1/*!
2@file
3Forward declares `boost::hana::accessors`.
4
5Copyright Louis Dionne 2013-2022
6Distributed under the Boost Software License, Version 1.0.
7(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
8 */
9
10#ifndef BOOST_HANA_FWD_ACCESSORS_HPP
11#define BOOST_HANA_FWD_ACCESSORS_HPP
12
13#include <boost/hana/config.hpp>
14#include <boost/hana/core/when.hpp>
15
16
17namespace boost { namespace hana {
18 //! Returns a `Sequence` of pairs representing the accessors of the
19 //! data structure.
20 //! @ingroup group-Struct
21 //!
22 //! Given a `Struct` `S`, `accessors<S>()` is a `Sequence` of `Product`s
23 //! where the first element of each pair is the "name" of a member of
24 //! the `Struct`, and the second element of each pair is a function that
25 //! can be used to access that member when given an object of the proper
26 //! data type. As described in the global documentation for `Struct`, the
27 //! accessor functions in this sequence must be move-independent.
28 //!
29 //!
30 //! Example
31 //! -------
32 //! @include example/accessors.cpp
33#ifdef BOOST_HANA_DOXYGEN_INVOKED
34 template <typename S>
35 constexpr auto accessors = []() {
36 return tag-dispatched;
37 };
38#else
39 template <typename S, typename = void>
40 struct accessors_impl : accessors_impl<S, when<true>> { };
41
42 template <typename S>
43 struct accessors_t;
44
45 template <typename S>
46 BOOST_HANA_INLINE_VARIABLE constexpr accessors_t<S> accessors{};
47#endif
48}} // end namespace boost::hana
49
50#endif // !BOOST_HANA_FWD_ACCESSORS_HPP
51

source code of boost/libs/hana/include/boost/hana/fwd/accessors.hpp