51 lines
2.1 KiB
C++
51 lines
2.1 KiB
C++
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// Copyright (C) 2009-2012 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0
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// (see accompanying file LICENSE_1_0.txt or a copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Home at http://www.boost.org/libs/local_function
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#ifndef BOOST_LOCAL_FUNCTION_AUX_SYMBOL_HPP_
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#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_HPP_
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/seq/cat.hpp>
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#include <boost/preprocessor/seq/transform.hpp>
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// PRIVATE //
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// NOTE: INFIX is used to separate symbols concatenated together. Some of these
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// symbols are user-defined so they can be anything. Because they can contain
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// underscore `_` and/or start with capital letters, it is NOT safe for the
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// INFIX to be the underscore `_` character because that could lead to library
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// defined symbols containing double underscores `__` or a leading underscore
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// (followed or not by a capital letter) in the global namespace. All these
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// symbols are reserved by the C++ standard: (1) "each name that contains a
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// double underscore (_ _) or begins with an underscore followed by an
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// uppercase letter is reserved to the implementation" and (2) "each name that
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// begins with an underscore is reserved to the implementation for use as a
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// name in the global namespace".
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#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_INFIX_ X // `X` used as separator.
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#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_PREFIX_ boost_local_function_aux
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#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX_(s, unused, tokens) \
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BOOST_PP_CAT(tokens, BOOST_LOCAL_FUNCTION_AUX_SYMBOL_INFIX_)
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// PUBLIC //
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// Prefixes this library reserved symbol.
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#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL(seq) \
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BOOST_PP_SEQ_CAT(BOOST_PP_SEQ_TRANSFORM( \
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BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX_, \
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~, (BOOST_LOCAL_FUNCTION_AUX_SYMBOL_PREFIX_) seq ))
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// Postfixes this library reserved symbol.
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#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX(seq) \
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BOOST_PP_SEQ_CAT(BOOST_PP_SEQ_TRANSFORM( \
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BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX_, \
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~, seq (BOOST_LOCAL_FUNCTION_AUX_SYMBOL_PREFIX_) ))
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#endif // #include guard
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