]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | |
2 | // (C) Copyright Edward Diener 2011-2015 | |
3 | // Use, modification and distribution are subject to the Boost Software License, | |
4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt). | |
6 | ||
7 | #if !defined(BOOST_VMD_ASSERT_IS_EMPTY_HPP) | |
8 | #define BOOST_VMD_ASSERT_IS_EMPTY_HPP | |
9 | ||
10 | #include <boost/vmd/detail/setup.hpp> | |
11 | ||
12 | #if BOOST_PP_VARIADICS | |
13 | ||
14 | #if BOOST_VMD_ASSERT_DATA | |
15 | ||
16 | #include <boost/vmd/assert.hpp> | |
17 | #include <boost/vmd/is_empty.hpp> | |
18 | ||
19 | #endif | |
20 | ||
21 | /* | |
22 | ||
23 | The succeeding comments in this file are in doxygen format. | |
24 | ||
25 | */ | |
26 | ||
27 | /** \file | |
28 | */ | |
29 | ||
30 | /** \def BOOST_VMD_ASSERT_IS_EMPTY(...) | |
31 | ||
32 | \brief Asserts that the input is empty. | |
33 | ||
34 | The macro checks to see if the input is empty or not. | |
35 | If it is not empty, it forces a compiler error. | |
36 | ||
37 | The macro is a variadic macro taking any input. | |
38 | For the VC++8 compiler (VS2005) the macro takes a single parameter of input to check and not variadic data. | |
39 | ||
40 | The macro normally checks for emptiness only in | |
41 | debug mode. However an end-user can force the macro | |
42 | to check or not check by defining the macro | |
43 | BOOST_VMD_ASSERT_DATA to 1 or 0 respectively. | |
44 | ||
45 | .... = variadic input, for VC++8 this must be a single parameter. | |
46 | ||
47 | returns = Normally the macro returns nothing. | |
48 | ||
49 | If the input is empty, nothing is output. | |
50 | ||
51 | For VC++, because there is no sure way of forcing | |
52 | a compiler error from within a macro without producing | |
53 | output, if the input is not empty the | |
54 | macro forces a compiler error by outputting invalid C++. | |
55 | ||
56 | For all other compilers a compiler error is forced | |
57 | without producing output if the input is not empty. | |
58 | ||
59 | It is recommended to append BOOST_PP_EMPTY() to whatever input | |
60 | is being tested in order to avoid possible warning messages | |
61 | from some compilers about no parameters being passed to the macro | |
62 | when the input is truly empty. | |
63 | ||
64 | */ | |
65 | ||
66 | #if BOOST_VMD_MSVC_V8 | |
67 | ||
68 | #if !BOOST_VMD_ASSERT_DATA | |
69 | ||
70 | #define BOOST_VMD_ASSERT_IS_EMPTY(input) | |
71 | ||
72 | #else | |
73 | ||
74 | #define BOOST_VMD_ASSERT_IS_EMPTY(input) \ | |
75 | BOOST_VMD_ASSERT \ | |
76 | ( \ | |
77 | BOOST_VMD_IS_EMPTY(input), \ | |
78 | BOOST_VMD_IS_EMPTY_ASSERT_ERROR \ | |
79 | ) \ | |
80 | /**/ | |
81 | ||
82 | #endif // !BOOST_VMD_ASSERT_DATA | |
83 | ||
84 | #else | |
85 | ||
86 | #if !BOOST_VMD_ASSERT_DATA | |
87 | ||
88 | #define BOOST_VMD_ASSERT_IS_EMPTY(...) | |
89 | ||
90 | #else | |
91 | ||
92 | #define BOOST_VMD_ASSERT_IS_EMPTY(...) \ | |
93 | BOOST_VMD_ASSERT \ | |
94 | ( \ | |
95 | BOOST_VMD_IS_EMPTY(__VA_ARGS__), \ | |
96 | BOOST_VMD_IS_EMPTY_ASSERT_ERROR \ | |
97 | ) \ | |
98 | /**/ | |
99 | ||
100 | #endif // !BOOST_VMD_ASSERT_DATA | |
101 | ||
102 | #endif /* BOOST_VMD_MSVC_V8 */ | |
103 | ||
104 | #endif /* BOOST_PP_VARIADICS */ | |
105 | #endif /* BOOST_VMD_ASSERT_IS_EMPTY_HPP */ |