| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef TYPECHECK_H_INCLUDED |
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| 3 | #define TYPECHECK_H_INCLUDED |
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| 4 | |
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| 5 | /* |
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| 6 | * Check at compile time that something is of a particular type. |
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| 7 | * Always evaluates to 1 so you may use it easily in comparisons. |
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| 8 | */ |
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| 9 | #define typecheck(type,x) \ |
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| 10 | ({ type __dummy; \ |
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| 11 | typeof(x) __dummy2; \ |
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| 12 | (void)(&__dummy == &__dummy2); \ |
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| 13 | 1; \ |
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| 14 | }) |
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| 15 | |
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| 16 | /* |
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| 17 | * Check at compile time that 'function' is a certain type, or is a pointer |
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| 18 | * to that type (needs to use typedef for the function type.) |
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| 19 | */ |
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| 20 | #define typecheck_fn(type,function) \ |
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| 21 | ({ typeof(type) __tmp = function; \ |
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| 22 | (void)__tmp; \ |
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| 23 | }) |
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| 24 | |
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| 25 | /* |
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| 26 | * Check at compile time that something is a pointer type. |
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| 27 | */ |
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| 28 | #define typecheck_pointer(x) \ |
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| 29 | ({ typeof(x) __dummy; \ |
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| 30 | (void)sizeof(*__dummy); \ |
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| 31 | 1; \ |
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| 32 | }) |
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| 33 | |
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| 34 | #endif /* TYPECHECK_H_INCLUDED */ |
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| 35 | |
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