forked from boostorg/preprocessor
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
/* Copyright (C) 2001
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* Housemarque Oy
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* http://www.housemarque.com
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*
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* Permission to copy, use, modify, sell and distribute this software is
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* granted provided this copyright notice appears in all copies. This
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* software is provided "as is" without express or implied warranty, and
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* with no claim as to its suitability for any purpose.
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*
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* See http://www.boost.org for most recent version.
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*/
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#include <boost/preprocessor/enum_params.hpp>
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#include <boost/preprocessor/enum_shifted_params.hpp>
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#include <boost/preprocessor/inc.hpp>
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#include <boost/preprocessor/repeat_2nd.hpp>
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/* *** */
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/* RATIONALE:
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* - BOOST_PP_REPEAT, BOOST_PP_REPEAT_2ND, ... must work
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* together.
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* - BOOST_PP_REPEAT is already tested with
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* BOOST_PP_ENUM_PARAMS.
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* - The tested repeat count should exceed imaginable usage.
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* - Testing the generation of is_function_helper()s upto 40 arguments should
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* be sufficient in this case. Many compilers may fail the repetition tests
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* (at least with higher counts). However, the primary purpose of the
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* repetition primitives is to enable configurability with reasonable
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* defaults, and not necessarily "the most impressive repetition".
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* - ENUM_SHIFTED_PARAMS must be tested so that the shifted range is shown to
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* be correct.
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*/
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#ifndef IS_FUNCTION_HELPER_TEST_MAX
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#define IS_FUNCTION_HELPER_TEST_MAX 40
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#endif
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typedef char yes_type;
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#define IS_FUNCTION_HELPER(I,A)\
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template\
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<BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(I),class P)>\
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yes_type is_function_helper(\
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P0 (*)(BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_INC(I),P)));
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BOOST_PP_REPEAT_2ND(BOOST_PP_INC(IS_FUNCTION_HELPER_TEST_MAX),IS_FUNCTION_HELPER,A)
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#undef IS_FUNCTION_HELPER
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