1 | /* GLIB - Library of useful routines for C programming |
2 | * Copyright (C) 2021 Iain Lane, Xavier Claessens |
3 | * |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public |
6 | * License as published by the Free Software Foundation; either |
7 | * version 2.1 of the License, or (at your option) any later version. |
8 | * |
9 | * This library is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
16 | */ |
17 | |
18 | #ifndef __GLIB_TYPEOF_H__ |
19 | #define __GLIB_TYPEOF_H__ |
20 | |
21 | #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION) |
22 | #error "Only <glib.h> can be included directly." |
23 | #endif |
24 | |
25 | #include <glib/gversionmacros.h> |
26 | |
27 | /* |
28 | * We can only use __typeof__ on GCC >= 4.8, and not when compiling C++. Since |
29 | * __typeof__ is used in a few places in GLib, provide a pre-processor symbol |
30 | * to factor the check out from callers. |
31 | * |
32 | * This symbol is private. |
33 | */ |
34 | #undef glib_typeof |
35 | #if !defined(__cplusplus) && (G_GNUC_CHECK_VERSION(4, 8) || defined(__clang__)) |
36 | #define glib_typeof(t) __typeof__ (t) |
37 | #elif defined(__cplusplus) && __cplusplus >= 201103L && GLIB_VERSION_MIN_REQUIRED >= GLIB_VERSION_2_68 |
38 | /* C++11 decltype() is close enough for our usage */ |
39 | #include <type_traits> |
40 | #define glib_typeof(t) typename std::remove_reference<decltype (t)>::type |
41 | #endif |
42 | |
43 | #endif /* __GLIB_TYPEOF_H__ */ |
44 | |