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Pre-processor common macro addition #5987

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Feb 1, 2018
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Pre-processor common macro addition #5987

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27 changes: 27 additions & 0 deletions platform/mbed_preprocessor.h
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,33 @@
#define MBED_STRINGIFY(a) MBED_STRINGIFY_(a)
#define MBED_STRINGIFY_(a) #a

/** MBED_STRLEN
* Reports string token length
*
* @note
* Expands tokens before calculating length
*
* @code
* // Get string length
* const int len = MBED_STRLEN("Get the length")
* @endcode
*/
#define MBED_STRLEN(a) MBED_STRLEN_(a)
#define MBED_STRLEN_(a) (sizeof(a) - 1)

/** MBED_COUNT_VA_ARGS(...)
* Reports number of tokens passed
*
* @note
* Token limit is 16
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What's the reason for this limit?

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No particular reason for 16, we can have higher but will need some limit for macro to work

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In current state, if arguments more then 16 are passed response will be 16 the max limit

*
* @code
* // Get number of arguments
* const int count = MBED_COUNT_VA_ARGS("Address 0x%x, Data[0] = %d Data[1] = %d", 0x20001234, 10, 20)
* @endcode
*/
#define MBED_COUNT_VA_ARGS(...) GET_NTH_ARG_(__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
#define GET_NTH_ARG_(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, N, ...) N

#endif

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