projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | <html> |
| 2 | <head> | |
| 3 | <title>BOOST_PP_INCLUDE_SELF</title> | |
| 4 | <link rel="stylesheet" type="text/css" href="../styles.css"> | |
| 5 | </head> | |
| 6 | <body> | |
| 7 | <div style="margin-left: 0px;"> | |
| 8 | The <b>BOOST_PP_INCLUDE_SELF</b> macro includes a file indirectly. | |
| 9 | </div> | |
| 10 | <h4>Usage</h4> | |
| 11 | <div class="code"> | |
| 12 | #include <b>BOOST_PP_INCLUDE_SELF</b>() | |
| 13 | </div> | |
| 14 | <h4>Arguments</h4> | |
| 15 | <dl> | |
| 16 | <dt>filename</dt> | |
| 17 | <dd> | |
| 18 | A quoted or angle-bracketed filename to be included by <b>BOOST_PP_INCLUDE_SELF</b>. | |
| 19 | </dd> | |
| 20 | </dl> | |
| 21 | <h4>Remarks</h4> | |
| 22 | <div> | |
| 23 | <b>BOOST_PP_INDIRECT_SELF</b> must be defined prior to using this macro. | |
| 24 | </div> | |
| 25 | <div> | |
| 26 | Most preprocessors will not allow a file to directly include itself--even when the file protects itself from such a scenario. | |
| 27 | This macro, in combination with <b>BOOST_PP_INDIRECT_SELF</b> allows a file to include itself indirectly. | |
| 28 | </div> | |
| 29 | <div> | |
| 30 | While <b>BOOST_PP_INDIRECT_SELF</b> is being included, <b>BOOST_PP_INCLUDE_SELF</b> defines the macro <b>BOOST_PP_IS_SELFISH</b> to <i>1</i>. | |
| 31 | When it returns from the inclusion, <b>BOOST_PP_IS_SELFISH</b> is undefined. | |
| 32 | </div> | |
| 33 | <h4>See Also</h4> | |
| 34 | <ul> | |
| 35 | <li><a href="indirect_self.html">BOOST_PP_INDIRECT_SELF</a></li> | |
| 36 | <li><a href="is_selfish.html">BOOST_PP_IS_SELFISH</a></li> | |
| 37 | </ul> | |
| 38 | <h4>Requirements</h4> | |
| 39 | <div> | |
| 40 | <b>Header:</b> <a href="../headers/iteration/self.html"><boost/preprocessor/iteration/self.hpp></a> | |
| 41 | </div> | |
| 42 | <h4>Sample Code</h4> | |
| 43 | <div><pre> | |
| 44 | // file.h | |
| 45 | #if !<a href="is_selfish.html">BOOST_PP_IS_SELFISH</a> | |
| 46 | ||
| 47 | #ifndef FILE_H_ | |
| 48 | #define FILE_H_ | |
| 49 | ||
| 50 | #include <<a href="../headers/iteration/self.html">boost/preprocessor/iteration/self.hpp</a>> | |
| 51 | ||
| 52 | #define NAME X | |
| 53 | struct NAME { | |
| 54 | // ... | |
| 55 | #define <a href="indirect_self.html">BOOST_PP_INDIRECT_SELF</a> "file.h" | |
| 56 | #include <a href="include_self.html">BOOST_PP_INCLUDE_SELF</a>() | |
| 57 | }; | |
| 58 | ||
| 59 | #define NAME Y | |
| 60 | struct NAME { | |
| 61 | // ... | |
| 62 | #define <a href="indirect_self.html">BOOST_PP_INDIRECT_SELF</a> "file.h" | |
| 63 | #include <a href="include_self.html">BOOST_PP_INCLUDE_SELF</a>() | |
| 64 | }; | |
| 65 | ||
| 66 | #define NAME Z | |
| 67 | struct NAME { | |
| 68 | // ... | |
| 69 | #define <a href="indirect_self.html">BOOST_PP_INDIRECT_SELF</a> "file.h" | |
| 70 | #include <a href="include_self.html">BOOST_PP_INCLUDE_SELF</a>() | |
| 71 | }; | |
| 72 | ||
| 73 | #endif | |
| 74 | ||
| 75 | #else | |
| 76 | ||
| 77 | inline bool validate(NAME* p) { | |
| 78 | return true; | |
| 79 | } | |
| 80 | ||
| 81 | template<class T> bool validate(T* p) { | |
| 82 | return dynamic_cast<NAME*>(p); | |
| 83 | } | |
| 84 | ||
| 85 | #undef NAME | |
| 86 | ||
| 87 | #endif | |
| 88 | </pre></div> | |
| 89 | <hr size="1"> | |
| 90 | <div style="margin-left: 0px;"> | |
| 91 |