Enum FileAccessMode 

#[non_exhaustive]
pub enum FileAccessMode {
    Read,
    Write,
    WriteTruncate,
    WriteAppend,
    ReadWrite,
    ReadWriteTruncate,
}

Access mode

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.

Read

Opens the file in read-only mode.

FileDescriptor mode: “r”

Write

👎Deprecated: This may or may not truncate existing contents. If the new file is smaller than the old one, this may cause the file to become corrupted.

Opens the file in write-only mode.

Since Android 10, this may or may not truncate existing contents. If the new file is smaller than the old one, this may cause the file to become corrupted. https://issuetracker.google.com/issues/180526528

The reason this is marked as deprecated is because of that behavior, and it is not scheduled to be removed in the future.

FileDescriptor mode: “w”

WriteTruncate

Opens the file in write-only mode. The existing content is truncated (deleted), and new data is written from the beginning.

FileDescriptor mode: “wt”

WriteAppend

Opens the file in write-only mode. The existing content is preserved, and new data is appended to the end of the file.

FileDescriptor mode: “wa”

ReadWrite

Opens the file in read-write mode.

FileDescriptor mode: “rw”

ReadWriteTruncate

Opens the file in read-write mode. The existing content is truncated (deleted), and new data is written from the beginning.

FileDescriptor mode: “rwt”

Trait Implementations

impl Clone for FileAccessMode

fn clone(&self) -> FileAccessMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FileAccessMode

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for FileAccessMode

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for FileAccessMode

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 FileAccessMode

fn eq(&self, other: &FileAccessMode) -> 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 Serialize for FileAccessMode

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for FileAccessMode

impl Eq for FileAccessMode

impl StructuralPartialEq for FileAccessMode