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Editing: repeat.hpp

/*!
@file
Defines `boost::hana::repeat`.

@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
 */

#ifndef BOOST_HANA_REPEAT_HPP
#define BOOST_HANA_REPEAT_HPP

#include <boost/hana/fwd/repeat.hpp>

#include <boost/hana/concept/integral_constant.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>

#include <cstddef>
#include <utility>

BOOST_HANA_NAMESPACE_BEGIN
    template <typename I, bool condition>
    struct repeat_impl<I, when<condition>> : default_ {
        template <typename F, std::size_t ...i>
        static constexpr void repeat_helper(F&& f, std::index_sequence<i...>) {
            using Swallow = std::size_t[];
            (void)Swallow{0, ((void)f(), i)...};
        }

template <typename N, typename F>
        static constexpr auto apply(N const&, F&& f) {
            static_assert(N::value >= 0, "hana::repeat(n, f) requires 'n' to be non-negative");
            constexpr std::size_t n = N::value;
            repeat_helper(static_cast<F&&>(f), std::make_index_sequence<n>{});
        }
    };

//! @cond
    template <typename N, typename F>
    constexpr void repeat_t::operator()(N const& n, F&& f) const {
        using I = typename hana::tag_of<N>::type;
        using Repeat = BOOST_HANA_DISPATCH_IF(repeat_impl<I>,
            hana::IntegralConstant<I>::value
        );

#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::IntegralConstant<I>::value,
        "hana::repeat(n, f) requires 'n' to be an IntegralConstant");
    #endif

return Repeat::apply(n, static_cast<F&&>(f));
    }
    //! @endcond
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_REPEAT_HPP

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