The return type of size() in simd and simd_mask is specified to be std::size_t. This is for consistency with all other size() functions in the STL. However:
for (simd<int> i([](int n) { return n; }); all_of(i < N); i += simd<int>::size()) doesn't compile because size_t does not implicitly convert to simd<int>
the value of size() is supposed to be small, never getting even close to the amount of addressable memory
it's simd_abi::fixed_size<int> not simd_abi::fixed_size<size_t> for most of the reasons above, so a change to int would make it consistent
The return type of
size()insimdandsimd_maskis specified to bestd::size_t. This is for consistency with all othersize()functions in the STL. However:simdandsimd_maskare not containers, so this should be a non-goalfor (simd<int> i([](int n) { return n; }); all_of(i < N); i += simd<int>::size())doesn't compile becausesize_tdoes not implicitly convert tosimd<int>size()is supposed to be small, never getting even close to the amount of addressable memorysimd_abi::fixed_size<int>notsimd_abi::fixed_size<size_t>for most of the reasons above, so a change tointwould make it consistent