Trait Octal

pub trait Octal {
    // Required method
    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> ;
}

core o formatting.

Re-exported from core::fmt:: .

---

o formatting.

The Octal trait should format its output as a number in base-8.

For primitive signed integers (i8 to i128, and isize), negative values are formatted as the two’s complement representation.

The alternate flag, #, adds a 0o in front of the output.

For more information on formatters, see the module-level documentation.

Examples

Basic usage with i32:

let x = 42; // 42 is '52' in octal

assert_eq!(format!("{x:o}"), "52");
assert_eq!(format!("{x:#o}"), "0o52");

assert_eq!(format!("{:o}", -16), "37777777760");

Implementing Octal on a type:

use std::fmt;

struct Length(i32);

impl fmt::Octal for Length {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let val = self.0;

        fmt::Octal::fmt(&val, f) // delegate to i32's implementation
    }
}

let l = Length(9);

assert_eq!(format!("l as octal is: {l:o}"), "l as octal is: 11");

assert_eq!(format!("l as octal is: {l:#06o}"), "l as octal is: 0o0011");

Required Methods

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

Formats the value using the given formatter.

Errors

This function should return Err if, and only if, the provided Formatter returns Err. String formatting is considered an infallible operation; this function only returns a Result because writing to the underlying stream might fail and it must provide a way to propagate the fact that an error has occurred back up the stack.

Implementors

impl Octal for i8

impl Octal for i16

impl Octal for i32

impl Octal for i64

impl Octal for i128

impl Octal for isize

impl Octal for u8

impl Octal for u16

impl Octal for u32

impl Octal for u64

impl Octal for u128

impl Octal for usize

impl Octal for KeyEventState

impl Octal for KeyModifiers

impl Octal for KeyboardEnhancementFlags

impl Octal for FileAccess

impl Octal for Root

impl Octal for FileChooserType

impl Octal for FileDialogOptions

impl Octal for LineStyle

impl Octal for Align

impl Octal for CallbackTrigger

impl Octal for Damage

impl Octal for devela::_dep::fltk::enums::Mode

impl Octal for Shortcut

impl Octal for GridAlign

impl Octal for AnimGifImageFlags

impl Octal for MenuFlag

impl Octal for Attrib

impl Octal for CharFlags

impl Octal for OutFlags

impl Octal for BigInt

impl Octal for devela::_dep::rustix::event::epoll::CreateFlags

impl Octal for EventfdFlags

impl Octal for PollFlags

impl Octal for devela::_dep::rustix::fs::inotify::CreateFlags

impl Octal for ReadFlags

impl Octal for WatchFlags

impl Octal for Access

impl Octal for AtFlags

impl Octal for FallocateFlags

impl Octal for FdFlags

impl Octal for IFlags

impl Octal for MemfdFlags

impl Octal for devela::_dep::rustix::fs::Mode

impl Octal for MountFlags

impl Octal for MountPropagationFlags

impl Octal for OFlags

impl Octal for RenameFlags

impl Octal for ResolveFlags

impl Octal for SealFlags

impl Octal for StatVfsMountFlags

impl Octal for StatxFlags

impl Octal for UnmountFlags

impl Octal for XattrFlags

impl Octal for DupFlags

impl Octal for ReadWriteFlags

impl Octal for EventFlags

impl Octal for IoringAcceptFlags

impl Octal for IoringAsyncCancelFlags

impl Octal for IoringCqFlags

impl Octal for IoringCqeFlags

impl Octal for IoringEnterFlags

impl Octal for IoringFeatureFlags

impl Octal for IoringFsyncFlags

impl Octal for IoringMsgringFlags

impl Octal for IoringOpFlags

impl Octal for IoringPollFlags

impl Octal for IoringRecvFlags

impl Octal for IoringRegisterFlags

impl Octal for IoringRsrcFlags

impl Octal for IoringSendFlags

impl Octal for IoringSetupFlags

impl Octal for IoringSqFlags

impl Octal for IoringSqeFlags

impl Octal for IoringTimeoutFlags

impl Octal for RecvFlags

impl Octal for RecvmsgOutFlags

impl Octal for SendFlags

impl Octal for SocketFlags

impl Octal for devela::_dep::rustix::io_uring::SpliceFlags

impl Octal for MapFlags

impl Octal for MlockAllFlags

impl Octal for MlockFlags

impl Octal for MprotectFlags

impl Octal for MremapFlags

impl Octal for MsyncFlags

impl Octal for ProtFlags

impl Octal for UserfaultfdFlags

impl Octal for FsMountFlags

impl Octal for FsOpenFlags

impl Octal for FsPickFlags

impl Octal for MountAttrFlags

impl Octal for MoveMountFlags

impl Octal for OpenTreeFlags

impl Octal for SockaddrXdpFlags

impl Octal for XdpDescOptions

impl Octal for XdpOptionsFlags

impl Octal for XdpRingFlags

impl Octal for XdpUmemRegFlags

impl Octal for PipeFlags

impl Octal for devela::_dep::rustix::pipe::SpliceFlags

impl Octal for FloatingPointEmulationControl

impl Octal for FloatingPointExceptionMode

impl Octal for MembarrierQuery

impl Octal for PidfdFlags

impl Octal for PidfdGetfdFlags

impl Octal for SpeculationFeatureControl

impl Octal for SpeculationFeatureState

impl Octal for UnalignedAccessControl

impl Octal for WaitOptions

impl Octal for WaitidOptions

impl Octal for OpenptFlags

impl Octal for GetRandomFlags

impl Octal for ShmOFlags

impl Octal for ControlModes

impl Octal for InputModes

impl Octal for LocalModes

impl Octal for OutputModes

impl Octal for CapabilitiesSecureBits

impl Octal for CapabilityFlags

impl Octal for devela::_dep::rustix::thread::FutexFlags

impl Octal for TaggedAddressMode

impl Octal for ThreadNameSpaceType

impl Octal for UnshareFlags

impl Octal for TimerfdFlags

impl Octal for TimerfdTimerFlags

impl Octal for devela::_dep::sdl2::image::InitFlag

impl Octal for devela::_dep::sdl2::keyboard::Mod

impl Octal for devela::_dep::sdl2::messagebox::MessageBoxButtonFlag

impl Octal for devela::_dep::sdl2::messagebox::MessageBoxFlag

impl Octal for devela::_dep::sdl2::mixer::InitFlag

impl Octal for FontStyle

impl Octal for GlobFlags

impl Octal for devela::_dep::sdl3::keyboard::Mod

impl Octal for devela::_dep::sdl3::messagebox::MessageBoxButtonFlag

impl Octal for devela::_dep::sdl3::messagebox::MessageBoxFlag

impl Octal for Channels

impl Octal for f32x4

impl Octal for f32x8

impl Octal for f64x2

impl Octal for f64x4

impl Octal for i8x16

impl Octal for i8x32

impl Octal for i16x8

impl Octal for i16x16

impl Octal for i32x4

impl Octal for i32x8

impl Octal for i64x2

impl Octal for i64x4

impl Octal for u8x16

impl Octal for u16x8

impl Octal for u16x16

impl Octal for u32x4

impl Octal for u32x8

impl Octal for u64x2

impl Octal for u64x4

impl Octal for ExampleBitfield

Available on crate feature _bit_u8 and (doc or test) only.

impl Octal for ExampleBitfieldCustom

Available on crate feature _bit_u8 and (doc or test) only.

impl Octal for ExampleBitfieldExtra

Available on crate feature _bit_u8 and (doc or test) only.

impl Octal for ExampleEnumSet

Available on doc or test only.

impl Octal for char7

impl Octal for char8

impl Octal for char16

impl Octal for DrumFrame8

Available on crate feature audio only.

impl Octal for m128

impl Octal for m128d

impl Octal for m128i

impl Octal for m256

impl Octal for m256d

impl Octal for m256i

impl Octal for EfdFlags

impl Octal for EpollCreateFlags

impl Octal for EpollFlags

impl Octal for EventMask

impl Octal for Flags

impl Octal for PortCap

impl Octal for PortType

impl Octal for Remove

impl Octal for Transformations

impl Octal for WatchMask

impl<'a, I> Octal for Format<'a, I>

where I: Iterator, <I as Iterator>::Item: Octal,

impl<'t, T, F, U> Octal for OptionFmtOrElse<'t, T, F>

where T: Octal, F: Fn() -> U, U: Display,

impl<'t, T, U> Octal for OptionFmtOr<'t, T, U>

where T: Octal, U: Display,

impl<T> Octal for &T

where T: Octal + ?Sized,

impl<T> Octal for &mut T

where T: Octal + ?Sized,

impl<T> Octal for NonZero<T>

where T: ZeroablePrimitive + Octal,

impl<T> Octal for OptionFmt<'_, T>

where T: Octal,

impl<T> Octal for Saturating<T>

where T: Octal,

impl<T> Octal for Wrapping<T>

where T: Octal,

impl<T: Octal> Octal for Frac<T>

impl<T: Octal> Octal for Int<T>

impl<T: Octal> Octal for Bitwise<T>

impl<const V: i8> Octal for devela::_info::examples::niche::NonValueI8<V>

Available on doc or test only.

impl<const V: i8> Octal for devela::all::NonValueI8<V>

impl<const V: u8> Octal for NonValueU8<V>

impl<const V: u16> Octal for NonValueU16<V>