1.0.0[][src]Struct sgx_tstd::fmt::Arguments

pub struct Arguments<'a> { /* fields omitted */ }

This structure represents a safely precompiled version of a format string and its arguments. This cannot be generated at runtime because it cannot safely be done, so no constructors are given and the fields are private to prevent modification.

The format_args! macro will safely create an instance of this structure. The macro validates the format string at compile-time so usage of the write() and format() functions can be safely performed.

You can use the Arguments<'a> that format_args! returns in Debug and Display contexts as seen below. The example also shows that Debug and Display format to the same thing: the interpolated format string in format_args!.

let debug = format!("{:?}", format_args!("{} foo {:?}", 1, 2));
let display = format!("{}", format_args!("{} foo {:?}", 1, 2));
assert_eq!("1 foo 2", display);
assert_eq!(display, debug);


impl<'a> Arguments<'a>[src]

pub fn as_str(&self) -> Option<&'static str>[src]

🔬 This is a nightly-only experimental API. (fmt_as_str)

Get the formatted string, if it has no arguments to be formatted.

This can be used to avoid allocations in the most trivial case.



use core::fmt::Arguments;

fn write_str(_: &str) { /* ... */ }

fn write_fmt(args: &Arguments) {
    if let Some(s) = args.as_str() {
    } else {

assert_eq!(format_args!("hello").as_str(), Some("hello"));
assert_eq!(format_args!("").as_str(), Some(""));
assert_eq!(format_args!("{}", 1).as_str(), None);

Trait Implementations

impl<'a> Clone for Arguments<'a>[src]

impl<'a> Copy for Arguments<'a>[src]

impl<'_> Debug for Arguments<'_>[src]

impl<'_> Display for Arguments<'_>[src]

Auto Trait Implementations

impl<'a> !RefUnwindSafe for Arguments<'a>

impl<'a> !Send for Arguments<'a>

impl<'a> !Sync for Arguments<'a>

impl<'a> Unpin for Arguments<'a>

impl<'a> !UnwindSafe for Arguments<'a>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized

impl<T> Borrow<T> for T where
    T: ?Sized

impl<T> BorrowMut<T> for T where
    T: ?Sized

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 

impl<T> ToOwned for T where
    T: Clone

type Owned = T

The resulting type after obtaining ownership.

impl<T> ToString for T where
    T: Display + ?Sized

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.