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111
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1 // Definitions of helper macros for tests of flexible array members.
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2
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3 #if __cplusplus < 201102L
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4 # define _CAT(x, y) x ## y
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5 # define CAT(x, y) _CAT (x, y)
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6
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7 // Generate a struct with a unique name containing a bitfield
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8 // of size that must evaluate to a non-zero value, otherwise
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9 // generate a compiler error.
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10 # define ASSERT(expr) \
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11 struct CAT (FAM_Assert, __LINE__) { unsigned asrt: 0 != (expr); }
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12 #else
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13 // In C++ 11 and beyond, use static_assert.
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14 # define ASSERT(expr) static_assert (expr, #expr)
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15 #endif
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16
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17 // Macro to verify that a flexible array member is allocated
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18 // at the very end of the containing struct.
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19 #define ASSERT_AT_END(T, m) \
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20 ASSERT (__builtin_offsetof (T, m) == sizeof (T))
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21
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22 typedef __SIZE_TYPE__ size_t;
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