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