Lalalala doo
August 29th, 2024
What a silly name. But the place itself is not particularly silly: it’s the valley following the river from Stowmarket to Ipswich and made for a pleasant if uneventful Sunday afternoon walk.
August 2nd, 2024
Here’s a macro I came up with today using the C11 _Generic feature that I’m quite pleased with:
#define TYPE_MAX(x) \ _Generic((x), \ uint64_t: UINT64_MAX, \ int64_t: INT64_MAX, \ uint32_t: UINT32_MAX, \ int32_t: INT32_MAX, \ uint16_t: UINT16_MAX, \ int16_t: INT16_MAX, \ uint8_t: UINT8_MAX, \ int8_t: INT8_MAX) #define saturate_add(a, b) ({ \ typeof((a)) __tmp; \ if (__builtin_add_overflow((a), (b), &__tmp)) \ __tmp = TYPE_MAX(__tmp); \ __tmp; \ })
It does a saturating addition on any integer type taking into account that signed and unsigned types of the same size have different maximum values. For signed types it doesn’t handle the case where b is negative however.
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