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Diffstat (limited to 'boost/local_function/aux_/symbol.hpp')
| -rw-r--r-- | boost/local_function/aux_/symbol.hpp | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/boost/local_function/aux_/symbol.hpp b/boost/local_function/aux_/symbol.hpp new file mode 100644 index 0000000000..859fed6501 --- /dev/null +++ b/boost/local_function/aux_/symbol.hpp @@ -0,0 +1,50 @@ + +// Copyright (C) 2009-2012 Lorenzo Caminiti +// Distributed under the Boost Software License, Version 1.0 +// (see accompanying file LICENSE_1_0.txt or a copy at +// http://www.boost.org/LICENSE_1_0.txt) +// Home at http://www.boost.org/libs/local_function + +#ifndef BOOST_LOCAL_FUNCTION_AUX_SYMBOL_HPP_ +#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_HPP_ + +#include <boost/preprocessor/cat.hpp> +#include <boost/preprocessor/seq/cat.hpp> +#include <boost/preprocessor/seq/transform.hpp> + +// PRIVATE // + +// NOTE: INFIX is used to separate symbols concatenated together. Some of these +// symbols are user-defined so they can be anything. Because they can contain +// underscore `_` and/or start with capital letters, it is NOT safe for the +// INFIX to be the underscore `_` character because that could lead to library +// defined symbols containing double underscores `__` or a leading underscore +// (followed or not by a capital letter) in the global namespace. All these +// symbols are reserved by the C++ standard: (1) "each name that contains a +// double underscore (_ _) or begins with an underscore followed by an +// uppercase letter is reserved to the implementation" and (2) "each name that +// begins with an underscore is reserved to the implementation for use as a +// name in the global namespace". +#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_INFIX_ X // `X` used as separator. + +#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_PREFIX_ boost_local_function_aux + +#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX_(s, unused, tokens) \ + BOOST_PP_CAT(tokens, BOOST_LOCAL_FUNCTION_AUX_SYMBOL_INFIX_) + +// PUBLIC // + +// Prefixes this library reserved symbol. +#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL(seq) \ + BOOST_PP_SEQ_CAT(BOOST_PP_SEQ_TRANSFORM( \ + BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX_, \ + ~, (BOOST_LOCAL_FUNCTION_AUX_SYMBOL_PREFIX_) seq )) + +// Postfixes this library reserved symbol. +#define BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX(seq) \ + BOOST_PP_SEQ_CAT(BOOST_PP_SEQ_TRANSFORM( \ + BOOST_LOCAL_FUNCTION_AUX_SYMBOL_POSTFIX_, \ + ~, seq (BOOST_LOCAL_FUNCTION_AUX_SYMBOL_PREFIX_) )) + +#endif // #include guard + |