Trait ValueObjectAccessTryAsScalar

pub trait ValueObjectAccessTryAsScalar {
    type Key: ?Sized;

    // Required methods
    fn try_get_bool<Q>(&self, k: &Q) -> Result<Option<bool>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_i128<Q>(&self, k: &Q) -> Result<Option<i128>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_i64<Q>(&self, k: &Q) -> Result<Option<i64>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_i32<Q>(&self, k: &Q) -> Result<Option<i32>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_i16<Q>(&self, k: &Q) -> Result<Option<i16>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_i8<Q>(&self, k: &Q) -> Result<Option<i8>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_u128<Q>(&self, k: &Q) -> Result<Option<u128>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_u64<Q>(&self, k: &Q) -> Result<Option<u64>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_usize<Q>(&self, k: &Q) -> Result<Option<usize>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_u32<Q>(&self, k: &Q) -> Result<Option<u32>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_u16<Q>(&self, k: &Q) -> Result<Option<u16>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_u8<Q>(&self, k: &Q) -> Result<Option<u8>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_f64<Q>(&self, k: &Q) -> Result<Option<f64>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_f32<Q>(&self, k: &Q) -> Result<Option<f32>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
    fn try_get_str<Q>(&self, k: &Q) -> Result<Option<&str>, TryTypeError>
       where Self::Key: Borrow<Q>,
             Q: Hash + Eq + Ord + ?Sized;
}

try_as_* access to scalar values in an object

Required Associated Types

type Key: ?Sized

The type for Objects

Required Methods

fn try_get_bool<Q>(&self, k: &Q) -> Result<Option<bool>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a bool, returns an error if it isn’t bool

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_i128<Q>(&self, k: &Q) -> Result<Option<i128>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a i128, returns an error if it isn’t i128

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_i64<Q>(&self, k: &Q) -> Result<Option<i64>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a i64, returns an error if it isn’t a i64

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_i32<Q>(&self, k: &Q) -> Result<Option<i32>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a i32, returns an error if it isn’t a i32

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_i16<Q>(&self, k: &Q) -> Result<Option<i16>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a i16, returns an error if it isn’t a i16

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_i8<Q>(&self, k: &Q) -> Result<Option<i8>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a i8, returns an error if it isn’t a i8

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_u128<Q>(&self, k: &Q) -> Result<Option<u128>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a u128, returns an error if it isn’t a u128

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_u64<Q>(&self, k: &Q) -> Result<Option<u64>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a u64, returns an error if it isn’t a u64

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_usize<Q>(&self, k: &Q) -> Result<Option<usize>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a usize, returns an error if it isn’t a usize

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_u32<Q>(&self, k: &Q) -> Result<Option<u32>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a u32, returns an error if it isn’t a u32

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_u16<Q>(&self, k: &Q) -> Result<Option<u16>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a u16, returns an error if it isn’t a u16

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_u8<Q>(&self, k: &Q) -> Result<Option<u8>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a u8, returns an error if it isn’t a u8

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_f64<Q>(&self, k: &Q) -> Result<Option<f64>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a f64, returns an error if it isn’t a f64

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_f32<Q>(&self, k: &Q) -> Result<Option<f32>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a f32, returns an error if it isn’t a f32

Errors

if the requested type doesn’t match the actual type or the value is not an object

fn try_get_str<Q>(&self, k: &Q) -> Result<Option<&str>, TryTypeError>

where Self::Key: Borrow<Q>, Q: Hash + Eq + Ord + ?Sized,

Tries to get an element of an object as a str, returns an error if it isn’t a str

Errors

if the requested type doesn’t match the actual type or the value is not an object

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<'tape, 'input> ValueObjectAccessTryAsScalar for Value<'tape, 'input>

type Key = str

impl<T> ValueObjectAccessTryAsScalar for T

where T: ValueObjectTryAccess + TypedValue, <T as ValueObjectTryAccess>::Target: ValueTryAsScalar,

type Key = <T as ValueObjectTryAccess>::Key