Trait nom::lib::std::ops::Add

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

The addition operator +.

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

Examples

Addable points

use std::ops::Add;

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

impl Add for Point {
    type Output = Self;

    fn add(self, other: Self) -> Self {
        Self {
            x: self.x + other.x,
            y: self.y + other.y,
        }
    }
}

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

Implementing Add with generics

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

use std::ops::Add;

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

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

    fn add(self, other: Self) -> Self::Output {
        Self {
            x: self.x + other.x,
            y: self.y + other.y,
        }
    }
}

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

Associated Types

type Output

The resulting type after applying the + operator.

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Required methods

#[must_use]pub fn add(self, rhs: Rhs) -> Self::Output

Performs the + operation.

Example

assert_eq!(12 + 1, 13);

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Implementations on Foreign Types

impl Add<Duration> for SystemTime

type Output = SystemTime

pub fn add(self, dur: Duration) -> SystemTime

Panics

This function may panic if the resulting point in time cannot be represented by the underlying data structure. See SystemTime::checked_add for a version without panic.

impl Add<Duration> for Instant

type Output = Instant

pub fn add(self, other: Duration) -> Instant

Panics

This function may panic if the resulting point in time cannot be represented by the underlying data structure. See Instant::checked_add for a version without panic.

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

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

pub fn add(
    self,
    other: Wrapping<usize>
) -> <Wrapping<usize> as Add<Wrapping<usize>>>::Output

impl<'_> Add<&'_ i128> for i128

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

pub fn add(self, other: &i128) -> <i128 as Add<i128>>::Output

impl<'_, '_> Add<&'_ Wrapping<usize>> for &'_ Wrapping<usize>

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

pub fn add(
    self,
    other: &Wrapping<usize>
) -> <Wrapping<usize> as Add<Wrapping<usize>>>::Output

impl Add<Wrapping<u64>> for Wrapping<u64>

type Output = Wrapping<u64>

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

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

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

pub fn add(
    self,
    other: Wrapping<u16>
) -> <Wrapping<u16> as Add<Wrapping<u16>>>::Output

impl Add<Wrapping<u128>> for Wrapping<u128>

type Output = Wrapping<u128>

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

impl<'_, '_> Add<&'_ i8> for &'_ i8

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

pub fn add(self, other: &i8) -> <i8 as Add<i8>>::Output

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

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

pub fn add(self, other: i8) -> <i8 as Add<i8>>::Output

impl<'_, '_> Add<&'_ i16> for &'_ i16

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

pub fn add(self, other: &i16) -> <i16 as Add<i16>>::Output

impl Add<f64> for f64

type Output = f64

pub fn add(self, other: f64) -> f64

impl<'_> Add<&'_ f64> for f64

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

pub fn add(self, other: &f64) -> <f64 as Add<f64>>::Output

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

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

pub fn add(
    self,
    other: Wrapping<i128>
) -> <Wrapping<i128> as Add<Wrapping<i128>>>::Output

impl Add<Wrapping<u8>> for Wrapping<u8>

type Output = Wrapping<u8>

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

impl Add<u32> for u32

type Output = u32

pub fn add(self, other: u32) -> u32

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

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

pub fn add(
    self,
    other: Wrapping<u8>
) -> <Wrapping<u8> as Add<Wrapping<u8>>>::Output

impl Add<Duration> for Duration

type Output = Duration

pub fn add(self, rhs: Duration) -> Duration

impl<'_> Add<&'_ f32> for f32

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

pub fn add(self, other: &f32) -> <f32 as Add<f32>>::Output

impl<'_, '_> Add<&'_ usize> for &'_ usize

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

pub fn add(self, other: &usize) -> <usize as Add<usize>>::Output

impl Add<i64> for i64

type Output = i64

pub fn add(self, other: i64) -> i64

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

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

pub fn add(self, other: u64) -> <u64 as Add<u64>>::Output

impl<'_, '_> Add<&'_ Wrapping<u8>> for &'_ Wrapping<u8>

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

pub fn add(
    self,
    other: &Wrapping<u8>
) -> <Wrapping<u8> as Add<Wrapping<u8>>>::Output

impl<'_> Add<&'_ i64> for i64

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

pub fn add(self, other: &i64) -> <i64 as Add<i64>>::Output

impl Add<i16> for i16

type Output = i16

pub fn add(self, other: i16) -> i16

impl<'_> Add<&'_ Wrapping<i128>> for Wrapping<i128>

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

pub fn add(
    self,
    other: &Wrapping<i128>
) -> <Wrapping<i128> as Add<Wrapping<i128>>>::Output

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

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

pub fn add(self, other: f32) -> <f32 as Add<f32>>::Output

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

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

pub fn add(self, other: i32) -> <i32 as Add<i32>>::Output

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

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

pub fn add(self, other: i128) -> <i128 as Add<i128>>::Output

impl<'_> Add<&'_ u8> for u8

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

pub fn add(self, other: &u8) -> <u8 as Add<u8>>::Output

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

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

pub fn add(
    self,
    other: Wrapping<i32>
) -> <Wrapping<i32> as Add<Wrapping<i32>>>::Output

impl<'_> Add<&'_ Wrapping<i64>> for Wrapping<i64>

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

pub fn add(
    self,
    other: &Wrapping<i64>
) -> <Wrapping<i64> as Add<Wrapping<i64>>>::Output

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

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

pub fn add(
    self,
    other: Wrapping<i16>
) -> <Wrapping<i16> as Add<Wrapping<i16>>>::Output

impl Add<u128> for u128

type Output = u128

pub fn add(self, other: u128) -> u128

impl<'_> Add<&'_ usize> for usize

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

pub fn add(self, other: &usize) -> <usize as Add<usize>>::Output

impl Add<i128> for i128

type Output = i128

pub fn add(self, other: i128) -> i128

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

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

pub fn add(self, other: u8) -> <u8 as Add<u8>>::Output

impl<'_, '_> Add<&'_ Wrapping<u32>> for &'_ Wrapping<u32>

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

pub fn add(
    self,
    other: &Wrapping<u32>
) -> <Wrapping<u32> as Add<Wrapping<u32>>>::Output

impl Add<Wrapping<i128>> for Wrapping<i128>

type Output = Wrapping<i128>

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

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

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

pub fn add(self, other: i16) -> <i16 as Add<i16>>::Output

impl Add<u8> for u8

type Output = u8

pub fn add(self, other: u8) -> u8

impl Add<Wrapping<i16>> for Wrapping<i16>

type Output = Wrapping<i16>

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

impl<'_> Add<&'_ u32> for u32

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

pub fn add(self, other: &u32) -> <u32 as Add<u32>>::Output

impl<'_, '_> Add<&'_ i32> for &'_ i32

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

pub fn add(self, other: &i32) -> <i32 as Add<i32>>::Output

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

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

pub fn add(self, other: u16) -> <u16 as Add<u16>>::Output

impl<'_, '_> Add<&'_ u128> for &'_ u128

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

pub fn add(self, other: &u128) -> <u128 as Add<u128>>::Output

impl<'_, '_> Add<&'_ Wrapping<i128>> for &'_ Wrapping<i128>

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

pub fn add(
    self,
    other: &Wrapping<i128>
) -> <Wrapping<i128> as Add<Wrapping<i128>>>::Output

impl<'_, '_> Add<&'_ Wrapping<u64>> for &'_ Wrapping<u64>

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

pub fn add(
    self,
    other: &Wrapping<u64>
) -> <Wrapping<u64> as Add<Wrapping<u64>>>::Output

impl<'_, '_> Add<&'_ u32> for &'_ u32

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

pub fn add(self, other: &u32) -> <u32 as Add<u32>>::Output

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

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

pub fn add(self, other: u32) -> <u32 as Add<u32>>::Output

impl Add<Wrapping<u32>> for Wrapping<u32>

type Output = Wrapping<u32>

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

impl<'_, '_> Add<&'_ u64> for &'_ u64

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

pub fn add(self, other: &u64) -> <u64 as Add<u64>>::Output

impl<'_, '_> Add<&'_ f64> for &'_ f64

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

pub fn add(self, other: &f64) -> <f64 as Add<f64>>::Output

impl<'_> Add<&'_ Wrapping<usize>> for Wrapping<usize>

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

pub fn add(
    self,
    other: &Wrapping<usize>
) -> <Wrapping<usize> as Add<Wrapping<usize>>>::Output

impl<'_> Add<&'_ i16> for i16

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

pub fn add(self, other: &i16) -> <i16 as Add<i16>>::Output

impl Add<isize> for isize

type Output = isize

pub fn add(self, other: isize) -> isize

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

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

pub fn add(
    self,
    other: Wrapping<u32>
) -> <Wrapping<u32> as Add<Wrapping<u32>>>::Output

impl<'_, '_> Add<&'_ Wrapping<i64>> for &'_ Wrapping<i64>

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

pub fn add(
    self,
    other: &Wrapping<i64>
) -> <Wrapping<i64> as Add<Wrapping<i64>>>::Output

impl<'_, '_> Add<&'_ Wrapping<isize>> for &'_ Wrapping<isize>

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

pub fn add(
    self,
    other: &Wrapping<isize>
) -> <Wrapping<isize> as Add<Wrapping<isize>>>::Output

impl<'_> Add<&'_ i32> for i32

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

pub fn add(self, other: &i32) -> <i32 as Add<i32>>::Output

impl<'_> Add<&'_ Wrapping<i16>> for Wrapping<i16>

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

pub fn add(
    self,
    other: &Wrapping<i16>
) -> <Wrapping<i16> as Add<Wrapping<i16>>>::Output

impl<'_, '_> Add<&'_ Wrapping<u16>> for &'_ Wrapping<u16>

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

pub fn add(
    self,
    other: &Wrapping<u16>
) -> <Wrapping<u16> as Add<Wrapping<u16>>>::Output

impl Add<Wrapping<u16>> for Wrapping<u16>

type Output = Wrapping<u16>

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

impl<'_> Add<&'_ u128> for u128

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

pub fn add(self, other: &u128) -> <u128 as Add<u128>>::Output

impl Add<Wrapping<i32>> for Wrapping<i32>

type Output = Wrapping<i32>

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

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

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

pub fn add(
    self,
    other: Wrapping<isize>
) -> <Wrapping<isize> as Add<Wrapping<isize>>>::Output

impl<'_> Add<&'_ Wrapping<i32>> for Wrapping<i32>

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

pub fn add(
    self,
    other: &Wrapping<i32>
) -> <Wrapping<i32> as Add<Wrapping<i32>>>::Output

impl<'_> Add<&'_ Wrapping<u16>> for Wrapping<u16>

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

pub fn add(
    self,
    other: &Wrapping<u16>
) -> <Wrapping<u16> as Add<Wrapping<u16>>>::Output

impl<'_, '_> Add<&'_ Wrapping<i16>> for &'_ Wrapping<i16>

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

pub fn add(
    self,
    other: &Wrapping<i16>
) -> <Wrapping<i16> as Add<Wrapping<i16>>>::Output

impl<'_, '_> Add<&'_ i128> for &'_ i128

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

pub fn add(self, other: &i128) -> <i128 as Add<i128>>::Output

impl Add<u64> for u64

type Output = u64

pub fn add(self, other: u64) -> u64

impl<'_, '_> Add<&'_ u16> for &'_ u16

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

pub fn add(self, other: &u16) -> <u16 as Add<u16>>::Output

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

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

pub fn add(self, other: isize) -> <isize as Add<isize>>::Output

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

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

pub fn add(self, other: i64) -> <i64 as Add<i64>>::Output

impl Add<i32> for i32

type Output = i32

pub fn add(self, other: i32) -> i32

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

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

pub fn add(
    self,
    other: Wrapping<u64>
) -> <Wrapping<u64> as Add<Wrapping<u64>>>::Output

impl<'_, '_> Add<&'_ Wrapping<u128>> for &'_ Wrapping<u128>

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

pub fn add(
    self,
    other: &Wrapping<u128>
) -> <Wrapping<u128> as Add<Wrapping<u128>>>::Output

impl<'_> Add<&'_ Wrapping<u8>> for Wrapping<u8>

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

pub fn add(
    self,
    other: &Wrapping<u8>
) -> <Wrapping<u8> as Add<Wrapping<u8>>>::Output

impl<'_, '_> Add<&'_ isize> for &'_ isize

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

pub fn add(self, other: &isize) -> <isize as Add<isize>>::Output

impl<'_, '_> Add<&'_ Wrapping<i8>> for &'_ Wrapping<i8>

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

pub fn add(
    self,
    other: &Wrapping<i8>
) -> <Wrapping<i8> as Add<Wrapping<i8>>>::Output

impl Add<u16> for u16

type Output = u16

pub fn add(self, other: u16) -> u16

impl Add<Wrapping<i8>> for Wrapping<i8>

type Output = Wrapping<i8>

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

impl<'_> Add<&'_ Wrapping<u64>> for Wrapping<u64>

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

pub fn add(
    self,
    other: &Wrapping<u64>
) -> <Wrapping<u64> as Add<Wrapping<u64>>>::Output

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

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

pub fn add(
    self,
    other: Wrapping<u128>
) -> <Wrapping<u128> as Add<Wrapping<u128>>>::Output

impl Add<Wrapping<usize>> for Wrapping<usize>

type Output = Wrapping<usize>

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

impl<'_> Add<&'_ Wrapping<u32>> for Wrapping<u32>

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

pub fn add(
    self,
    other: &Wrapping<u32>
) -> <Wrapping<u32> as Add<Wrapping<u32>>>::Output

impl<'_, '_> Add<&'_ u8> for &'_ u8

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

pub fn add(self, other: &u8) -> <u8 as Add<u8>>::Output

impl<'_, '_> Add<&'_ Wrapping<i32>> for &'_ Wrapping<i32>

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

pub fn add(
    self,
    other: &Wrapping<i32>
) -> <Wrapping<i32> as Add<Wrapping<i32>>>::Output

impl Add<Wrapping<isize>> for Wrapping<isize>

type Output = Wrapping<isize>

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

impl<'_, '_> Add<&'_ f32> for &'_ f32

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

pub fn add(self, other: &f32) -> <f32 as Add<f32>>::Output

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

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

pub fn add(self, other: f64) -> <f64 as Add<f64>>::Output

impl<'_> Add<&'_ Wrapping<u128>> for Wrapping<u128>

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

pub fn add(
    self,
    other: &Wrapping<u128>
) -> <Wrapping<u128> as Add<Wrapping<u128>>>::Output

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

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

pub fn add(self, other: usize) -> <usize as Add<usize>>::Output

impl<'_> Add<&'_ u64> for u64

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

pub fn add(self, other: &u64) -> <u64 as Add<u64>>::Output

impl Add<i8> for i8

type Output = i8

pub fn add(self, other: i8) -> i8

impl Add<usize> for usize

type Output = usize

pub fn add(self, other: usize) -> usize

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

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

pub fn add(
    self,
    other: Wrapping<i8>
) -> <Wrapping<i8> as Add<Wrapping<i8>>>::Output

impl<'_> Add<&'_ i8> for i8

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

pub fn add(self, other: &i8) -> <i8 as Add<i8>>::Output

impl Add<f32> for f32

type Output = f32

pub fn add(self, other: f32) -> f32

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

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

pub fn add(
    self,
    other: Wrapping<i64>
) -> <Wrapping<i64> as Add<Wrapping<i64>>>::Output

impl<'_> Add<&'_ Wrapping<isize>> for Wrapping<isize>

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

pub fn add(
    self,
    other: &Wrapping<isize>
) -> <Wrapping<isize> as Add<Wrapping<isize>>>::Output

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

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

pub fn add(self, other: u128) -> <u128 as Add<u128>>::Output

impl<'_> Add<&'_ u16> for u16

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

pub fn add(self, other: &u16) -> <u16 as Add<u16>>::Output

impl<'_> Add<&'_ Wrapping<i8>> for Wrapping<i8>

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

pub fn add(
    self,
    other: &Wrapping<i8>
) -> <Wrapping<i8> as Add<Wrapping<i8>>>::Output

impl Add<Wrapping<i64>> for Wrapping<i64>

type Output = Wrapping<i64>

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

impl<'_, '_> Add<&'_ i64> for &'_ i64

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

pub fn add(self, other: &i64) -> <i64 as Add<i64>>::Output

impl<'_> Add<&'_ isize> for isize

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

pub fn add(self, other: &isize) -> <isize as Add<isize>>::Output

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Implementors

impl<'_> Add<&'_ str> for String

Implements the + operator for concatenating two strings.

This consumes the String on the left-hand side and re-uses its buffer (growing it if necessary). This is done to avoid allocating a new String and copying the entire contents on every operation, which would lead to O(n^2) running time when building an n-byte string by repeated concatenation.

The string on the right-hand side is only borrowed; its contents are copied into the returned String.

Examples

Concatenating two Strings takes the first by value and borrows the second:

let a = String::from("hello");
let b = String::from(" world");
let c = a + &b;
// `a` is moved and can no longer be used here.

If you want to keep using the first String, you can clone it and append to the clone instead:

let a = String::from("hello");
let b = String::from(" world");
let c = a.clone() + &b;
// `a` is still valid here.

Concatenating &str slices can be done by converting the first to a String:

let a = "hello";
let b = " world";
let c = a.to_string() + b;

type Output = String

pub fn add(self, other: &str) -> String

impl<'a> Add<&'a str> for Cow<'a, str>

type Output = Cow<'a, str>

pub fn add(self, rhs: &'a str) -> <Cow<'a, str> as Add<&'a str>>::Output

impl<'a> Add<Cow<'a, str>> for Cow<'a, str>

type Output = Cow<'a, str>

pub fn add(
    self,
    rhs: Cow<'a, str>
) -> <Cow<'a, str> as Add<Cow<'a, str>>>::Output

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