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