ceph/src/boost/libs/optional/test/optional_test_sfinae_friendly_value_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 #endif
  37
  38 int main() { }