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// (C) Copyright Edward Diener 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_SEQ_PUSH_FRONT_HPP)
#define BOOST_VMD_SEQ_PUSH_FRONT_HPP
#include <boost/vmd/detail/setup.hpp>
#if BOOST_PP_VARIADICS
#include <boost/preprocessor/control/iif.hpp>
#include <boost/preprocessor/seq/push_front.hpp>
#include <boost/vmd/identity.hpp>
#include <boost/vmd/is_empty.hpp>
/*
The succeeding comments in this file are in doxygen format.
*/
/** \file
*/
/** \def BOOST_VMD_SEQ_PUSH_FRONT(seq,elem)
\brief inserts an element at the beginning of a seq.
seq = seq to insert an element at.
elem = element to insert.
If the seq is an empty seq the result is a seq with the single element.
Otherwise the result is a seq after inserting the element at the beginning.
*/
#define BOOST_VMD_SEQ_PUSH_FRONT(seq,elem) \
BOOST_VMD_IDENTITY_RESULT \
( \
BOOST_PP_IIF \
( \
BOOST_VMD_IS_EMPTY(seq), \
BOOST_VMD_IDENTITY((elem)), \
BOOST_PP_SEQ_PUSH_FRONT \
) \
(seq,elem) \
) \
/**/
#endif /* BOOST_PP_VARIADICS */
#endif /* BOOST_VMD_SEQ_PUSH_FRONT_HPP */
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