Struct jsonrpsee_types::params::ParamsSequence
source · [−]pub struct ParamsSequence<'a>(_);
Expand description
An Iterator
-like parser for a sequence of Params
.
This will parse the params one at a time, and allows for graceful handling of optional parameters at the tail; other
use cases are likely better served by Params::parse
. The reason this is not an actual Iterator
is that
params parsing (often) yields values of different types.
Regards empty array []
as no parameters provided.
Implementations
sourceimpl<'a> ParamsSequence<'a>
impl<'a> ParamsSequence<'a>
sourcepub fn next<T>(&mut self) -> Result<T, CallError> where
T: Deserialize<'a>,
pub fn next<T>(&mut self) -> Result<T, CallError> where
T: Deserialize<'a>,
Parse the next parameter to type T
let params = Params::new(Some(r#"[true, 10, "foo"]"#));
let mut seq = params.sequence();
let a: bool = seq.next().unwrap();
let b: i32 = seq.next().unwrap();
let c: &str = seq.next().unwrap();
assert_eq!(a, true);
assert_eq!(b, 10);
assert_eq!(c, "foo");
sourcepub fn optional_next<T>(&mut self) -> Result<Option<T>, CallError> where
T: Deserialize<'a>,
pub fn optional_next<T>(&mut self) -> Result<Option<T>, CallError> where
T: Deserialize<'a>,
Parse the next optional parameter to type Option<T>
.
The result will be None
for null
, and for missing values in the supplied JSON array.
let params = Params::new(Some(r#"[1, 2, null]"#));
let mut seq = params.sequence();
let params: [Option<u32>; 4] = [
seq.optional_next().unwrap(),
seq.optional_next().unwrap(),
seq.optional_next().unwrap(),
seq.optional_next().unwrap(),
];
assert_eq!(params, [Some(1), Some(2), None, None]);
Trait Implementations
Auto Trait Implementations
impl<'a> RefUnwindSafe for ParamsSequence<'a>
impl<'a> Send for ParamsSequence<'a>
impl<'a> Sync for ParamsSequence<'a>
impl<'a> Unpin for ParamsSequence<'a>
impl<'a> UnwindSafe for ParamsSequence<'a>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
sourcefn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> where
S: Into<Dispatch>,
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more