repeat_n.hpp

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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2021, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2021, Knut Reinert & MPI für molekulare Genetik
// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
// -----------------------------------------------------------------------------------------------------
 
#pragma once
 
#include <seqan3/std/concepts>
 
#include <seqan3/io/views/detail/take_exactly_view.hpp>
#include <seqan3/utility/views/repeat.hpp>
 
namespace seqan3::detail
{
 
struct repeat_n_fn
{
    template <typename value_t>
    constexpr auto operator()(value_t && value, size_t const count) const
    {
        static_assert(std::copy_constructible<value_t>, "The value passed to repeat_n must be copy constructible.");
 
        return views::repeat(std::forward<value_t>(value)) | detail::take_exactly(count);
    }
};
 
} // namespace seqan3::detail
 
namespace seqan3::views
{
constexpr inline auto repeat_n = detail::repeat_n_fn{};
 
} // namespace seqan3::views