pub trait LowerHex {
// Required method
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>;
}Expand description
x formatting.
The LowerHex trait should format its output as a number in hexadecimal, with a through f
in lower case.
For primitive signed integers (i8 to i128, and isize),
negative values are formatted as the two’s complement representation.
The alternate flag, #, adds a 0x in front of the output.
For more information on formatters, see the module-level documentation.
§Examples
Basic usage with i32:
let y = 42; // 42 is '2a' in hex
assert_eq!(format!("{y:x}"), "2a");
assert_eq!(format!("{y:#x}"), "0x2a");
assert_eq!(format!("{:x}", -16), "fffffff0");Implementing LowerHex on a type:
use std::fmt;
struct Length(i32);
impl fmt::LowerHex for Length {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let val = self.0;
fmt::LowerHex::fmt(&val, f) // delegate to i32's implementation
}
}
let l = Length(9);
assert_eq!(format!("l as hex is: {l:x}"), "l as hex is: 9");
assert_eq!(format!("l as hex is: {l:#010x}"), "l as hex is: 0x00000009");Required Methods§
1.0.0 · Sourcefn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
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.
Dyn Compatibility§
This trait is dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety".
Implementors§
impl LowerHex for Access
impl LowerHex for AccessControlOptions
impl LowerHex for AtFlags
impl LowerHex for AtFlags
impl LowerHex for Bytes
impl LowerHex for BytesMut
impl LowerHex for CloneFlags
impl LowerHex for CopyfileFlags
impl LowerHex for DupFlags
impl LowerHex for EventFlags
impl LowerHex for FallocateFlags
impl LowerHex for FdFlags
impl LowerHex for Flags
impl LowerHex for Flags
impl LowerHex for Gid
impl LowerHex for MapFlags
impl LowerHex for Mode
impl LowerHex for MprotectFlags
impl LowerHex for MsyncFlags
impl LowerHex for OFlags
impl LowerHex for OpCodeFlag
impl LowerHex for Pid
impl LowerHex for PollFlags
impl LowerHex for PosixSpawnFlags
impl LowerHex for ProcessEvents
impl LowerHex for ProtFlags
impl LowerHex for RecvFlags
impl LowerHex for RenameFlags
impl LowerHex for ReturnFlags
impl LowerHex for RevocationPolicy
impl LowerHex for SaFlags
impl LowerHex for SendFlags
impl LowerHex for SignedAttributes
impl LowerHex for SocketFlags
impl LowerHex for StatVfsMountFlags
impl LowerHex for TrustOptions
impl LowerHex for Uid
impl LowerHex for UserFlags
impl LowerHex for VnodeEvents
impl LowerHex for WaitIdOptions
impl LowerHex for WaitOptions
impl LowerHex for WaitPidFlag
impl LowerHex for XattrFlags
impl LowerHex for bf16
Available on non-SPIR-V only.
impl LowerHex for f16
Available on non-SPIR-V only.