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