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+
+// (C) Copyright Edward Diener 2011-2015
+// Use, modification and distribution are subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt).
+
+#if !defined(BOOST_VMD_ASSERT_IS_EMPTY_HPP)
+#define BOOST_VMD_ASSERT_IS_EMPTY_HPP
+
+#include <boost/vmd/detail/setup.hpp>
+
+#if BOOST_PP_VARIADICS
+
+#if BOOST_VMD_ASSERT_DATA
+
+#include <boost/vmd/assert.hpp>
+#include <boost/vmd/is_empty.hpp>
+
+#endif
+
+/*
+
+ The succeeding comments in this file are in doxygen format.
+
+*/
+
+/** \file
+*/
+
+/** \def BOOST_VMD_ASSERT_IS_EMPTY(...)
+
+ \brief Asserts that the input is empty.
+
+ The macro checks to see if the input is empty or not.
+ If it is not empty, it forces a compiler error.
+
+ The macro is a variadic macro taking any input.
+ For the VC++8 compiler (VS2005) the macro takes a single parameter of input to check and not variadic data.
+
+ The macro normally checks for emptiness only in
+ debug mode. However an end-user can force the macro
+ to check or not check by defining the macro
+ BOOST_VMD_ASSERT_DATA to 1 or 0 respectively.
+
+ .... = variadic input, for VC++8 this must be a single parameter.
+
+ returns = Normally the macro returns nothing.
+
+ If the input is empty, nothing is output.
+
+ For VC++, because there is no sure way of forcing
+ a compiler error from within a macro without producing
+ output, if the input is not empty the
+ macro forces a compiler error by outputting invalid C++.
+
+ For all other compilers a compiler error is forced
+ without producing output if the input is not empty.
+
+ It is recommended to append BOOST_PP_EMPTY() to whatever input
+ is being tested in order to avoid possible warning messages
+ from some compilers about no parameters being passed to the macro
+ when the input is truly empty.
+
+*/
+
+#if BOOST_VMD_MSVC_V8
+
+#if !BOOST_VMD_ASSERT_DATA
+
+#define BOOST_VMD_ASSERT_IS_EMPTY(input)
+
+#else
+
+#define BOOST_VMD_ASSERT_IS_EMPTY(input) \
+ BOOST_VMD_ASSERT \
+ ( \
+ BOOST_VMD_IS_EMPTY(input), \
+ BOOST_VMD_IS_EMPTY_ASSERT_ERROR \
+ ) \
+/**/
+
+#endif // !BOOST_VMD_ASSERT_DATA
+
+#else
+
+#if !BOOST_VMD_ASSERT_DATA
+
+#define BOOST_VMD_ASSERT_IS_EMPTY(...)
+
+#else
+
+#define BOOST_VMD_ASSERT_IS_EMPTY(...) \
+ BOOST_VMD_ASSERT \
+ ( \
+ BOOST_VMD_IS_EMPTY(__VA_ARGS__), \
+ BOOST_VMD_IS_EMPTY_ASSERT_ERROR \
+ ) \
+/**/
+
+#endif // !BOOST_VMD_ASSERT_DATA
+
+#endif /* BOOST_VMD_MSVC_V8 */
+
+#endif /* BOOST_PP_VARIADICS */
+#endif /* BOOST_VMD_ASSERT_IS_EMPTY_HPP */