openPMD-api
Variant.hpp
1 /* Copyright 2018-2021 Axel Huebl
2  *
3  * This file is part of openPMD-api.
4  *
5  * openPMD-api is free software: you can redistribute it and/or modify
6  * it under the terms of of either the GNU General Public License or
7  * the GNU Lesser General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * openPMD-api is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License and the GNU Lesser General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * and the GNU Lesser General Public License along with openPMD-api.
19  * If not, see <http://www.gnu.org/licenses/>.
20  */
21 #pragma once
22 
23 #include "openPMD/auxiliary/VariantSrc.hpp"
24 
25 #include <pybind11/pybind11.h>
26 #include <pybind11/stl.h>
27 
28 // std::variant pybind11 helper
29 // https://github.com/pybind/pybind11/pull/811
30 // https://pybind11.readthedocs.io/en/stable/advanced/cast/stl.html
31 // in C++17 mode already defined in <pybind11/stl.h>
32 #if openPMD_HAS_CXX17 == 0
33 namespace pybind11
34 {
35 namespace detail
36 {
37  template <typename... Ts>
38  struct type_caster<variantSrc::variant<Ts...> >
39  : variant_caster<variantSrc::variant<Ts...> >
40  {};
41 
42  template <>
43  struct visit_helper<variantSrc::variant>
44  {
45  template <typename... Args>
46  static auto call(Args &&...args)
47  -> decltype(variantSrc::visit(std::forward<Args>(args)...))
48  {
49  return variantSrc::visit(std::forward<Args>(args)...);
50  }
51  };
52 } // namespace detail
53 } // namespace pybind11
54 #endif
Definition: Variant.hpp:33
Definition: Container.cpp:50