Trait MaxEncodedLen

Source

pub trait MaxEncodedLen: Encode {
    // Required method
    fn max_encoded_len() -> usize;
}

Expand description

Items implementing MaxEncodedLen have a statically known maximum encoded size.

Some containers, such as BoundedVec, have enforced size limits and this trait can be implemented accurately. Other containers, such as StorageMap, do not have enforced size limits. For those containers, it is necessary to make a documented assumption about the maximum usage, and compute the max encoded length based on that assumption.

Required Methods§

Source

fn max_encoded_len() -> usize

Upper bound, in bytes, of the maximum encoded size of this item.

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.

MaxEncodedLen

Trait MaxEncodedLen Copy item path

Required Methods§

fn max_encoded_len() -> usize

Dyn Compatibility§

Implementations on Foreign Types§

impl MaxEncodedLen for bool

fn max_encoded_len() -> usize

impl MaxEncodedLen for i8

fn max_encoded_len() -> usize

impl MaxEncodedLen for i16

fn max_encoded_len() -> usize

impl MaxEncodedLen for i32

fn max_encoded_len() -> usize

impl MaxEncodedLen for i64

fn max_encoded_len() -> usize

impl MaxEncodedLen for i128

fn max_encoded_len() -> usize

impl MaxEncodedLen for u8

fn max_encoded_len() -> usize

impl MaxEncodedLen for u16

fn max_encoded_len() -> usize

impl MaxEncodedLen for u32

fn max_encoded_len() -> usize

impl MaxEncodedLen for u64

fn max_encoded_len() -> usize

impl MaxEncodedLen for u128

fn max_encoded_len() -> usize

impl MaxEncodedLen for ()

fn max_encoded_len() -> usize

impl MaxEncodedLen for Duration

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroI8

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroI16

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroI32

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroI64

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroI128

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroU8

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroU16

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroU32

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroU64

fn max_encoded_len() -> usize

impl MaxEncodedLen for NonZeroU128

fn max_encoded_len() -> usize

impl<T> MaxEncodedLen for PhantomData<T>

fn max_encoded_len() -> usize

impl<T, E> MaxEncodedLen for Result<T, E>where T: MaxEncodedLen, E: MaxEncodedLen,

fn max_encoded_len() -> usize

impl<T: MaxEncodedLen> MaxEncodedLen for Option<T>

fn max_encoded_len() -> usize

impl<T: MaxEncodedLen> MaxEncodedLen for Box<T>

fn max_encoded_len() -> usize

impl<T: MaxEncodedLen> MaxEncodedLen for Arc<T>

fn max_encoded_len() -> usize

impl<T: MaxEncodedLen> MaxEncodedLen for Range<T>

fn max_encoded_len() -> usize

impl<T: MaxEncodedLen> MaxEncodedLen for RangeInclusive<T>

fn max_encoded_len() -> usize

impl<T: MaxEncodedLen, const N: usize> MaxEncodedLen for [T; N]

fn max_encoded_len() -> usize

impl<TupleElement0: MaxEncodedLen> MaxEncodedLen for (TupleElement0,)

fn max_encoded_len() -> usize

impl<TupleElement0: MaxEncodedLen, TupleElement1: MaxEncodedLen> MaxEncodedLen for (TupleElement0, TupleElement1)

fn max_encoded_len() -> usize

impl<TupleElement0: MaxEncodedLen, TupleElement1: MaxEncodedLen, TupleElement2: MaxEncodedLen> MaxEncodedLen for (TupleElement0, TupleElement1, TupleElement2)

fn max_encoded_len() -> usize

impl<TupleElement0: MaxEncodedLen, TupleElement1: MaxEncodedLen, TupleElement2: MaxEncodedLen, TupleElement3: MaxEncodedLen> MaxEncodedLen for (TupleElement0, TupleElement1, TupleElement2, TupleElement3)

fn max_encoded_len() -> usize

impl<TupleElement0: MaxEncodedLen, TupleElement1: MaxEncodedLen, TupleElement2: MaxEncodedLen, TupleElement3: MaxEncodedLen, TupleElement4: MaxEncodedLen> MaxEncodedLen for (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4)

fn max_encoded_len() -> usize

impl<TupleElement0: MaxEncodedLen, TupleElement1: MaxEncodedLen, TupleElement2: MaxEncodedLen, TupleElement3: MaxEncodedLen, TupleElement4: MaxEncodedLen, TupleElement5: MaxEncodedLen> MaxEncodedLen for (TupleElement0, TupleElement1, TupleElement2, TupleElement3, TupleElement4, TupleElement5)

fn max_encoded_len() -> usize

Trait MaxEncodedLen

impl<T, E> MaxEncodedLen for Result<T, E>
where T: MaxEncodedLen, E: MaxEncodedLen,