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Diff: platform/mbed_assert.h
- Revision:
- 151:5eaa88a5bcc7
- Parent:
- 149:156823d33999
diff -r 02e0a0aed4ec -r 5eaa88a5bcc7 platform/mbed_assert.h --- a/platform/mbed_assert.h Tue Nov 08 17:45:16 2016 +0000 +++ b/platform/mbed_assert.h Thu Nov 24 17:03:03 2016 +0000 @@ -19,6 +19,8 @@ #ifndef MBED_ASSERT_H #define MBED_ASSERT_H +#include "mbed_preprocessor.h" + #ifdef __cplusplus extern "C" { #endif @@ -49,6 +51,63 @@ } while (0) #endif + +/** MBED_STATIC_ASSERT + * Declare compile-time assertions, results in compile-time error if condition is false + * + * The assertion acts as a declaration that can be placed at file scope, in a + * code block (except after a label), or as a member of a C++ class/struct/union. + * + * @note + * Use of MBED_STATIC_ASSERT as a member of a struct/union is limited: + * - In C++, MBED_STATIC_ASSERT is valid in class/struct/union scope. + * - In C, MBED_STATIC_ASSERT is not valid in struct/union scope, and + * MBED_STRUCT_STATIC_ASSERT is provided as an alternative that is valid + * in C and C++ class/struct/union scope. + * + * @code + * MBED_STATIC_ASSERT(MBED_LIBRARY_VERSION >= 120, + * "The mbed library must be at least version 120"); + * + * int main() { + * MBED_STATIC_ASSERT(sizeof(int) >= sizeof(char), + * "An int must be larger than a char"); + * } + * @endcode + */ +#if defined(__cplusplus) && (__cplusplus >= 201103L || __cpp_static_assert >= 200410L) +#define MBED_STATIC_ASSERT(expr, msg) static_assert(expr, msg) +#elif !defined(__cplusplus) && __STDC_VERSION__ >= 201112L +#define MBED_STATIC_ASSERT(expr, msg) _Static_assert(expr, msg) +#elif defined(__cplusplus) && defined(__GNUC__) && defined(__GXX_EXPERIMENTAL_CXX0X__) \ + && (__GNUC__*100 + __GNUC_MINOR__) > 403L +#define MBED_STATIC_ASSERT(expr, msg) __extension__ static_assert(expr, msg) +#elif !defined(__cplusplus) && defined(__GNUC__) && !defined(__CC_ARM) \ + && (__GNUC__*100 + __GNUC_MINOR__) > 406L +#define MBED_STATIC_ASSERT(expr, msg) __extension__ _Static_assert(expr, msg) +#elif defined(__ICCARM__) +#define MBED_STATIC_ASSERT(expr, msg) static_assert(expr, msg) +#else +#define MBED_STATIC_ASSERT(expr, msg) \ + enum {MBED_CONCAT(MBED_ASSERTION_AT_, __LINE__) = sizeof(char[(expr) ? 1 : -1])} +#endif + +/** MBED_STRUCT_STATIC_ASSERT + * Declare compile-time assertions, results in compile-time error if condition is false + * + * Unlike MBED_STATIC_ASSERT, MBED_STRUCT_STATIC_ASSERT can and must be used + * as a member of a C/C++ class/struct/union. + * + * @code + * struct thing { + * MBED_STATIC_ASSERT(2 + 2 == 4, + * "Hopefully the universe is mathematically consistent"); + * }; + * @endcode + */ +#define MBED_STRUCT_STATIC_ASSERT(expr, msg) int : (expr) ? 0 : -1 + + #endif /** @}*/