Trait rocket::form::validate::Len

pub trait Len<L> {
    // Required methods
    fn len(&self) -> L;
    fn len_into_u64(len: L) -> u64;
    fn zero_len() -> L;
}

Types for values that have a length.

At present, these are:

type	length description
&str, String	length in bytes
Vec<T>	number of elements in the vector
HashMap<K, V>, BTreeMap<K, V>	number of key/value pairs in the map
TempFile	length of the file in bytes
Option<T> where T: Len	length of T or 0 if None
form::Result<'_, T>	length of T or 0 if Err

Required Methods

fn len(&self) -> L

The length of the value.

fn len_into_u64(len: L) -> u64

Convert len into u64.

fn zero_len() -> L

The zero value for L.

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl Len<usize> for str

fn len(&self) -> usize

fn len_into_u64(len: usize) -> u64

fn zero_len() -> usize

impl<L, T: Len<L> + ?Sized> Len<L> for &T

fn len(&self) -> L

fn len_into_u64(len: L) -> u64

fn zero_len() -> L

Implementors

impl Len<u64> for TempFile<'_>

impl Len<usize> for String

impl Len<ByteUnit> for TempFile<'_>

impl<K, V> Len<usize> for BTreeMap<K, V>

impl<K, V> Len<usize> for HashMap<K, V>

impl<L, T: Len<L>> Len<L> for Option<T>

impl<L, T: Len<L>> Len<L> for Capped<T>

impl<L, T: Len<L>> Len<L> for Json<T>

impl<L, T: Len<L>> Len<L> for MsgPack<T>

impl<L, T: Len<L>> Len<L> for Result<'_, T>

impl<T> Len<usize> for Vec<T>