| // boost/filesystem/detail/macro_value.hpp -------------------------------------------// |
| |
| // (C) Copyright John Maddock 2001 - 2003 |
| // (C) Copyright Jens Maurer 2001 |
| // (C) Copyright Peter Dimov 2001 |
| // (C) Copyright Darin Adler 2001 |
| // (C) Copyright Beman Dawes 2002 |
| |
| // Distributed under the Boost Software License, Version 1.0. |
| // See http://www.boost.org/LICENSE_1_0.txt |
| |
| // Library home page: http://www.boost.org/libs/filesystem |
| |
| //--------------------------------------------------------------------------------------// |
| |
| #ifndef BOOST_FILESYSTEM_MACRO_VALUE_HPP |
| #define BOOST_FILESYSTEM_MACRO_VALUE_HPP |
| |
| #include <boost/config.hpp> |
| #include <boost/assert.hpp> |
| #include <cstdlib> |
| |
| namespace boost |
| { |
| namespace detail |
| { |
| inline const char* macro_value(const char* name, const char* value) |
| { |
| static const char* no_value = "[no value]"; |
| static const char* not_defined = "[not defined]"; |
| |
| BOOST_ASSERT_MSG(name, "name argument must not be a null pointer"); |
| BOOST_ASSERT_MSG(value, "value argument must not be a null pointer"); |
| |
| return strcmp(name, value + 1) |
| ? ((*value && *(value+1)) ? (value+1) : no_value) |
| : not_defined; // name == value+1 so the macro is not defined |
| } |
| } // detail |
| } // boost |
| |
| #define BOOST_MACRO_VALUE(X) boost::detail::macro_value(#X, BOOST_STRINGIZE(=X)) |
| |
| #endif // BOOST_FILESYSTEM_MACRO_VALUE_HPP |