86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
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/*!
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@file
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Forward declares `boost::hana::remove_range` and `boost::hana::remove_range_c`.
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@copyright Louis Dionne 2013-2016
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_FWD_REMOVE_RANGE_HPP
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#define BOOST_HANA_FWD_REMOVE_RANGE_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/when.hpp>
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#include <cstddef>
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BOOST_HANA_NAMESPACE_BEGIN
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//! Remove the elements inside a given range of indices from a sequence.
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//! @ingroup group-Sequence
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//!
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//! `remove_range` returns a new sequence identical to the original,
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//! except that elements at indices in the provided range are removed.
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//! Specifically, `remove_range([x0, ..., xn], from, to)` is a new
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//! sequence equivalent to `[x0, ..., x_from-1, x_to, ..., xn]`.
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//!
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//!
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//! @note
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//! The behavior is undefined if the range contains any index out of the
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//! bounds of the sequence.
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//!
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//!
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//! @param xs
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//! A sequence from which elements are removed.
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//!
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//! @param [from, to)
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//! An half-open interval of `IntegralConstant`s representing the indices
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//! of the elements to be removed from the sequence. The `IntegralConstant`s
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//! in the half-open interval must be non-negative and in the bounds of
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//! the sequence. The half-open interval must also be valid, meaning that
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//! `from <= to`.
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//!
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//!
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//! Example
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//! -------
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//! @include example/remove_range.cpp
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#ifdef BOOST_HANA_DOXYGEN_INVOKED
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constexpr auto remove_range = [](auto&& xs, auto const& from, auto const& to) {
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return tag-dispatched;
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};
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#else
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template <typename S, typename = void>
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struct remove_range_impl : remove_range_impl<S, when<true>> { };
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struct remove_range_t {
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template <typename Xs, typename From, typename To>
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constexpr auto operator()(Xs&& xs, From const& from, To const& to) const;
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};
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constexpr remove_range_t remove_range{};
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#endif
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//! Equivalent to `remove_range`; provided for convenience.
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//! @ingroup group-Sequence
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//!
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//!
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//! Example
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//! -------
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//! @include example/remove_range_c.cpp
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#ifdef BOOST_HANA_DOXYGEN_INVOKED
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template <std::size_t from, std::size_t to>
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constexpr auto remove_range_c = [](auto&& xs) {
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return hana::remove_range(forwarded(xs), hana::size_c<from>, hana::size_c<to>);
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};
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#else
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template <std::size_t from, std::size_t to>
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struct remove_range_c_t;
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template <std::size_t from, std::size_t to>
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constexpr remove_range_c_t<from, to> remove_range_c{};
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#endif
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_FWD_REMOVE_RANGE_HPP
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