| José Fonseca | bfb4db8 | 2014-12-11 22:14:14 +0000 | [diff] [blame] | 1 | /************************************************************************** |
| 2 | * |
| 3 | * Copyright 2014 VMware, Inc. |
| 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the "Software"), |
| 8 | * to deal in the Software without restriction, including without limitation |
| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
| 11 | * Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included |
| 14 | * in all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 17 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 22 | * OTHER DEALINGS IN THE SOFTWARE. |
| 23 | * |
| 24 | **************************************************************************/ |
| 25 | |
| 26 | |
| 27 | /* |
| 28 | * Including system's headers inside `extern "C" { ... }` is not safe, as system |
| 29 | * headers may have C++ code in them, and C++ code inside extern "C" |
| 30 | * leads to syntatically incorrect code. |
| 31 | * |
| 32 | * This is because putting code inside extern "C" won't make __cplusplus define |
| 33 | * go away, that is, the system header being included thinks is free to use C++ |
| 34 | * as it sees fits. |
| 35 | * |
| 36 | * Including non-system headers inside extern "C" is not safe either, because |
| 37 | * non-system headers end up including system headers, hence fall in the above |
| 38 | * case too. |
| 39 | * |
| 40 | * Conclusion, includes inside extern "C" is simply not portable. |
| 41 | * |
| 42 | * |
| 43 | * This header helps surface these issues. |
| 44 | */ |
| 45 | |
| 46 | #ifdef __cplusplus |
| 47 | template<class T> class _IncludeInsideExternCNotPortable; |
| 48 | #endif |