66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*!
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@file
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Forward declares `boost::hana::basic_tuple`.
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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_BASIC_TUPLE_HPP
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#define BOOST_HANA_FWD_BASIC_TUPLE_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/fwd/core/make.hpp>
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BOOST_HANA_NAMESPACE_BEGIN
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//! @ingroup group-datatypes
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//! Stripped down version of `hana::tuple`.
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//!
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//! Whereas `hana::tuple` aims to provide an interface somewhat close to a
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//! `std::tuple`, `basic_tuple` provides the strict minimum required to
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//! implement a closure with maximum compile-time efficiency.
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//!
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//!
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//! Modeled concepts
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//! ----------------
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//! `Sequence`, and all the concepts it refines
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template <typename ...Xs>
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struct basic_tuple;
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//! Tag representing `hana::basic_tuple`.
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//! @relates hana::basic_tuple
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struct basic_tuple_tag { };
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#ifdef BOOST_HANA_DOXYGEN_INVOKED
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//! Function object for creating a `basic_tuple`.
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//! @relates hana::basic_tuple
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//!
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//! Given zero or more objects `xs...`, `make<basic_tuple_tag>` returns a
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//! new `basic_tuple` containing those objects. The elements are held by
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//! value inside the resulting tuple, and they are hence copied or moved
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//! in. This is analogous to `std::make_tuple` for creating `basic_tuple`s.
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//!
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//!
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//! Example
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//! -------
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//! @include example/basic_tuple/make.cpp
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template <>
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constexpr auto make<basic_tuple_tag> = [](auto&& ...xs) {
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return basic_tuple<std::decay_t<decltype(xs)>...>{forwarded(xs)...};
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};
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#endif
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//! Alias to `make<basic_tuple_tag>`; provided for convenience.
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//! @relates hana::basic_tuple
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//!
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//!
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//! Example
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//! -------
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//! @include example/basic_tuple/make.cpp
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constexpr auto make_basic_tuple = make<basic_tuple_tag>;
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_FWD_BASIC_TUPLE_HPP
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