1 2 // (C) Copyright Edward Diener 2011-2015 3 // Use, modification and distribution are subject to the Boost Software License, 4 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 5 // http://www.boost.org/LICENSE_1_0.txt). 6 7 #if !defined(BOOST_VMD_ASSERT_HPP) 8 #define BOOST_VMD_ASSERT_HPP 9 10 #include <boost/vmd/detail/setup.hpp> 11 12 #if BOOST_PP_VARIADICS 13 14 #include <boost/vmd/detail/assert.hpp> 15 16 /* 17 18 The succeeding comments in this file are in doxygen format. 19 20 */ 21 22 /** \file 23 */ 24 25 /** \def BOOST_VMD_ASSERT(...) 26 27 \brief Conditionally causes an error to be generated. 28 29 ... = variadic parameters, maximum of 2 will be considered. 30 Any variadic parameters beyond the maximum of 2 are just ignored. 31 32 The first variadic parameter is: 33 34 cond = A condition that determines whether an assertion occurs. Valid values range from 0 to BOOST_PP_LIMIT_MAG. 35 36 The second variadic parameter (optional) is: 37 38 errstr = An error string for generating a compiler error when using the VC++ compiler. 39 The VC++ compiler is incapable of producing a preprocessor error so when the 'cond' 40 is 0, a compiler error is generated by outputting C++ code in the form of: 41 42 @code 43 44 typedef char errstr[-1]; 45 46 @endcode 47 48 The errstr defaults to BOOST_VMD_ASSERT_ERROR if not supplied. 49 It is only relevant for VC++. 50 51 returns = If cond expands to 0, this macro causes an error. Otherwise, it expands to nothing. 52 For all compilers other than Visual C++ the error is a preprocessing error. 53 For Visual C++ the error is caused by output invalid C++: this error could be 54 masked if the invalid output is ignored by a macro which invokes this macro. 55 56 */ 57 # define BOOST_VMD_ASSERT(...) \ 58 BOOST_VMD_DETAIL_ASSERT(__VA_ARGS__) \ 59 /**/ 60 61 #endif /* BOOST_PP_VARIADICS */ 62 #endif /* BOOST_VMD_ASSERT_HPP */ 63