Struct darling::util::IdentList

pub struct IdentList(_);

A list of syn::Ident instances. This type is used to extract a list of words from an attribute.

Usage

An IdentList field on a struct implementing FromMetaItem will turn #[builder(derive(Debug, Clone))] into:

StructOptions {
    derive: IdentList(vec![syn::Ident::new("Debug"), syn::Ident::new("Clone")])
}

Methods

impl IdentList

fn new<T>(vals: Vec<T>) -> IdentList where
    T: Into<Ident>, 

Create a new list.

fn as_strs(&'a self) -> Vec<&'a str>

Creates a view of the contained identifiers as &strs.

Methods from Deref<Target = Vec<Ident>>

fn capacity(&self) -> usize

Returns the number of elements the vector can hold without reallocating.

Examples

let vec: Vec<i32> = Vec::with_capacity(10);
assert_eq!(vec.capacity(), 10);

fn into_boxed_slice(self) -> Box<[T]>

Converts the vector into Box<[T]>.

Note that this will drop any excess capacity. Calling this and converting back to a vector with into_vec is equivalent to calling shrink_to_fit.

Examples

let v = vec![1, 2, 3];

let slice = v.into_boxed_slice();

Any excess capacity is removed:

let mut vec = Vec::with_capacity(10);
vec.extend([1, 2, 3].iter().cloned());

assert_eq!(vec.capacity(), 10);
let slice = vec.into_boxed_slice();
assert_eq!(slice.into_vec().capacity(), 3);

fn as_slice(&self) -> &[T]

Extracts a slice containing the entire vector.

Equivalent to &s[..].

Examples

use std::io::{self, Write};
let buffer = vec![1, 2, 3, 5, 8];
io::sink().write(buffer.as_slice()).unwrap();

fn len(&self) -> usize

Returns the number of elements in the vector, also referred to as its 'length'.

Examples

let a = vec![1, 2, 3];
assert_eq!(a.len(), 3);

fn is_empty(&self) -> bool

Returns true if the vector contains no elements.

Examples

let mut v = Vec::new();
assert!(v.is_empty());

v.push(1);
assert!(!v.is_empty());

Trait Implementations

impl Debug for IdentList

fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>

impl Default for IdentList

fn default() -> IdentList

Returns the "default value" for a type.

impl From<Vec<Ident>> for IdentList

fn from(v: Vec<Ident>) -> IdentList

Performs the conversion.

impl Deref for IdentList

type Target = Vec<Ident>

fn deref(&self) -> &<IdentList as Deref>::Target

impl FromMetaItem for IdentList

fn from_list(v: &[NestedMetaItem]) -> Result<IdentList, Error>

Create an instance from a list of nested meta items.

fn from_nested_meta_item(item: &NestedMetaItem) -> Result<Self, Error>

fn from_meta_item(item: &MetaItem) -> Result<Self, Error>

Create an instance from a syn::MetaItem by dispatching to the format-appropriate trait function. This generally should not be overridden by implementers.

fn from_word() -> Result<Self, Error>

Create an instance from the presence of the word in the attribute with no additional options specified.

fn from_value(value: &Lit) -> Result<Self, Error>

Create an instance from a literal value of either foo = "bar" or foo("bar"). This dispatches to the appropriate method based on the type of literal encountered, and generally should not be overridden by implementers.

fn from_char(value: char) -> Result<Self, Error>

Create an instance from a char literal in a value position.

fn from_string(value: &str) -> Result<Self, Error>

Create an instance from a string literal in a value position.

fn from_bool(value: bool) -> Result<Self, Error>

Create an instance from a bool literal in a value position.

impl Eq for IdentList

impl PartialEq<IdentList> for IdentList

fn eq(&self, __arg_0: &IdentList) -> bool

fn ne(&self, __arg_0: &IdentList) -> bool

impl Clone for IdentList

fn clone(&self) -> IdentList