Enum OpenMode 

pub enum OpenMode {
    Auto,
    ReadWrite,
    ReadOnly,
}

Controls how MmapDriver opens the backing file.

Variants

Auto

Auto-detect: existing files open as committed (read-only mmap), new files open as active (read-write mmap). Default behavior.

ReadWrite

Always read-write. Existing files are opened without truncation. Writes after commit transparently reopen the file as read-write. Use for files that are rewritten in place (e.g. index files).

ReadOnly

Always read-only. Existing files are committed; missing files are treated as empty committed resources. Writes are rejected.

Trait Implementations

impl Clone for OpenMode

fn clone(&self) -> OpenMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for OpenMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for OpenMode

fn default() -> OpenMode

Returns the “default value” for a type.

impl PartialEq for OpenMode

fn eq(&self, other: &OpenMode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for OpenMode

impl Eq for OpenMode

impl StructuralPartialEq for OpenMode