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-rw-r--r--boost/filesystem/detail/macro_value.hpp44
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+// 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