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a76422df | 1 | // { dg-require-atomic-builtins "" } |
8868286e | 2 | // { dg-options "-std=gnu++11" } |
520da0e4 | 3 | |
f1717362 | 4 | // Copyright (C) 2012-2016 Free Software Foundation, Inc. |
520da0e4 | 5 | // |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
9 | // Free Software Foundation; either version 3, or (at your option) | |
10 | // any later version. | |
11 | ||
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | ||
17 | // You should have received a copy of the GNU General Public License along | |
18 | // with this library; see the file COPYING3. If not see | |
19 | // <http://www.gnu.org/licenses/>. | |
20 | ||
21 | #include <atomic> | |
22 | #include <cstdlib> //std::abs | |
23 | #include <testsuite_hooks.h> | |
24 | ||
25 | // pointer arithimetic vs. atomic<void*>. | |
26 | // atomic<void*> vs. explicitly specialized w/o operators, like atomic_bool? | |
27 | int main(void) | |
28 | { | |
520da0e4 | 29 | using namespace std; |
30 | ||
31 | typedef int value_type; | |
32 | const size_t n = 2; | |
33 | value_type value = 42; | |
34 | value_type* p = &value; | |
35 | void* vp = p; | |
664ecbbe | 36 | ptrdiff_t __attribute__((unused)) dist(0); |
520da0e4 | 37 | |
38 | atomic<void*> a(vp); | |
39 | ||
40 | // operator++ | |
41 | void* vp2(a); | |
42 | a++; | |
43 | void* vp3(a); | |
44 | dist = reinterpret_cast<char*>(vp2) - reinterpret_cast<char*>(vp3); | |
9cd65e05 | 45 | VERIFY ( std::abs(dist) == 1 ); |
520da0e4 | 46 | |
47 | // operator-- | |
48 | void* vp4(a); | |
49 | a--; | |
50 | void* vp5(a); | |
51 | dist = reinterpret_cast<char*>(vp4) - reinterpret_cast<char*>(vp5); | |
9cd65e05 | 52 | VERIFY ( std::abs(dist) == 1 ); |
520da0e4 | 53 | |
54 | // operator+= | |
55 | void* vp6(a); | |
56 | a+=n; | |
57 | void* vp7(a); | |
58 | dist = reinterpret_cast<char*>(vp6) - reinterpret_cast<char*>(vp7); | |
9cd65e05 | 59 | VERIFY ( std::abs(dist) == n ); |
520da0e4 | 60 | |
61 | // operator-= | |
62 | void* vp8(a); | |
63 | a-=n; | |
64 | void* vp9(a); | |
65 | dist = reinterpret_cast<char*>(vp8) - reinterpret_cast<char*>(vp9); | |
9cd65e05 | 66 | VERIFY ( std::abs(dist) == n ); |
520da0e4 | 67 | |
68 | return 0; | |
69 | } |