Chris@16: 
Chris@16: // Copyright (C) 2009-2012 Lorenzo Caminiti
Chris@16: // Distributed under the Boost Software License, Version 1.0
Chris@16: // (see accompanying file LICENSE_1_0.txt or a copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: // Home at http://www.boost.org/libs/local_function
Chris@16: 
Chris@16: #ifndef BOOST_LOCAL_FUNCTION_AUX_SYMBOL_HPP_
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_HPP_
Chris@16: 
Chris@16: #include <boost/preprocessor/cat.hpp>
Chris@16: #include <boost/preprocessor/seq/cat.hpp>
Chris@16: #include <boost/preprocessor/seq/transform.hpp>
Chris@16: 
Chris@16: // PRIVATE //
Chris@16: 
Chris@16: // NOTE: INFIX is used to separate symbols concatenated together. Some of these
Chris@16: // symbols are user-defined so they can be anything. Because they can contain
Chris@16: // underscore `_` and/or start with capital letters, it is NOT safe for the
Chris@16: // INFIX to be the underscore `_` character because that could lead to library
Chris@16: // defined symbols containing double underscores `__` or a leading underscore
Chris@16: // (followed or not by a capital letter) in the global namespace. All these
Chris@16: // symbols are reserved by the C++ standard: (1) "each name that contains a
Chris@16: // double underscore (_ _) or begins with an underscore followed by an
Chris@16: // uppercase letter is reserved to the implementation" and (2) "each name that
Chris@16: // begins with an underscore is reserved to the implementation for use as a
Chris@16: // name in the global namespace".
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_INFIX_ X // `X` used as separator.
Chris@16:             
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_PREFIX_ boost_local_function_aux
Chris@16: 
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX_(s, unused, tokens) \
Chris@16:     BOOST_PP_CAT(tokens, BOOST_LOCAL_FUNCTION_AUX_SYMBOL_INFIX_)
Chris@16: 
Chris@16: // PUBLIC //
Chris@16: 
Chris@16: // Prefixes this library reserved symbol.
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_SYMBOL(seq) \
Chris@16:     BOOST_PP_SEQ_CAT(BOOST_PP_SEQ_TRANSFORM( \
Chris@16:             BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX_, \
Chris@16:             ~, (BOOST_LOCAL_FUNCTION_AUX_SYMBOL_PREFIX_) seq ))
Chris@16: 
Chris@16: // Postfixes this library reserved symbol.
Chris@16: #define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX(seq) \
Chris@16:     BOOST_PP_SEQ_CAT(BOOST_PP_SEQ_TRANSFORM( \
Chris@16:             BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX_, \
Chris@16:             ~, seq (BOOST_LOCAL_FUNCTION_AUX_SYMBOL_PREFIX_) ))
Chris@16: 
Chris@16: #endif // #include guard
Chris@16: