
  46
  47 #endif
  48
  49 int main() { }