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annotate DEPENDENCIES/generic/include/boost/flyweight/detail/not_placeholder_expr.hpp @ 133:4acb5d8d80b6 tip

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Don't fail environmental check if README.md exists (but .txt and no-suffix don't)
author Chris Cannam
date Tue, 30 Jul 2019 12:25:44 +0100
parents c530137014c0
children
rev   line source
Chris@16 1 /* Copyright 2006-2008 Joaquin M Lopez Munoz.
Chris@16 2 * Distributed under the Boost Software License, Version 1.0.
Chris@16 3 * (See accompanying file LICENSE_1_0.txt or copy at
Chris@16 4 * http://www.boost.org/LICENSE_1_0.txt)
Chris@16 5 *
Chris@16 6 * See http://www.boost.org/libs/flyweight for library home page.
Chris@16 7 */
Chris@16 8
Chris@16 9 #ifndef BOOST_FLYWEIGHT_DETAIL_NOT_PLACEHOLDER_EXPR_HPP
Chris@16 10 #define BOOST_FLYWEIGHT_DETAIL_NOT_PLACEHOLDER_EXPR_HPP
Chris@16 11
Chris@101 12 #if defined(_MSC_VER)
Chris@16 13 #pragma once
Chris@16 14 #endif
Chris@16 15
Chris@16 16 /* BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION can be inserted at the end
Chris@16 17 * of a class template parameter declaration:
Chris@16 18 * template<
Chris@16 19 * typename X0,...,typename Xn
Chris@16 20 * BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION
Chris@16 21 * >
Chris@16 22 * struct foo...
Chris@16 23 * to prevent instantiations from being treated as MPL placeholder
Chris@16 24 * expressions in the presence of placeholder arguments; this is useful
Chris@16 25 * to avoid masking of a metafunction class nested ::apply during
Chris@16 26 * MPL invocation.
Chris@16 27 */
Chris@16 28
Chris@16 29 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
Chris@16 30 #include <boost/detail/workaround.hpp>
Chris@16 31
Chris@16 32 #if BOOST_WORKAROUND(__GNUC__, <4)||\
Chris@16 33 BOOST_WORKAROUND(__GNUC__,==4)&&(__GNUC_MINOR__<2)
Chris@16 34 /* The default trick on which the macro is based, namely adding a int=0
Chris@16 35 * defaulted template parameter, does not work in GCC prior to 4.2 due to
Chris@16 36 * an unfortunate compiler non-standard extension, as explained in
Chris@16 37 * http://lists.boost.org/boost-users/2007/07/29866.php
Chris@16 38 * We resort to an uglier technique, adding defaulted template parameters
Chris@16 39 * so as to exceed BOOST_MPL_LIMIT_METAFUNCTION_ARITY.
Chris@16 40 */
Chris@16 41
Chris@16 42 #include <boost/mpl/limits/arity.hpp>
Chris@16 43 #include <boost/preprocessor/facilities/intercept.hpp>
Chris@16 44 #include <boost/preprocessor/repetition/enum_trailing_params.hpp>
Chris@16 45
Chris@16 46 #define BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION \
Chris@16 47 BOOST_PP_ENUM_TRAILING_PARAMS( \
Chris@16 48 BOOST_MPL_LIMIT_METAFUNCTION_ARITY,typename=int BOOST_PP_INTERCEPT)
Chris@16 49 #define BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF \
Chris@16 50 BOOST_PP_ENUM_TRAILING_PARAMS( \
Chris@16 51 BOOST_MPL_LIMIT_METAFUNCTION_ARITY,typename BOOST_PP_INTERCEPT)
Chris@16 52
Chris@16 53 #else
Chris@16 54 #define BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION ,int=0
Chris@16 55 #define BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF ,int
Chris@16 56 #endif
Chris@16 57
Chris@16 58 #endif