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

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2013.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   explicit_operator_bool.cpp
   9  * \author Andrey Semashev
  10  * \date   17.07.2010
  11  *
  12  * \brief  This test checks that explicit operator bool can be used in
  13  *         the valid contexts.
  14  */
  15
  16 #define BOOST_TEST_MODULE explicit_operator_bool
  17
  18 #include <boost/utility/explicit_operator_bool.hpp>
  19
  20 namespace {
  21
  22     // A test object that has the operator of explicit conversion to bool
  23     struct checkable1
  24     {
  25         BOOST_EXPLICIT_OPERATOR_BOOL()
  26         bool operator! () const
  27         {
  28             return false;
  29         }
  30     };
  31
  32     struct checkable2
  33     {
  34         BOOST_CONSTEXPR_EXPLICIT_OPERATOR_BOOL()
  35         BOOST_CONSTEXPR bool operator! () const
  36         {
  37             return false;
  38         }
  39     };
  40
  41 } // namespace
  42
  43 int main(int, char*[])
  44 {
  45     checkable1 val1;
  46     if (val1)
  47     {
  48         checkable2 val2;
  49         if (val2)
  50             return 0;
  51     }
  52
  53     return 1;
  54 }