Correct, and that's why you `first<N>()` after, however the question is how effective the compiler is at eliminating this temporary in between. Claudio. On Fri, Dec 6, 2024 at 7:07 PM Peter Dimov via Boost <boost@lists.boost.org> wrote:
Claudio DeSouza wrote:
The compiler can still see the max value being passed in and your example block has a fixed extent. By using first<> you get another span of fixed extent.
block has a fixed extent, but block.subspan(i * 4) does not.
...
On 12/6/24 21:46, Claudio DeSouza via Boost wrote:
detail::read32le( block.subspan(i * 4).first<4>());
So you also get a sized span, and avoid checks.
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