cev 0.1.0

An expandable data array used to add data to the beginning of the array.
Documentation 
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use std::alloc::{Layout, LayoutError};
use std::error::Error;
use std::fmt::{self, Display};

#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub struct AllocError;

impl Error for AllocError {}

impl fmt::Display for AllocError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str("memory allocation failed")
    }
}

#[derive(Clone, PartialEq, Eq, Debug)]
pub struct TryReserveError {
    kind: TryReserveErrorKind,
}

impl TryReserveError {
    pub fn kind(&self) -> TryReserveErrorKind {
        self.kind.clone()
    }
}

#[derive(Clone, PartialEq, Eq, Debug)]
pub enum TryReserveErrorKind {
    CapacityOverflow,
    AllocError { layout: Layout, non_exhaustive: () },
}

impl From<TryReserveErrorKind> for TryReserveError {
    #[inline]
    fn from(kind: TryReserveErrorKind) -> Self {
        Self { kind }
    }
}

impl From<LayoutError> for TryReserveErrorKind {
    #[inline]
    fn from(_: LayoutError) -> Self {
        TryReserveErrorKind::CapacityOverflow
    }
}

impl Display for TryReserveError {
    fn fmt(
        &self,
        fmt: &mut core::fmt::Formatter<'_>,
    ) -> core::result::Result<(), core::fmt::Error> {
        fmt.write_str("memory allocation failed")?;
        let reason = match self.kind {
            TryReserveErrorKind::CapacityOverflow => {
                " because the computed capacity exceeded the collection's maximum"
            }
            TryReserveErrorKind::AllocError { .. } => {
                " because the memory allocator returned an error"
            }
        };
        fmt.write_str(reason)
    }
}

impl std::error::Error for TryReserveError {}