ceph/src/boost/libs/config/test/boost_no_decltype.ipp

   1
   2 //  (C) Copyright Beman Dawes 2008
   3
   4 //  Use, modification and distribution are subject to the
   5 //  Boost Software License, Version 1.0. (See accompanying file
   6 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 //  See http://www.boost.org/libs/config for more information.
   9
  10 //  MACRO:         BOOST_NO_CXX11_DECLTYPE
  11 //  TITLE:         C++0x decltype unavailable
  12 //  DESCRIPTION:   The compiler does not support C++0x decltype
  13
  14 namespace boost_no_cxx11_decltype {
  15
  16 void quiet_warning(int){}
  17
  18 struct test_class
  19 {
  20    test_class() {}
  21 };
  22
  23 test_class get_test_class()
  24 {
  25    return test_class();
  26 }
  27
  28 template<typename F>
  29 void baz(F f)
  30 {
  31     //
  32     // Strangely VC-10 deduces the return type of F
  33     // to be "test_class&".  Remove the constructor
  34     // from test_class and then decltype does work OK!!
  35     //
  36     typedef decltype(f()) res;
  37     res r;
  38 }
  39
  40 int test()
  41 {
  42   int i;
  43   decltype(i) j(0);
  44   quiet_warning(j);
  45   decltype(get_test_class()) k;
  46   #ifndef _MSC_VER
  47   // Although the VC++ decltype is buggy, we none the less enable support,
  48   // so don't test the bugs for now!
  49   baz(get_test_class);
  50   #endif
  51   return 0;
  52 }
  53
  54 }