ceph/src/boost/libs/core/test/eif_dummy_arg_disambiguation.cpp

   1 // Boost enable_if library
   2
   3 // Copyright 2003 (c) The Trustees of Indiana University.
   4
   5 // Use, modification, and distribution is subject to the Boost Software
   6 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8
   9 //    Authors: Jaakko Jarvi (jajarvi at osl.iu.edu)
  10 //             Jeremiah Willcock (jewillco at osl.iu.edu)
  11 //             Andrew Lumsdaine (lums at osl.iu.edu)
  12
  13 #include <boost/utility/enable_if.hpp>
  14 #include <boost/type_traits/is_arithmetic.hpp>
  15 #include <boost/core/lightweight_test.hpp>
  16
  17 using boost::enable_if;
  18 using boost::disable_if;
  19 using boost::is_arithmetic;
  20
  21 template <int N> struct dummy {
  22   dummy(int) {};
  23 };
  24
  25 template<class T>
  26 typename enable_if<is_arithmetic<T>, bool>::type
  27 arithmetic_object(T t, dummy<0> = 0) { return true; }
  28
  29 template<class T>
  30 typename disable_if<is_arithmetic<T>, bool>::type
  31 arithmetic_object(T t, dummy<1> = 0) { return false; }
  32
  33
  34 int main()
  35 {
  36
  37   BOOST_TEST(arithmetic_object(1));
  38   BOOST_TEST(arithmetic_object(1.0));
  39
  40   BOOST_TEST(!arithmetic_object("1"));
  41   BOOST_TEST(!arithmetic_object(static_cast<void*>(0)));
  42
  43   return boost::report_errors();
  44 }
  45