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#ifndef BOOST_CONTRACT_DETAIL_PP_KEYWORD_VIRTUAL_HPP_
#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_VIRTUAL_HPP_

// Copyright (C) 2008-2018 Lorenzo Caminiti
// Distributed under the Boost Software License, Version 1.0 (see accompanying
// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html

#include <boost/contract/detail/preprocessor/keyword/utility/is.hpp>
#include <boost/preprocessor/cat.hpp>

/* PRIVATE */

// Must expand to a single comma `,` (not local macros, do not #undefine).
#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_VIRTUAL_CAT_TO_COMMAvirtual ,

// Must expand to empty `` (not local macros, do not #undefine).
#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_VIRTUAL_CAT_TO_EMPTYvirtual

/* PUBLIC */

// Precondition: tokens must start with a token concatenable to a macro name
//               (e.g., a literal or integral token).
#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_IS_VIRTUAL(tokens) \
    BOOST_CONTRACT_DETAIL_PP_KEYWORD_UTILITY_IS( \
            BOOST_CONTRACT_DETAIL_PP_KEYWORD_VIRTUAL_CAT_TO_COMMA, tokens)

// Precondition: tokens must start with `virtual` (this can be
//               checked with `..._IS_VIRTUAL` macro above).
#define BOOST_CONTRACT_DETAIL_PP_KEYWORD_REMOVE_VIRTUAL(tokens) \
    BOOST_PP_CAT(BOOST_CONTRACT_DETAIL_PP_KEYWORD_VIRTUAL_CAT_TO_EMPTY, tokens)

#endif // #include guard