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 49
