Trait nom::lib::std::ops::Sub

#[lang = "sub"]
pub trait Sub<RHS = Self> {
    type Output;
    
#[must_use]
fn sub(self, rhs: RHS) -> Self::Output;
}

The subtraction operator -.

Note that RHS is Self by default, but this is not mandatory. For example, std::time::SystemTime implements Sub<Duration>, which permits operations of the form SystemTime = SystemTime - Duration.

Examples

Subtractable points

use std::ops::Sub;

#[derive(Debug, PartialEq)]
struct Point {
    x: i32,
    y: i32,
}

impl Sub for Point {
    type Output = Point;

    fn sub(self, other: Point) -> Point {
        Point {
            x: self.x - other.x,
            y: self.y - other.y,
        }
    }
}

assert_eq!(Point { x: 3, y: 3 } - Point { x: 2, y: 3 },
           Point { x: 1, y: 0 });

Implementing Sub with generics

Here is an example of the same Point struct implementing the Sub trait using generics.

use std::ops::Sub;

#[derive(Debug, PartialEq)]
struct Point<T> {
    x: T,
    y: T,
}

// Notice that the implementation uses the associated type `Output`.
impl<T: Sub<Output=T>> Sub for Point<T> {
    type Output = Point<T>;

    fn sub(self, other: Point<T>) -> Point<T> {
        Point {
            x: self.x - other.x,
            y: self.y - other.y,
        }
    }
}

assert_eq!(Point { x: 2, y: 3 } - Point { x: 1, y: 0 },
           Point { x: 1, y: 3 });

Associated Types

type Output

The resulting type after applying the - operator.

Required Methods

#[must_use]

fn sub(self, rhs: RHS) -> Self::Output

Performs the - operation.

Implementations on Foreign Types

impl Sub<Duration> for SystemTime

type Output = SystemTime

fn sub(self, dur: Duration) -> SystemTime

impl Sub<Duration> for Instant

type Output = Instant

fn sub(self, other: Duration) -> Instant

impl Sub<Instant> for Instant

type Output = Duration

fn sub(self, other: Instant) -> Duration

impl Sub<Wrapping<u16>> for Wrapping<u16>

type Output = Wrapping<u16>

fn sub(self, other: Wrapping<u16>) -> Wrapping<u16>

impl<'a, 'b> Sub<&'a Wrapping<u32>> for &'b Wrapping<u32>

type Output = <Wrapping<u32> as Sub<Wrapping<u32>>>::Output

fn sub(     self,     other: &'a Wrapping<u32> ) -> <Wrapping<u32> as Sub<Wrapping<u32>>>::Output

impl<'a> Sub<u8> for &'a u8

type Output = <u8 as Sub<u8>>::Output

fn sub(self, other: u8) -> <u8 as Sub<u8>>::Output

impl<'a, 'b> Sub<&'a i64> for &'b i64

type Output = <i64 as Sub<i64>>::Output

fn sub(self, other: &'a i64) -> <i64 as Sub<i64>>::Output

impl<'a> Sub<&'a Wrapping<i128>> for Wrapping<i128>

type Output = <Wrapping<i128> as Sub<Wrapping<i128>>>::Output

fn sub(     self,     other: &'a Wrapping<i128> ) -> <Wrapping<i128> as Sub<Wrapping<i128>>>::Output

impl<'a> Sub<isize> for &'a isize

type Output = <isize as Sub<isize>>::Output

fn sub(self, other: isize) -> <isize as Sub<isize>>::Output

impl<'a> Sub<Wrapping<u8>> for &'a Wrapping<u8>

type Output = <Wrapping<u8> as Sub<Wrapping<u8>>>::Output

fn sub(self, other: Wrapping<u8>) -> <Wrapping<u8> as Sub<Wrapping<u8>>>::Output

impl<'a> Sub<&'a Wrapping<i16>> for Wrapping<i16>

type Output = <Wrapping<i16> as Sub<Wrapping<i16>>>::Output

fn sub(     self,     other: &'a Wrapping<i16> ) -> <Wrapping<i16> as Sub<Wrapping<i16>>>::Output

impl<'a> Sub<Wrapping<i16>> for &'a Wrapping<i16>

type Output = <Wrapping<i16> as Sub<Wrapping<i16>>>::Output

fn sub(     self,     other: Wrapping<i16> ) -> <Wrapping<i16> as Sub<Wrapping<i16>>>::Output

impl Sub<Wrapping<i8>> for Wrapping<i8>

type Output = Wrapping<i8>

fn sub(self, other: Wrapping<i8>) -> Wrapping<i8>

impl<'a> Sub<&'a u32> for u32

type Output = <u32 as Sub<u32>>::Output

fn sub(self, other: &'a u32) -> <u32 as Sub<u32>>::Output

impl<'a> Sub<&'a u128> for u128

type Output = <u128 as Sub<u128>>::Output

fn sub(self, other: &'a u128) -> <u128 as Sub<u128>>::Output

impl<'a, 'b> Sub<&'a Wrapping<u16>> for &'b Wrapping<u16>

type Output = <Wrapping<u16> as Sub<Wrapping<u16>>>::Output

fn sub(     self,     other: &'a Wrapping<u16> ) -> <Wrapping<u16> as Sub<Wrapping<u16>>>::Output

impl<'a, 'b> Sub<&'a Wrapping<i128>> for &'b Wrapping<i128>

type Output = <Wrapping<i128> as Sub<Wrapping<i128>>>::Output

fn sub(     self,     other: &'a Wrapping<i128> ) -> <Wrapping<i128> as Sub<Wrapping<i128>>>::Output

impl Sub<i32> for i32

type Output = i32

fn sub(self, other: i32) -> i32

impl<'a, 'b> Sub<&'a f64> for &'b f64

type Output = <f64 as Sub<f64>>::Output

fn sub(self, other: &'a f64) -> <f64 as Sub<f64>>::Output

impl<'a> Sub<f64> for &'a f64

type Output = <f64 as Sub<f64>>::Output

fn sub(self, other: f64) -> <f64 as Sub<f64>>::Output

impl Sub<Wrapping<u64>> for Wrapping<u64>

type Output = Wrapping<u64>

fn sub(self, other: Wrapping<u64>) -> Wrapping<u64>

impl<'a, 'b> Sub<&'a Wrapping<u8>> for &'b Wrapping<u8>

type Output = <Wrapping<u8> as Sub<Wrapping<u8>>>::Output

fn sub(     self,     other: &'a Wrapping<u8> ) -> <Wrapping<u8> as Sub<Wrapping<u8>>>::Output

impl<'a, 'b> Sub<&'a i32> for &'b i32

type Output = <i32 as Sub<i32>>::Output

fn sub(self, other: &'a i32) -> <i32 as Sub<i32>>::Output

impl Sub<u64> for u64

type Output = u64

fn sub(self, other: u64) -> u64

impl Sub<usize> for usize

type Output = usize

fn sub(self, other: usize) -> usize

impl<'a> Sub<&'a Wrapping<i32>> for Wrapping<i32>

type Output = <Wrapping<i32> as Sub<Wrapping<i32>>>::Output

fn sub(     self,     other: &'a Wrapping<i32> ) -> <Wrapping<i32> as Sub<Wrapping<i32>>>::Output

impl<'a> Sub<&'a Wrapping<u16>> for Wrapping<u16>

type Output = <Wrapping<u16> as Sub<Wrapping<u16>>>::Output

fn sub(     self,     other: &'a Wrapping<u16> ) -> <Wrapping<u16> as Sub<Wrapping<u16>>>::Output

impl<'a> Sub<Wrapping<isize>> for &'a Wrapping<isize>

type Output = <Wrapping<isize> as Sub<Wrapping<isize>>>::Output

fn sub(     self,     other: Wrapping<isize> ) -> <Wrapping<isize> as Sub<Wrapping<isize>>>::Output

impl<'a> Sub<f32> for &'a f32

type Output = <f32 as Sub<f32>>::Output

fn sub(self, other: f32) -> <f32 as Sub<f32>>::Output

impl<'a, 'b> Sub<&'a Wrapping<u128>> for &'b Wrapping<u128>

type Output = <Wrapping<u128> as Sub<Wrapping<u128>>>::Output

fn sub(     self,     other: &'a Wrapping<u128> ) -> <Wrapping<u128> as Sub<Wrapping<u128>>>::Output

impl<'a> Sub<Wrapping<u128>> for &'a Wrapping<u128>

type Output = <Wrapping<u128> as Sub<Wrapping<u128>>>::Output

fn sub(     self,     other: Wrapping<u128> ) -> <Wrapping<u128> as Sub<Wrapping<u128>>>::Output

impl Sub<isize> for isize

type Output = isize

fn sub(self, other: isize) -> isize

impl<'a> Sub<&'a i128> for i128

type Output = <i128 as Sub<i128>>::Output

fn sub(self, other: &'a i128) -> <i128 as Sub<i128>>::Output

impl<'a> Sub<Wrapping<i128>> for &'a Wrapping<i128>

type Output = <Wrapping<i128> as Sub<Wrapping<i128>>>::Output

fn sub(     self,     other: Wrapping<i128> ) -> <Wrapping<i128> as Sub<Wrapping<i128>>>::Output

impl<'a, 'b> Sub<&'a u32> for &'b u32

type Output = <u32 as Sub<u32>>::Output

fn sub(self, other: &'a u32) -> <u32 as Sub<u32>>::Output

impl<'a, 'b> Sub<&'a u16> for &'b u16

type Output = <u16 as Sub<u16>>::Output

fn sub(self, other: &'a u16) -> <u16 as Sub<u16>>::Output

impl Sub<u32> for u32

type Output = u32

fn sub(self, other: u32) -> u32

impl Sub<Wrapping<i128>> for Wrapping<i128>

type Output = Wrapping<i128>

fn sub(self, other: Wrapping<i128>) -> Wrapping<i128>

impl Sub<i64> for i64

type Output = i64

fn sub(self, other: i64) -> i64

impl Sub<f64> for f64

type Output = f64

fn sub(self, other: f64) -> f64

impl<'a> Sub<&'a i8> for i8

type Output = <i8 as Sub<i8>>::Output

fn sub(self, other: &'a i8) -> <i8 as Sub<i8>>::Output

impl<'a> Sub<&'a Wrapping<u32>> for Wrapping<u32>

type Output = <Wrapping<u32> as Sub<Wrapping<u32>>>::Output

fn sub(     self,     other: &'a Wrapping<u32> ) -> <Wrapping<u32> as Sub<Wrapping<u32>>>::Output

impl<'a, 'b> Sub<&'a Wrapping<i16>> for &'b Wrapping<i16>

type Output = <Wrapping<i16> as Sub<Wrapping<i16>>>::Output

fn sub(     self,     other: &'a Wrapping<i16> ) -> <Wrapping<i16> as Sub<Wrapping<i16>>>::Output

impl<'a> Sub<u64> for &'a u64

type Output = <u64 as Sub<u64>>::Output

fn sub(self, other: u64) -> <u64 as Sub<u64>>::Output

impl<'a, 'b> Sub<&'a isize> for &'b isize

type Output = <isize as Sub<isize>>::Output

fn sub(self, other: &'a isize) -> <isize as Sub<isize>>::Output

impl<'a> Sub<&'a u64> for u64

type Output = <u64 as Sub<u64>>::Output

fn sub(self, other: &'a u64) -> <u64 as Sub<u64>>::Output

impl<'a, 'b> Sub<&'a Wrapping<u64>> for &'b Wrapping<u64>

type Output = <Wrapping<u64> as Sub<Wrapping<u64>>>::Output

fn sub(     self,     other: &'a Wrapping<u64> ) -> <Wrapping<u64> as Sub<Wrapping<u64>>>::Output

impl Sub<Wrapping<u8>> for Wrapping<u8>

type Output = Wrapping<u8>

fn sub(self, other: Wrapping<u8>) -> Wrapping<u8>

impl<'a> Sub<&'a Wrapping<usize>> for Wrapping<usize>

type Output = <Wrapping<usize> as Sub<Wrapping<usize>>>::Output

fn sub(     self,     other: &'a Wrapping<usize> ) -> <Wrapping<usize> as Sub<Wrapping<usize>>>::Output

impl Sub<i128> for i128

type Output = i128

fn sub(self, other: i128) -> i128

impl Sub<Wrapping<isize>> for Wrapping<isize>

type Output = Wrapping<isize>

fn sub(self, other: Wrapping<isize>) -> Wrapping<isize>

impl<'a> Sub<Wrapping<i32>> for &'a Wrapping<i32>

type Output = <Wrapping<i32> as Sub<Wrapping<i32>>>::Output

fn sub(     self,     other: Wrapping<i32> ) -> <Wrapping<i32> as Sub<Wrapping<i32>>>::Output

impl<'a> Sub<Wrapping<u64>> for &'a Wrapping<u64>

type Output = <Wrapping<u64> as Sub<Wrapping<u64>>>::Output

fn sub(     self,     other: Wrapping<u64> ) -> <Wrapping<u64> as Sub<Wrapping<u64>>>::Output

impl<'a, 'b> Sub<&'a u8> for &'b u8

type Output = <u8 as Sub<u8>>::Output

fn sub(self, other: &'a u8) -> <u8 as Sub<u8>>::Output

impl<'a> Sub<&'a u8> for u8

type Output = <u8 as Sub<u8>>::Output

fn sub(self, other: &'a u8) -> <u8 as Sub<u8>>::Output

impl<'a> Sub<Wrapping<i8>> for &'a Wrapping<i8>

type Output = <Wrapping<i8> as Sub<Wrapping<i8>>>::Output

fn sub(self, other: Wrapping<i8>) -> <Wrapping<i8> as Sub<Wrapping<i8>>>::Output

impl Sub<Wrapping<i16>> for Wrapping<i16>

type Output = Wrapping<i16>

fn sub(self, other: Wrapping<i16>) -> Wrapping<i16>

impl Sub<i8> for i8

type Output = i8

fn sub(self, other: i8) -> i8

impl<'a> Sub<&'a f32> for f32

type Output = <f32 as Sub<f32>>::Output

fn sub(self, other: &'a f32) -> <f32 as Sub<f32>>::Output

impl Sub<u8> for u8

type Output = u8

fn sub(self, other: u8) -> u8

impl<'a, 'b> Sub<&'a i128> for &'b i128

type Output = <i128 as Sub<i128>>::Output

fn sub(self, other: &'a i128) -> <i128 as Sub<i128>>::Output

impl Sub<u128> for u128

type Output = u128

fn sub(self, other: u128) -> u128

impl<'a> Sub<&'a f64> for f64

type Output = <f64 as Sub<f64>>::Output

fn sub(self, other: &'a f64) -> <f64 as Sub<f64>>::Output

impl<'a> Sub<i64> for &'a i64

type Output = <i64 as Sub<i64>>::Output

fn sub(self, other: i64) -> <i64 as Sub<i64>>::Output

impl<'a> Sub<usize> for &'a usize

type Output = <usize as Sub<usize>>::Output

fn sub(self, other: usize) -> <usize as Sub<usize>>::Output

impl<'a, 'b> Sub<&'a Wrapping<i64>> for &'b Wrapping<i64>

type Output = <Wrapping<i64> as Sub<Wrapping<i64>>>::Output

fn sub(     self,     other: &'a Wrapping<i64> ) -> <Wrapping<i64> as Sub<Wrapping<i64>>>::Output

impl<'a, 'b> Sub<&'a usize> for &'b usize

type Output = <usize as Sub<usize>>::Output

fn sub(self, other: &'a usize) -> <usize as Sub<usize>>::Output

impl<'a> Sub<&'a i64> for i64

type Output = <i64 as Sub<i64>>::Output

fn sub(self, other: &'a i64) -> <i64 as Sub<i64>>::Output

impl<'a, 'b> Sub<&'a Wrapping<i32>> for &'b Wrapping<i32>

type Output = <Wrapping<i32> as Sub<Wrapping<i32>>>::Output

fn sub(     self,     other: &'a Wrapping<i32> ) -> <Wrapping<i32> as Sub<Wrapping<i32>>>::Output

impl Sub<f32> for f32

type Output = f32

fn sub(self, other: f32) -> f32

impl<'a> Sub<i128> for &'a i128

type Output = <i128 as Sub<i128>>::Output

fn sub(self, other: i128) -> <i128 as Sub<i128>>::Output

impl<'a> Sub<&'a Wrapping<i8>> for Wrapping<i8>

type Output = <Wrapping<i8> as Sub<Wrapping<i8>>>::Output

fn sub(     self,     other: &'a Wrapping<i8> ) -> <Wrapping<i8> as Sub<Wrapping<i8>>>::Output

impl<'a> Sub<Wrapping<u16>> for &'a Wrapping<u16>

type Output = <Wrapping<u16> as Sub<Wrapping<u16>>>::Output

fn sub(     self,     other: Wrapping<u16> ) -> <Wrapping<u16> as Sub<Wrapping<u16>>>::Output

impl Sub<u16> for u16

type Output = u16

fn sub(self, other: u16) -> u16

impl<'a> Sub<i16> for &'a i16

type Output = <i16 as Sub<i16>>::Output

fn sub(self, other: i16) -> <i16 as Sub<i16>>::Output

impl<'a, 'b> Sub<&'a f32> for &'b f32

type Output = <f32 as Sub<f32>>::Output

fn sub(self, other: &'a f32) -> <f32 as Sub<f32>>::Output

impl<'a> Sub<&'a isize> for isize

type Output = <isize as Sub<isize>>::Output

fn sub(self, other: &'a isize) -> <isize as Sub<isize>>::Output

impl<'a> Sub<&'a Wrapping<u8>> for Wrapping<u8>

type Output = <Wrapping<u8> as Sub<Wrapping<u8>>>::Output

fn sub(     self,     other: &'a Wrapping<u8> ) -> <Wrapping<u8> as Sub<Wrapping<u8>>>::Output

impl<'a> Sub<&'a Wrapping<u64>> for Wrapping<u64>

type Output = <Wrapping<u64> as Sub<Wrapping<u64>>>::Output

fn sub(     self,     other: &'a Wrapping<u64> ) -> <Wrapping<u64> as Sub<Wrapping<u64>>>::Output

impl<'a, 'b> Sub<&'a Wrapping<isize>> for &'b Wrapping<isize>

type Output = <Wrapping<isize> as Sub<Wrapping<isize>>>::Output

fn sub(     self,     other: &'a Wrapping<isize> ) -> <Wrapping<isize> as Sub<Wrapping<isize>>>::Output

impl<'a, 'b> Sub<&'a i8> for &'b i8

type Output = <i8 as Sub<i8>>::Output

fn sub(self, other: &'a i8) -> <i8 as Sub<i8>>::Output

impl<'a> Sub<&'a usize> for usize

type Output = <usize as Sub<usize>>::Output

fn sub(self, other: &'a usize) -> <usize as Sub<usize>>::Output

impl<'a> Sub<i8> for &'a i8

type Output = <i8 as Sub<i8>>::Output

fn sub(self, other: i8) -> <i8 as Sub<i8>>::Output

impl<'a, 'b> Sub<&'a Wrapping<i8>> for &'b Wrapping<i8>

type Output = <Wrapping<i8> as Sub<Wrapping<i8>>>::Output

fn sub(     self,     other: &'a Wrapping<i8> ) -> <Wrapping<i8> as Sub<Wrapping<i8>>>::Output

impl Sub<Wrapping<usize>> for Wrapping<usize>

type Output = Wrapping<usize>

fn sub(self, other: Wrapping<usize>) -> Wrapping<usize>

impl<'a> Sub<&'a i32> for i32

type Output = <i32 as Sub<i32>>::Output

fn sub(self, other: &'a i32) -> <i32 as Sub<i32>>::Output

impl<'a, 'b> Sub<&'a i16> for &'b i16

type Output = <i16 as Sub<i16>>::Output

fn sub(self, other: &'a i16) -> <i16 as Sub<i16>>::Output

impl Sub<i16> for i16

type Output = i16

fn sub(self, other: i16) -> i16

impl<'a> Sub<&'a Wrapping<isize>> for Wrapping<isize>

type Output = <Wrapping<isize> as Sub<Wrapping<isize>>>::Output

fn sub(     self,     other: &'a Wrapping<isize> ) -> <Wrapping<isize> as Sub<Wrapping<isize>>>::Output

impl<'a> Sub<&'a i16> for i16

type Output = <i16 as Sub<i16>>::Output

fn sub(self, other: &'a i16) -> <i16 as Sub<i16>>::Output

impl<'a, 'b> Sub<&'a u128> for &'b u128

type Output = <u128 as Sub<u128>>::Output

fn sub(self, other: &'a u128) -> <u128 as Sub<u128>>::Output

impl<'a, 'b> Sub<&'a Wrapping<usize>> for &'b Wrapping<usize>

type Output = <Wrapping<usize> as Sub<Wrapping<usize>>>::Output

fn sub(     self,     other: &'a Wrapping<usize> ) -> <Wrapping<usize> as Sub<Wrapping<usize>>>::Output

impl Sub<Wrapping<i32>> for Wrapping<i32>

type Output = Wrapping<i32>

fn sub(self, other: Wrapping<i32>) -> Wrapping<i32>

impl<'a> Sub<&'a Wrapping<u128>> for Wrapping<u128>

type Output = <Wrapping<u128> as Sub<Wrapping<u128>>>::Output

fn sub(     self,     other: &'a Wrapping<u128> ) -> <Wrapping<u128> as Sub<Wrapping<u128>>>::Output

impl Sub<Wrapping<i64>> for Wrapping<i64>

type Output = Wrapping<i64>

fn sub(self, other: Wrapping<i64>) -> Wrapping<i64>

impl<'a> Sub<Wrapping<u32>> for &'a Wrapping<u32>

type Output = <Wrapping<u32> as Sub<Wrapping<u32>>>::Output

fn sub(     self,     other: Wrapping<u32> ) -> <Wrapping<u32> as Sub<Wrapping<u32>>>::Output

impl<'a> Sub<Wrapping<usize>> for &'a Wrapping<usize>

type Output = <Wrapping<usize> as Sub<Wrapping<usize>>>::Output

fn sub(     self,     other: Wrapping<usize> ) -> <Wrapping<usize> as Sub<Wrapping<usize>>>::Output

impl<'a> Sub<Wrapping<i64>> for &'a Wrapping<i64>

type Output = <Wrapping<i64> as Sub<Wrapping<i64>>>::Output

fn sub(     self,     other: Wrapping<i64> ) -> <Wrapping<i64> as Sub<Wrapping<i64>>>::Output

impl Sub<Wrapping<u128>> for Wrapping<u128>

type Output = Wrapping<u128>

fn sub(self, other: Wrapping<u128>) -> Wrapping<u128>

impl Sub<Wrapping<u32>> for Wrapping<u32>

type Output = Wrapping<u32>

fn sub(self, other: Wrapping<u32>) -> Wrapping<u32>

impl<'a> Sub<u128> for &'a u128

type Output = <u128 as Sub<u128>>::Output

fn sub(self, other: u128) -> <u128 as Sub<u128>>::Output

impl<'a> Sub<i32> for &'a i32

type Output = <i32 as Sub<i32>>::Output

fn sub(self, other: i32) -> <i32 as Sub<i32>>::Output

impl<'a, 'b> Sub<&'a u64> for &'b u64

type Output = <u64 as Sub<u64>>::Output

fn sub(self, other: &'a u64) -> <u64 as Sub<u64>>::Output

impl<'a> Sub<u32> for &'a u32

type Output = <u32 as Sub<u32>>::Output

fn sub(self, other: u32) -> <u32 as Sub<u32>>::Output

impl<'a> Sub<&'a Wrapping<i64>> for Wrapping<i64>

type Output = <Wrapping<i64> as Sub<Wrapping<i64>>>::Output

fn sub(     self,     other: &'a Wrapping<i64> ) -> <Wrapping<i64> as Sub<Wrapping<i64>>>::Output

impl Sub<Duration> for Duration

type Output = Duration

fn sub(self, rhs: Duration) -> Duration

impl<'a> Sub<u16> for &'a u16

type Output = <u16 as Sub<u16>>::Output

fn sub(self, other: u16) -> <u16 as Sub<u16>>::Output

impl<'a> Sub<&'a u16> for u16

type Output = <u16 as Sub<u16>>::Output

fn sub(self, other: &'a u16) -> <u16 as Sub<u16>>::Output

Implementors

impl<'a, 'b, T> Sub<&'b BTreeSet<T>> for &'a BTreeSet<T> where     T: Ord + Clone,

type Output = BTreeSet<T>

fn sub(self, rhs: &BTreeSet<T>) -> BTreeSet<T>

Returns the difference of self and rhs as a new BTreeSet<T>.

Examples

use std::collections::BTreeSet;

let a: BTreeSet<_> = vec![1, 2, 3].into_iter().collect();
let b: BTreeSet<_> = vec![3, 4, 5].into_iter().collect();

let result = &a - &b;
let result_vec: Vec<_> = result.into_iter().collect();
assert_eq!(result_vec, [1, 2]);

impl<'a, 'b, T, S> Sub<&'b HashSet<T, S>> for &'a HashSet<T, S> where     S: BuildHasher + Default,     T: Eq + Hash + Clone,

type Output = HashSet<T, S>

fn sub(self, rhs: &HashSet<T, S>) -> HashSet<T, S>

Returns the difference of self and rhs as a new HashSet<T, S>.

Examples

use std::collections::HashSet;

let a: HashSet<_> = vec![1, 2, 3].into_iter().collect();
let b: HashSet<_> = vec![3, 4, 5].into_iter().collect();

let set = &a - &b;

let mut i = 0;
let expected = [1, 2];
for x in &set {
    assert!(expected.contains(x));
    i += 1;
}
assert_eq!(i, expected.len());