Struct massa_models::config::constants::END_TIMESTAMP
source · pub struct END_TIMESTAMP {
__private_field: (),
}
Expand description
TESTNET: time when the blockclique is ended.
Fields§
§__private_field: ()
Methods from Deref<Target = Option<MassaTime>>§
1.0.0 · sourcepub fn as_ref(&self) -> Option<&T>
pub fn as_ref(&self) -> Option<&T>
Converts from &Option<T>
to Option<&T>
.
Examples
Calculates the length of an Option<String>
as an Option<usize>
without moving the String
. The map
method takes the self
argument by value,
consuming the original, so this technique uses as_ref
to first take an Option
to a
reference to the value inside the original.
let text: Option<String> = Some("Hello, world!".to_string());
// First, cast `Option<String>` to `Option<&String>` with `as_ref`,
// then consume *that* with `map`, leaving `text` on the stack.
let text_length: Option<usize> = text.as_ref().map(|s| s.len());
println!("still can print text: {text:?}");
sourcepub fn as_slice(&self) -> &[T]
🔬This is a nightly-only experimental API. (option_as_slice
)
pub fn as_slice(&self) -> &[T]
option_as_slice
)Returns a slice of the contained value, if any. If this is None
, an
empty slice is returned. This can be useful to have a single type of
iterator over an Option
or slice.
Note: Should you have an Option<&T>
and wish to get a slice of T
,
you can unpack it via opt.map_or(&[], std::slice::from_ref)
.
Examples
#![feature(option_as_slice)]
assert_eq!(
[Some(1234).as_slice(), None.as_slice()],
[&[1234][..], &[][..]],
);
The inverse of this function is (discounting
borrowing) [_]::first
:
#![feature(option_as_slice)]
for i in [Some(1234_u16), None] {
assert_eq!(i.as_ref(), i.as_slice().first());
}
1.40.0 · sourcepub fn as_deref(&self) -> Option<&<T as Deref>::Target>where
T: Deref,
pub fn as_deref(&self) -> Option<&<T as Deref>::Target>where T: Deref,
Converts from Option<T>
(or &Option<T>
) to Option<&T::Target>
.
Leaves the original Option in-place, creating a new one with a reference
to the original one, additionally coercing the contents via Deref
.
Examples
let x: Option<String> = Some("hey".to_owned());
assert_eq!(x.as_deref(), Some("hey"));
let x: Option<String> = None;
assert_eq!(x.as_deref(), None);
Trait Implementations§
source§impl Deref for END_TIMESTAMP
impl Deref for END_TIMESTAMP
impl LazyStatic for END_TIMESTAMP
Auto Trait Implementations§
impl RefUnwindSafe for END_TIMESTAMP
impl Send for END_TIMESTAMP
impl Sync for END_TIMESTAMP
impl Unpin for END_TIMESTAMP
impl UnwindSafe for END_TIMESTAMP
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