Trait Len 

pub trait Len {
    // Required method
    fn len(&self) -> usize;
}

Trait defining instance method len() : usize that indicates whether the implementing type instance is logically empty.

Additional Implementations on Foreign Types

Built-in Types

If the feature "implement-Len-for-built_ins" is defined (as it is by "default"), then this is also implemented for the following types:

• str;
• [T; N];
• [T];

Standard Collection Types

If the feature "implement-Len-for-standard_collection_types" is defined (as it is by "default"), then this is also implemented for the following types:

• std::collections::BTreeMap;
• std::collections::BTreeSet;
• std::collections::BinaryHeap;
• std::collections::HashMap;
• std::collections::HashSet;
• std::collections::LinkedList;
• String;
• Vec;
• std::collections::VecDeque;

Standard FFI Types

If the feature "implement-Len-for-standard_ffi_types" is defined (as it is by "default"), then this is also implemented for the following types:

• std::ffi::CStr;
• std::ffi::CString;

Standard Path Types

If the feature "implement-Len-for-standard_path_types" is defined (as it is by "default"), then this is also implemented for the following types:

• std::path::Path;
• std::path::PathBuf;

Standard Process Types

If the feature "implement-Len-for-standard_process_types" is defined (as it is by "default"), then this is also implemented for the following types:

• std::process::CommandArgs;
• std::process::CommandEnvs;

Required Methods

fn len(&self) -> usize

Implementations on Foreign Types

impl Len for &str

fn len(&self) -> usize

impl Len for &CStr

fn len(&self) -> usize

impl Len for &Path

fn len(&self) -> usize

impl Len for &PathBuf

fn len(&self) -> usize

impl Len for str

fn len(&self) -> usize

impl Len for CString

fn len(&self) -> usize

impl Len for String

fn len(&self) -> usize

impl Len for CStr

fn len(&self) -> usize

impl Len for PathBuf

fn len(&self) -> usize

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

fn len(&self) -> usize

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

fn len(&self) -> usize

impl<T> Len for &[T]

fn len(&self) -> usize

impl<T> Len for [T]

fn len(&self) -> usize

impl<T> Len for BinaryHeap<T>

fn len(&self) -> usize

impl<T> Len for BTreeSet<T>

fn len(&self) -> usize

impl<T> Len for LinkedList<T>

fn len(&self) -> usize

impl<T> Len for VecDeque<T>

fn len(&self) -> usize

impl<T> Len for Vec<T>

fn len(&self) -> usize

impl<T> Len for HashSet<T>

fn len(&self) -> usize

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

fn len(&self) -> usize

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

fn len(&self) -> usize

impl<T: Len + ?Sized> Len for Box<T>

Available on non-crate feature nostd only.

fn len(&self) -> usize

impl<T: Len + ?Sized> Len for Rc<T>

Available on non-crate feature nostd only.

fn len(&self) -> usize

Implementors