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Introduce an offset_ptr function to avoid quirky C pointer arithmetic

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apio 2022-11-20 15:12:18 +01:00
parent cb88630d86
commit 3815f9aa9f
1 changed files with 8 additions and 1 deletions
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7
luna/Alignment.h
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@ -37,3 +37,10 @@ static_assert(get_blocks_from_size(40960, 4096) == 10);
static_assert(get_blocks_from_size(194, 64) == 4); static_assert(get_blocks_from_size(194, 64) == 4);
static_assert(get_blocks_from_size(2, 32) == 1); static_assert(get_blocks_from_size(2, 32) == 1);
static_assert(get_blocks_from_size(0, 256) == 0); static_assert(get_blocks_from_size(0, 256) == 0);
// Offset a pointer by exactly <offset> bytes, no matter the type. Useful to avoid the quirks that come from C pointer
// arithmetic.
template <typename T, typename Offset> constexpr T* offset_ptr(T* ptr, Offset offset)
{
return (T*)((char*)ptr + offset);
}