openPMD-api
VariantSrc.hpp
1 /* Copyright 2002-2021 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 #if __cplusplus >= 201703L
24 # include <variant> // IWYU pragma: export
25 namespace variantSrc = std;
26 #else
27  // see: https://github.com/mpark/variant/pull/76
28 # if defined(__EXCEPTIONS)
29 # define MPARK_EXCEPTIONS
30 # endif
31 # include <mpark/variant.hpp> // IWYU pragma: export
32 namespace variantSrc = mpark;
33 #endif
STL namespace.