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