/*=============================================================================
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Copyright (c) 2016 Paul Fultz II
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unpack_sequence.hpp
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#ifndef BOOST_HOF_GUARD_UNPACK_SEQUENCE_HPP
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#define BOOST_HOF_GUARD_UNPACK_SEQUENCE_HPP
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/// unpack_sequence
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/// ===============
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///
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/// How to unpack a sequence can be defined by specializing `unpack_sequence`.
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/// By default, `std::tuple` is already specialized. To implement this, one
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/// needs to provide a static `apply` function which will unpack the sequence
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/// to the parameters of the function.
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///
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/// Synopsis
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/// --------
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///
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/// template<class Sequence, class=void>
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/// struct unpack_sequence;
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///
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/// Example
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/// -------
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///
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/// #include <boost/hof.hpp>
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/// #include <cassert>
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///
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/// struct my_sequence
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/// {
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/// int x;
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/// int y;
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/// };
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///
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/// namespace boost { namespace hof {
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/// template<>
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/// struct unpack_sequence<my_sequence>
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/// {
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/// template<class F, class Sequence>
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/// constexpr static auto apply(F&& f, Sequence&& s) BOOST_HOF_RETURNS
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/// (
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/// f(s.x, s.y)
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/// );
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/// };
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/// }} // namespace boost::hof
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///
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/// int main() {
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/// }
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///
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/// See Also
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/// --------
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///
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/// * [unpack](unpack)
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/// * [is_unpackable](is_unpackable)
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///
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#include <boost/hof/config.hpp>
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namespace boost { namespace hof {
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template<class Sequence, class=void>
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struct unpack_sequence
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{
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typedef void not_unpackable;
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};
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}} // namespace boost::hof
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#endif
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