Enum CopyMode 

#[non_exhaustive]
pub enum CopyMode {
    IfAbsent,
    Replace,
}

Whether COPY may overwrite an existing destination (crate::Store::copy).

use kevy_embedded::{Config, CopyMode, Store};

let s = Store::open(Config::default())?;
s.set(b"src", b"new")?;
s.set(b"dst", b"old")?;
assert!(!s.copy(b"src", b"dst", CopyMode::IfAbsent)?);
assert!(s.copy(b"src", b"dst", CopyMode::Replace)?);
assert_eq!(s.get(b"dst")?.as_deref(), Some(&b"new"[..]));

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

IfAbsent

Copy only when the destination does not exist (COPY without REPLACE).

use kevy_embedded::{Config, CopyMode, Store};

let s = Store::open(Config::default())?;
s.set(b"src", b"v")?;
assert!(s.copy(b"src", b"fresh", CopyMode::IfAbsent)?, "an absent destination is written");
s.set(b"taken", b"old")?;
assert!(!s.copy(b"src", b"taken", CopyMode::IfAbsent)?);
assert_eq!(s.get(b"taken")?.as_deref(), Some(&b"old"[..]));

Replace

Overwrite an existing destination (COPY … REPLACE).

use kevy_embedded::{Config, CopyMode, Store};

let s = Store::open(Config::default())?;
s.set(b"src", b"new")?;
s.set(b"dst", b"old")?;
assert!(s.copy(b"src", b"dst", CopyMode::Replace)?);
assert_eq!(s.get(b"dst")?.as_deref(), Some(&b"new"[..]));

Trait Implementations

impl Clone for CopyMode

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CopyMode

impl Debug for CopyMode

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

Formats the value using the given formatter.

impl Default for CopyMode

fn default() -> Self

Returns the “default value” for a type.

impl Eq for CopyMode

impl Hash for CopyMode

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for CopyMode

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CopyMode