geometry/util/condition.hpp

0001 // Boost.Geometry
0002
0003 // Copyright (c) 2015 Oracle and/or its affiliates.
0004
0005 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
0006
0007 // Use, modification and distribution is subject to the Boost Software License,
0008 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010
0011 #ifndef BOOST_GEOMETRY_UTIL_CONDITION_HPP
0012 #define BOOST_GEOMETRY_UTIL_CONDITION_HPP
0013
0014
0015 #include <boost/config.hpp>
0016
0017
0018 // The macro defined in this file allows to suppress the MSVC
0019 // compiler warning C4127: conditional expression is constant
0020
0021 #ifdef BOOST_MSVC
0022
0023 // NOTE: The code commented out below contains an alternative implementation
0024 // of a macro using a free function. It was left here in case if in the future
0025 // version of MSVC for the code currently used in the macro implementation
0026 // the warning was generated.
0027
0028 //#ifndef DOXYGEN_NO_DETAIL
0029 //namespace boost { namespace geometry { namespace detail {
0030 //BOOST_FORCEINLINE bool condition(bool const b) { return b; }
0031 //}}} // boost::geometry::detail
0032 //#endif // DOXYGEN_NO_DETAIL
0033 //#define BOOST_GEOMETRY_CONDITION(CONDITION) boost::geometry::detail::condition(CONDITION)
0034
0035 #define BOOST_GEOMETRY_CONDITION(CONDITION) ((void)0, (CONDITION))
0036
0037 #else
0038
0039 #define BOOST_GEOMETRY_CONDITION(CONDITION) (CONDITION)
0040
0041 #endif
0042
0043
0044 #endif // BOOST_GEOMETRY_UTIL_CONDITION_HPP