1 | /* GLIB - Library of useful routines for C programming |
2 | * Copyright (C) 2021 Iain Lane, Xavier Claessens |
3 | * |
4 | * SPDX-License-Identifier: LGPL-2.1-or-later |
5 | * |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2.1 of the License, or (at your option) any later version. |
10 | * |
11 | * This library 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 GNU |
14 | * Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
18 | */ |
19 | |
20 | #ifndef __GLIB_TYPEOF_H__ |
21 | #define __GLIB_TYPEOF_H__ |
22 | |
23 | #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION) |
24 | #error "Only <glib.h> can be included directly." |
25 | #endif |
26 | |
27 | #include <glib/gversionmacros.h> |
28 | |
29 | /* |
30 | * We can only use __typeof__ on GCC >= 4.8, and not when compiling C++. Since |
31 | * __typeof__ is used in a few places in GLib, provide a pre-processor symbol |
32 | * to factor the check out from callers. |
33 | * |
34 | * This symbol is private. |
35 | */ |
36 | #undef glib_typeof |
37 | #if !G_CXX_STD_CHECK_VERSION (11) && \ |
38 | (G_GNUC_CHECK_VERSION(4, 8) || defined(__clang__)) |
39 | #define glib_typeof(t) __typeof__ (t) |
40 | #elif G_CXX_STD_CHECK_VERSION (11) && \ |
41 | GLIB_VERSION_MIN_REQUIRED >= GLIB_VERSION_2_68 |
42 | /* C++11 decltype() is close enough for our usage */ |
43 | #include <type_traits> |
44 | #define glib_typeof(t) typename std::remove_reference<decltype (t)>::type |
45 | #endif |
46 | |
47 | #endif /* __GLIB_TYPEOF_H__ */ |
48 | |