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//! Miscellanous internal utilities
use crate::internal_prelude::*;
/// Quantity of memory used, measured in bytes.
///
/// Like `usize` but `Display`s in a more friendly and less precise way
#[derive(Debug, Clone, Copy, Hash, Default, Eq, PartialEq, Ord, PartialOrd)] //
#[derive(From, Into, Deref, DerefMut, Serialize, Deserialize)]
#[serde(transparent)]
pub(crate) struct Qty(pub(crate) usize);
impl Qty {
/// Maximum for the type
pub(crate) const MAX: Qty = Qty(usize::MAX);
/// Return the value as a plain number, a `usize`
///
/// Provided so call sites don't need to write an opaque `.0` everywhere,
/// even though that would be fine.
pub(crate) const fn as_usize(self) -> usize {
self.0
}
}
impl Display for Qty {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mb = self.0 as f32 / (1024. * 1024.);
write!(f, "{:.2}MiB", mb)
}
}
/// Convenience extension trait to provide `.take()`
///
/// Convenient way to provide `.take()` on some of our types.
pub(crate) trait DefaultExtTake: Default {
/// Returns `*self`, replacing it with the default value.
fn take(&mut self) -> Self {
mem::take(self)
}
}
#[cfg(test)]
mod test {
// @@ begin test lint list maintained by maint/add_warning @@
#![allow(clippy::bool_assert_comparison)]
#![allow(clippy::clone_on_copy)]
#![allow(clippy::dbg_macro)]
#![allow(clippy::mixed_attributes_style)]
#![allow(clippy::print_stderr)]
#![allow(clippy::print_stdout)]
#![allow(clippy::single_char_pattern)]
#![allow(clippy::unwrap_used)]
#![allow(clippy::unchecked_duration_subtraction)]
#![allow(clippy::useless_vec)]
#![allow(clippy::needless_pass_by_value)]
//! <!-- @@ end test lint list maintained by maint/add_warning @@ -->
use super::*;
#[test]
fn display_qty() {
let chk = |by, s| assert_eq!(Qty(by).to_string(), s);
chk(10 * 1024, "0.01MiB");
chk(1024 * 1024, "1.00MiB");
chk(1000 * 1024 * 1024, "1000.00MiB");
}
}
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