SeqAn3 3.4.0-rc.1
The Modern C++ library for sequence analysis.
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customisation_point.hpp
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1// -----------------------------------------------------------------------------------------------------
2// Copyright (c) 2006-2023, Knut Reinert & Freie Universität Berlin
3// Copyright (c) 2016-2023, Knut Reinert & MPI für molekulare Genetik
4// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
5// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
6// -----------------------------------------------------------------------------------------------------
7
13#pragma once
14
16
17namespace seqan3::detail
18{
19
20// ============================================================================
21// priority_tag
22// ============================================================================
23
26template <size_t I>
27struct priority_tag
29 // Doxygen fail
30 : priority_tag<I - 1>
32{};
33
35template <>
36struct priority_tag<0>
37{};
38
39} // namespace seqan3::detail
40
41// ============================================================================
42// SEQAN3_CPO_OVERLOAD
43// ============================================================================
44#if SEQAN3_DOXYGEN_ONLY(1) 0
62# define SEQAN3_CPO_OVERLOAD_BODY(...) \
63 noexcept(auto) \
64 { \
65 return __VA_ARGS__; \
66 }
67#else // ^^^ (simplified) doxygen version / normal definition vvv
68# define SEQAN3_CPO_OVERLOAD_BODY(...) \
69 noexcept(noexcept(__VA_ARGS__))->decltype(__VA_ARGS__) \
70 { \
71 return __VA_ARGS__; \
72 } \
73 static_assert(true)
74#endif
75
107#define SEQAN3_CPO_OVERLOAD(...) cpo_overload(__VA_ARGS__) SEQAN3_CPO_OVERLOAD_BODY
108
109namespace seqan3::detail
110{
139template <typename derived_t, unsigned max_priority>
140struct customisation_point_object
141{
142private:
144 friend derived_t;
145
146 constexpr customisation_point_object() = default;
147 constexpr customisation_point_object(customisation_point_object &&) = default;
148 constexpr customisation_point_object(customisation_point_object const &) = default;
149 constexpr customisation_point_object & operator=(customisation_point_object &&) = default;
150 constexpr customisation_point_object & operator=(customisation_point_object const &) = default;
151
152public:
163 template <typename... args_t, typename derived_type = derived_t /*circumvent incomplete types*/>
164 constexpr auto operator()(args_t &&... args) const SEQAN3_CPO_OVERLOAD_BODY(
165 /*return*/ derived_type::cpo_overload(priority_tag<max_priority>{}, std::forward<args_t>(args)...) /*;*/
166 );
167};
168} // namespace seqan3::detail
#define SEQAN3_CPO_OVERLOAD_BODY(...)
A macro helper for SEQAN3_CPO_OVERLOAD.
Definition customisation_point.hpp:62
Provides platform and dependency checks.