Enum AdviceMode 

pub enum AdviceMode {
    Normal,
    Sequential,
    Random,
    WillNeed,
    DontNeed,
    NoReuse,
}

A file access or cache-management hint. Advice does not change the file’s contents, size, or cursor, and the operating system may ignore it.

Variants

Normal

Restore the default access policy.

Sequential

Expect sequential access; the OS may increase readahead.

Random

Expect random access; the OS may disable readahead.

WillNeed

Hint that the range will be accessed soon. Completion does not guarantee that it is resident in memory.

DontNeed

Hint that cached pages in the range are no longer needed. This does not guarantee eviction or write dirty pages durably; partial pages may be ignored.

NoReuse

Hint that the range is unlikely to be reused. The effect depends on the OS and kernel version.

Trait Implementations

impl Clone for AdviceMode

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 AdviceMode

impl Debug for AdviceMode

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

Formats the value using the given formatter.

impl Default for AdviceMode

fn default() -> Self

Returns the “default value” for a type.

impl Eq for AdviceMode

impl PartialEq for AdviceMode

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for AdviceMode