ceph/src/boost/boost/filesystem/detail/macro_value.hpp

   1 //  boost/filesystem/detail/macro_value.hpp  -------------------------------------------//
   2
   3 //  (C) Copyright John Maddock 2001 - 2003
   4 //  (C) Copyright Jens Maurer 2001
   5 //  (C) Copyright Peter Dimov 2001
   6 //  (C) Copyright Darin Adler 2001
   7 //  (C) Copyright Beman Dawes 2002
   8
   9 //  Distributed under the Boost Software License, Version 1.0.
  10 //  See http://www.boost.org/LICENSE_1_0.txt
  11
  12 //  Library home page: http://www.boost.org/libs/filesystem
  13
  14 //--------------------------------------------------------------------------------------//
  15
  16 #ifndef BOOST_FILESYSTEM_MACRO_VALUE_HPP
  17 #define BOOST_FILESYSTEM_MACRO_VALUE_HPP
  18
  19 #include <boost/config.hpp>
  20 #include <boost/assert.hpp>
  21 #include <cstdlib>
  22
  23 namespace boost
  24 {
  25   namespace detail
  26   {
  27     inline const char* macro_value(const char* name, const char* value)
  28     {
  29       static const char* no_value = "[no value]";
  30       static const char* not_defined = "[not defined]";
  31
  32       BOOST_ASSERT_MSG(name, "name argument must not be a null pointer");
  33       BOOST_ASSERT_MSG(value, "value argument must not be a null pointer");
  34
  35       return strcmp(name, value + 1)
  36         ? ((*value && *(value+1)) ? (value+1) : no_value)
  37         : not_defined; // name == value+1 so the macro is not defined
  38     }
  39   }  // detail
  40 }  // boost
  41
  42 #define BOOST_MACRO_VALUE(X) boost::detail::macro_value(#X, BOOST_STRINGIZE(=X))
  43
  44 #endif  // BOOST_FILESYSTEM_MACRO_VALUE_HPP