ceph/src/boost/libs/variant/test/no_rvalue_to_nonconst_visitation.cpp

   1 // Copyright (c) 2017 Antony Polukhin
   2 //
   3 // Distributed under the Boost Software License, Version 1.0. (See
   4 // accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include "boost/config.hpp"
   8 #include "boost/variant.hpp"
   9 #include <string>
  10
  11 struct some_user_provided_visitor_for_lvalues: boost::static_visitor<void> {
  12     void operator()(std::string& ) const {}
  13     void operator()(int ) const {}
  14 };
  15
  16 int main() {
  17     boost::apply_visitor(
  18         some_user_provided_visitor_for_lvalues(),
  19         boost::variant<int, std::string>("Hello")
  20     );
  21
  22 #ifdef BOOST_MSVC
  23 #   error Temporaries/rvalues could bind to non-const lvalues on MSVC compilers
  24 #endif
  25
  26     return 0;
  27 }