Sha256: fff83dc39d30e75e8e611991f9c5399188a1aad23a6462dbca2c8b62655cfedb
Contents?: true
Size: 644 Bytes
Versions: 30
Compression:
Stored size: 644 Bytes
Contents
use crate::lib::*;
pub fn from_bounds<I>(iter: &I) -> Option<usize>
where
I: Iterator,
{
helper(iter.size_hint())
}
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn cautious<Element>(hint: Option<usize>) -> usize {
const MAX_PREALLOC_BYTES: usize = 1024 * 1024;
if mem::size_of::<Element>() == 0 {
0
} else {
cmp::min(
hint.unwrap_or(0),
MAX_PREALLOC_BYTES / mem::size_of::<Element>(),
)
}
}
fn helper(bounds: (usize, Option<usize>)) -> Option<usize> {
match bounds {
(lower, Some(upper)) if lower == upper => Some(upper),
_ => None,
}
}
Version data entries
30 entries across 30 versions & 1 rubygems