1 | |
2 | // Copyright (C) 2006-2009, 2012 Alexander Nasonov |
3 | // Copyright (C) 2012 Lorenzo Caminiti |
4 | // Distributed under the Boost Software License, Version 1.0 |
5 | // (see accompanying file LICENSE_1_0.txt or a copy at |
6 | // http://www.boost.org/LICENSE_1_0.txt) |
7 | // Home at http://www.boost.org/libs/scope_exit |
8 | |
9 | #include <boost/config.hpp> |
10 | #ifdef BOOST_NO_CXX11_VARIADIC_MACROS |
11 | # error "variadic macros required" |
12 | #else |
13 | |
14 | #include <boost/scope_exit.hpp> |
15 | #include <boost/preprocessor/cat.hpp> |
16 | #include <boost/detail/lightweight_test.hpp> |
17 | |
18 | //[same_line |
19 | #define SCOPE_EXIT_INC_DEC(variable, offset) \ |
20 | BOOST_SCOPE_EXIT_ID(BOOST_PP_CAT(inc, __LINE__), /* unique ID */ \ |
21 | &variable, offset) { \ |
22 | variable += offset; \ |
23 | } BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(inc, __LINE__)) \ |
24 | \ |
25 | BOOST_SCOPE_EXIT_ID(BOOST_PP_CAT(dec, __LINE__), \ |
26 | &variable, offset) { \ |
27 | variable -= offset; \ |
28 | } BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(dec, __LINE__)) |
29 | |
30 | #define SCOPE_EXIT_INC_DEC_TPL(variable, offset) \ |
31 | BOOST_SCOPE_EXIT_ID_TPL(BOOST_PP_CAT(inc, __LINE__), \ |
32 | &variable, offset) { \ |
33 | variable += offset; \ |
34 | } BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(inc, __LINE__)) \ |
35 | \ |
36 | BOOST_SCOPE_EXIT_ID_TPL(BOOST_PP_CAT(dec, __LINE__), \ |
37 | &variable, offset) { \ |
38 | variable -= offset; \ |
39 | } BOOST_SCOPE_EXIT_END_ID(BOOST_PP_CAT(dec, __LINE__)) |
40 | |
41 | #define SCOPE_EXIT_ALL_INC_DEC(variable, offset) \ |
42 | BOOST_SCOPE_EXIT_ALL_ID(BOOST_PP_CAT(inc, __LINE__), \ |
43 | =, &variable) { \ |
44 | variable += offset; \ |
45 | }; \ |
46 | BOOST_SCOPE_EXIT_ALL_ID(BOOST_PP_CAT(dec, __LINE__), \ |
47 | =, &variable) { \ |
48 | variable -= offset; \ |
49 | }; |
50 | |
51 | template<typename T> |
52 | void f(T& x, T& delta) { |
53 | SCOPE_EXIT_INC_DEC_TPL(x, delta) // Multiple scope exits on same line. |
54 | BOOST_TEST(x == 0); |
55 | } |
56 | |
57 | int main(void) { |
58 | int x = 0, delta = 10; |
59 | |
60 | { |
61 | SCOPE_EXIT_INC_DEC(x, delta) // Multiple scope exits on same line. |
62 | } |
63 | BOOST_TEST(x == 0); |
64 | |
65 | f(x, delta); |
66 | |
67 | #ifndef BOOST_NO_CXX11_LAMBDAS |
68 | { |
69 | SCOPE_EXIT_ALL_INC_DEC(x, delta) // Multiple scope exits on same line. |
70 | } |
71 | BOOST_TEST(x == 0); |
72 | #endif // LAMBDAS |
73 | |
74 | return boost::report_errors(); |
75 | } |
76 | //] |
77 | |
78 | #endif // variadic macros |
79 | |
80 | |