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