ceph/src/boost/libs/conversion/test/implicit_cast.cpp

   1 // Copyright David Abrahams 2003.
   2 // Distributed under the Boost Software License, Version 1.0. (See
   3 // accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #include <boost/implicit_cast.hpp>
   7 #include <boost/detail/lightweight_test.hpp>
   8 #include <boost/type.hpp>
   9 using boost::implicit_cast;
  10 using boost::type;
  11
  12 template <class T>
  13 type<T> check_return(T) { return type<T>(); }
  14
  15 struct foo
  16 {
  17     foo(char const*) {}
  18     operator long() const { return 0; }
  19 };
  20
  21 typedef type<long> long_type;
  22 typedef type<foo> foo_type;
  23
  24 int main()
  25 {
  26     type<long> x = check_return(boost::implicit_cast<long>(1));
  27     BOOST_TEST(boost::implicit_cast<long>(1) == 1L);
  28
  29     type<foo> f = check_return(boost::implicit_cast<foo>("hello"));
  30     type<long> z = check_return(boost::implicit_cast<long>(foo("hello")));
  31
  32     // warning suppression:
  33     (void)x;
  34     (void)f;
  35     (void)z;
  36
  37     return boost::report_errors();
  38 }