rama::crypto::dep::x509_parser::prelude::asn1_rs::nom::lib::std::fmt

Trait Debug

1.0.0 · Source

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

Available on crate features crypto and std only.

Expand description

? formatting.

Debug should format the output in a programmer-facing, debugging context.

Generally speaking, you should just derive a Debug implementation.

When used with the alternate format specifier #?, the output is pretty-printed.

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

This trait can be used with #[derive] if all fields implement Debug. When derived for structs, it will use the name of the struct, then {, then a comma-separated list of each field’s name and Debug value, then }. For enums, it will use the name of the variant and, if applicable, (, then the Debug values of the fields, then ).

§Stability

Derived Debug formats are not stable, and so may change with future Rust versions. Additionally, Debug implementations of types provided by the standard library (std, core, alloc, etc.) are not stable, and may also change with future Rust versions.

§Examples

Deriving an implementation:

#[derive(Debug)]
struct Point {
    x: i32,
    y: i32,
}

let origin = Point { x: 0, y: 0 };

assert_eq!(
    format!("The origin is: {origin:?}"),
    "The origin is: Point { x: 0, y: 0 }",
);

Manually implementing:

use std::fmt;

struct Point {
    x: i32,
    y: i32,
}

impl fmt::Debug for Point {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Point")
         .field("x", &self.x)
         .field("y", &self.y)
         .finish()
    }
}

let origin = Point { x: 0, y: 0 };

assert_eq!(
    format!("The origin is: {origin:?}"),
    "The origin is: Point { x: 0, y: 0 }",
);

There are a number of helper methods on the Formatter struct to help you with manual implementations, such as debug_struct.

Types that do not wish to use the standard suite of debug representations provided by the Formatter trait (debug_struct, debug_tuple, debug_list, debug_set, debug_map) can do something totally custom by manually writing an arbitrary representation to the Formatter.

impl fmt::Debug for Point {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Point [{} {}]", self.x, self.y)
    }
}

Debug implementations using either derive or the debug builder API on Formatter support pretty-printing using the alternate flag: {:#?}.

Pretty-printing with #?:

#[derive(Debug)]
struct Point {
    x: i32,
    y: i32,
}

let origin = Point { x: 0, y: 0 };

let expected = "The origin is: Point {
    x: 0,
    y: 0,
}";
assert_eq!(format!("The origin is: {origin:#?}"), expected);

Required Methods§

1.0.0 · Source

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.

§Examples

use std::fmt;

struct Position {
    longitude: f32,
    latitude: f32,
}

impl fmt::Debug for Position {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_tuple("")
         .field(&self.longitude)
         .field(&self.latitude)
         .finish()
    }
}

let position = Position { longitude: 1.987, latitude: 2.983 };
assert_eq!(format!("{position:?}"), "(1.987, 2.983)");

assert_eq!(format!("{position:#?}"), "(
    1.987,
    2.983,
)");

Dyn Compatibility§

This trait is dyn compatible.

impl Debug for BorrowedFormatItem<'_>

impl Debug for CStr

Shows the underlying bytes as a normal string, with invalid UTF-8 presented as hex escape sequences.

1.0.0 · Source§

impl Debug for CString

impl Debug for CertIssueDeniedError

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impl Debug for CertIssuerHttpClient

Available on crate features http and tls only.

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impl Debug for CertOrderInput

Available on crate features http and tls only.

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impl Debug for CertOrderOutput

Available on crate features http and tls only.

Converts a DateTime into a human readable datetime string.

(This Debug representation currently emits the same string as the Display representation, but this is not a guarantee.)

Options currently supported:

std::fmt::Formatter::precision can be set to control the precision of the fractional second component.

§Example

use jiff::civil::date;

let dt = date(2024, 6, 15).at(7, 0, 0, 123_000_000);
assert_eq!(format!("{dt:.6?}"), "2024-06-15T07:00:00.123000");
// Precision values greater than 9 are clamped to 9.
assert_eq!(format!("{dt:.300?}"), "2024-06-15T07:00:00.123000000");
// A precision of 0 implies the entire fractional
// component is always truncated.
assert_eq!(format!("{dt:.0?}"), "2024-06-15T07:00:00");

impl Debug for Event

Available on crate features cli and haproxy and http and net only.

impl Debug for untrusted::input::Input<'_>

The value is intentionally omitted from the output to avoid leaking secrets.

impl Debug for ProxyStage

Available on crate features http-full and http only.

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impl Debug for ProxyTarget

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impl Debug for ProxyTargetFromGetSocketnameLayer

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impl Debug for ProxyTargetFromRequestContextLayer

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impl Debug for ProxyTunnelStage

Available on crate features http-full and http only.

impl Debug for RecvFlags

Available on neither Redox OS nor WASI.

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impl Debug for rama::http::grpc::service::opentelemetry::proto::trace::v1::Span

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impl Debug for proc_macro2::Span

Prints a span in a form convenient for debugging.

1.29.0 · Source§

impl Debug for proc_macro::Span

Prints a span in a form convenient for debugging.

use nu_ansi_term::Color::{Red, Blue};
assert_eq!("Style { fg(Red), on(Blue), bold, italic }",
           format!("{:?}", Red.on(Blue).bold().italic()));

impl Debug for ThreadRng

Debug implementation does not leak internal state

Converts a Time into a human readable time string.

(This Debug representation currently emits the same string as the Display representation, but this is not a guarantee.)

Options currently supported:

std::fmt::Formatter::precision can be set to control the precision of the fractional second component.

§Example

use jiff::civil::time;

let t = time(7, 0, 0, 123_000_000);
assert_eq!(format!("{t:.6?}"), "07:00:00.123000");
// Precision values greater than 9 are clamped to 9.
assert_eq!(format!("{t:.300?}"), "07:00:00.123000000");
// A precision of 0 implies the entire fractional
// component is always truncated.
assert_eq!(format!("{t:.0?}"), "07:00:00");

Converts a Timestamp datetime into a human readable datetime string.

(This Debug representation currently emits the same string as the Display representation, but this is not a guarantee.)

Options currently supported:

std::fmt::Formatter::precision can be set to control the precision of the fractional second component.

§Example

use jiff::Timestamp;

let ts = Timestamp::new(1_123_456_789, 123_000_000)?;
assert_eq!(
    format!("{ts:.6?}"),
    "2005-08-07T23:19:49.123000Z",
);
// Precision values greater than 9 are clamped to 9.
assert_eq!(
    format!("{ts:.300?}"),
    "2005-08-07T23:19:49.123000000Z",
);
// A precision of 0 implies the entire fractional
// component is always truncated.
assert_eq!(
    format!("{ts:.0?}"),
    "2005-08-07T23:19:49Z",
);

1.15.0 · Source§

impl Debug for proc_macro::TokenStream

Prints tokens in a form convenient for debugging.

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impl Debug for proc_macro2::TokenTree

Prints token tree in a form convenient for debugging.

1.29.0 · Source§

impl Debug for proc_macro::TokenTree

Prints token tree in a form convenient for debugging.

Available on crate features cli and haproxy and http and net only.

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impl Debug for TransportContext

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impl Debug for TransportProtocol

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impl Debug for TransportStage

Available on crate features http-full and http only.

Debug the serialization of this URL.

Converts a Zoned datetime into a human readable datetime string.

(This Debug representation currently emits the same string as the Display representation, but this is not a guarantee.)

Options currently supported:

std::fmt::Formatter::precision can be set to control the precision of the fractional second component.

§Example

use jiff::civil::date;

let zdt = date(2024, 6, 15).at(7, 0, 0, 123_000_000).in_tz("US/Eastern")?;
assert_eq!(
    format!("{zdt:.6?}"),
    "2024-06-15T07:00:00.123000-04:00[US/Eastern]",
);
// Precision values greater than 9 are clamped to 9.
assert_eq!(
    format!("{zdt:.300?}"),
    "2024-06-15T07:00:00.123000000-04:00[US/Eastern]",
);
// A precision of 0 implies the entire fractional
// component is always truncated.
assert_eq!(
    format!("{zdt:.0?}"),
    "2024-06-15T07:00:00-04:00[US/Eastern]",
);

impl<'a, R> Debug for ScopeFromRoot<'a, R>
where R: LookupSpan<'a>,

Available on crate features alloc or std only.

impl<'name, 'bufs, 'control> Debug for MsgHdr<'name, 'bufs, 'control>

Available on neither Redox OS nor WASI.

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impl<'name, 'bufs, 'control> Debug for MsgHdrMut<'name, 'bufs, 'control>

Available on neither Redox OS nor WASI.

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impl<H, M> Debug for HijackLayer<H, M>
where H: Debug, M: Debug,

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impl<H: Debug> Debug for EchoServiceBuilder<H>

Available on crate features cli and haproxy and http and net only.

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impl<H: Debug> Debug for FsServiceBuilder<H>

Available on crate features cli and haproxy and http and net only.

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impl<S: Debug> Debug for ProxyConnector<S>

Available on crate features http-full and http only.

impl<T> Debug for core::sync::atomic::Atomic<*mut T>

Available on target_has_atomic_load_store=ptr only.

Available on crate feature alloc only.

impl<const SEPARATOR: char> Debug for Composer<SEPARATOR>

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Debug

Trait Debug Copy item path

§Stability

§Examples

Required Methods§

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

§Errors

§Examples

Dyn Compatibility§

Implementors§

impl Debug for !

impl Debug for ()

impl Debug for A

impl Debug for AAAA

impl Debug for ACCESS_DESCRIPTION_st

impl Debug for AHasher

impl Debug for ANAME

impl Debug for ASN1DateTime

impl Debug for ASN1Error

impl Debug for ASN1ErrorKind

impl Debug for ASN1Time

impl Debug for ASN1TimeZone

impl Debug for ASN1_ADB_TABLE_st

impl Debug for ASN1_ADB_st

impl Debug for ASN1_AUX_st

impl Debug for ASN1_ITEM_st

impl Debug for ASN1_ITEM_st

impl Debug for ASN1_TEMPLATE_st

impl Debug for ASN1_TEMPLATE_st

impl Debug for ASN1_TLC_st

impl Debug for ASN1_VALUE_st

impl Debug for ASN1_VALUE_st

impl Debug for ATerm

impl Debug for AUTHORITY_KEYID_st

impl Debug for AUTHORITY_KEYID_st

impl Debug for Abi

impl Debug for AbortController

impl Debug for AbortHandle

impl Debug for rama::futures::prelude::future::AbortHandle

impl Debug for AbortRegistration

impl Debug for rama::layer::abort::Aborted

impl Debug for rama::futures::prelude::future::Aborted

impl Debug for Accept

impl Debug for AcceptEncoding

impl Debug for AcceptRanges

impl Debug for Accepted

impl Debug for AcceptedAlert

impl Debug for AcceptedWebSocketData

impl Debug for AcceptedWebSocketProtocol

impl Debug for Access

impl Debug for AccessControlAllowCredentials

impl Debug for AccessControlAllowHeaders

impl Debug for AccessControlAllowMethods

impl Debug for AccessControlAllowOrigin

impl Debug for AccessControlAllowPrivateNetwork

impl Debug for AccessControlExposeHeaders

impl Debug for AccessControlMaxAge

impl Debug for AccessControlRequestHeaders

impl Debug for AccessControlRequestMethod

impl Debug for AccessControlRequestPrivateNetwork

impl Debug for AccessControlSet

impl Debug for AccessError

impl Debug for Account

impl Debug for AccountStatus

impl Debug for AcmeClient

impl Debug for AcmeProvider

impl Debug for Acquire<'_>

impl Debug for AcquireArc

impl Debug for AcquireError

impl Debug for Action

impl Debug for ActiveSlot

impl Debug for AddAuthorizationLayer

impl Debug for AddRequiredRequestHeadersLayer

impl Debug for AddRequiredResponseHeadersLayer

impl Debug for core::net::parser::AddrParseError

impl Debug for rama::crypto::dep::pki_types::AddrParseError

impl Debug for rama::net::stream::dep::ipnet::AddrParseError

impl Debug for AddrParseError

impl Debug for AddressFamily

impl Debug for AddressType

Trait Debug