ceph/src/boost/libs/variant/test/issue53.cpp

   1 //-----------------------------------------------------------------------------
   2 // boost-libs variant/test/issue53.cpp source file
   3 // See http://www.boost.org for updates, documentation, and revision history.
   4 //-----------------------------------------------------------------------------
   5 //
   6 // Copyright (c) 2019-2022 Antony Polukhin
   7 //
   8 // Distributed under the Boost Software License, Version 1.0. (See
   9 // accompanying file LICENSE_1_0.txt or copy at
  10 // http://www.boost.org/LICENSE_1_0.txt)
  11
  12 // Test case from https://github.com/boostorg/variant/issues/53
  13
  14 #include <boost/variant.hpp>
  15 #include <boost/thread/lock_guard.hpp> // this line was causing problems on MSVC
  16
  17 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  18
  19 struct spanac {};
  20
  21 struct ceapa{
  22     double a,b;
  23 };
  24
  25 typedef boost::variant<spanac, ceapa> var_t;
  26
  27 struct visitor_t : public boost::static_visitor<bool> {
  28     bool operator() (const spanac&) const {
  29         return true;
  30     }
  31
  32     bool operator() (const ceapa&) const {
  33         return false;
  34     }
  35
  36 private:
  37     double a, b;
  38 };
  39
  40 var_t get(int k) {
  41     if (k)
  42         return spanac();
  43     else
  44         return ceapa();
  45 }
  46
  47 int main(int argc, const char** argv) {
  48     visitor_t v;
  49
  50     bool result = boost::apply_visitor(v, get(argc - 1));
  51     (void)result;
  52 }
  53
  54 #else // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  55
  56 int main() {}
  57
  58 #endif // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES