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Trait std::ops::Add ​

加法运算符 +。

rust
pub trait Add<Rhs = Self> {
    type Output;

    // Required method
    fn add(self, rhs: Rhs) -> Self::Output;
}

请注意，默认情况下 Rhs 是 Self类型，但这不是强制性的。 例如，std::time::SystemTime 实现 Add<Duration>，它允许以 SystemTime = SystemTime + Duration 形式进行操作。

Point结构体的相加

rust
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 });

使用泛型实现 Add

这是使用泛型实现 Add trait 的同一 Point 结构体的示例。

rust
use std::ops::Add;

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

// 请注意，该实现使用关联类型 `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 });

Required Associated Types ​

Output ​

应用 + 运算符后的结果类型。

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type Output

Required Methods ​

add ​

执行 + 操作。

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fn add(self, rhs: Rhs) -> Self::Output

参数：

  • rhs：相加的右值

返回值：返回相加的结果

rust
assert_eq!(12 + 1, 13);

Implementors ​

&f32 ​

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impl Add<&f32> for &f32

f32 ​

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impl Add<&f32> for f32

&f64 ​

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impl Add<&f64> for &f64

&i8 ​

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impl Add<&f64> for &i8

&i8 ​

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impl Add<&i8> for &i8

i8 ​

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impl Add<&i8> for i8

&i16 ​

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impl Add<&i16> for &i16

i16 ​

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impl Add<&i16> for i16

&i32 ​

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impl Add<&i32> for &i32

i32 ​

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impl Add<&i32> for i32

&i64 ​

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impl Add<&i64> for &i64

i64 ​

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impl Add<&i64> for i64

&i128 ​

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impl Add<&i128> for &i128

i128 ​

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impl Add<&i128> for i128

&isize ​

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impl Add<&isize> for &isize

isize ​

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impl Add<&isize> for isize

String ​

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impl Add<&str> for String

实现 + 运算符以连接两个字符串。

这会消费左侧的 String，并重新使用其缓冲区 (如有必要，请增加缓冲区)。 这样做是为了避免分配新的 String 并在每个操作上复制整个内容，当通过重复连接构建 n 字节的字符串时，这将导致 O(n^ 2) 运行时间。

右侧的字符串仅是借用的。它的内容被复制到返回的 String 中。

将两个 String 连接起来，第一个按值取值，第二个借用：

rust
let a = String::from("hello");
let b = String::from(" world");
let c = a + &b;
// `a` 已移动，不能再在此处使用。

如果要继续使用第一个 String，则可以对其进行克隆并追加到克隆中：

rust
let a = String::from("hello");
let b = String::from(" world");
let c = a.clone() + &b;
// `a` 在这里仍然有效。

可以通过将第一个切片转换为 String 来完成 &str 切片的连接：

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

&u8 ​

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impl Add<&u8> for &u8

u8 ​

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impl Add<&u8> for u8

&u16 ​

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impl Add<&u16> for &u16

u16 ​

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impl Add<&u16> for u16

&u32 ​

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impl Add<&u32> for &u32

u32 ​

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impl Add<&u32> for u32

&u64 ​

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impl Add<&u64> for &u64

u64 ​

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impl Add<&u64> for u64

&u128 ​

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impl Add<&u128> for &u128

u128 ​

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impl Add<&u128> for u128

&usize ​

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impl Add<&usize> for &usize

usize ​

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impl Add<&usize> for usize

&Saturating<i8> ​

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impl Add<&Saturating<i8>> for &Saturating<i8>

Saturating<i8> ​

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impl Add<&Saturating<i8>> for Saturating<i8>

&Saturating<i16> ​

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impl Add<&Saturating<i16>> for &Saturating<i16>

Saturating<i16> ​

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impl Add<&Saturating<i16>> for Saturating<i16>

&Saturating<i32> ​

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impl Add<&Saturating<i32>> for &Saturating<i32>

Saturating<i32> ​

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impl Add<&Saturating<i32>> for Saturating<i32>

&Saturating<i64> ​

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impl Add<&Saturating<i64>> for &Saturating<i64>

Saturating<i64> ​

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impl Add<&Saturating<i64>> for Saturating<i64>

&Saturating<i128> ​

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impl Add<&Saturating<i128>> for &Saturating<i128>

Saturating<i128> ​

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impl Add<&Saturating<i128>> for Saturating<i128>

&Saturating<isize> ​

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impl Add<&Saturating<isize>> for &Saturating<isize>

Saturating<isize> ​

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impl Add<&Saturating<isize>> for Saturating<isize>

&Saturating<u8> ​

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impl Add<&Saturating<u8>> for &Saturating<u8>

Saturating<u8> ​

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impl Add<&Saturating<u8>> for Saturating<u8>

&Saturating<u16> ​

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impl Add<&Saturating<u16>> for &Saturating<u16>

Saturating<u16> ​

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impl Add<&Saturating<u16>> for Saturating<u16>

&Saturating<u32> ​

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impl Add<&Saturating<u32>> for &Saturating<u32>

Saturating<u32> ​

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impl Add<&Saturating<u32>> for Saturating<u32>

&Saturating<u64> ​

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impl Add<&Saturating<u64>> for &Saturating<u64>

Saturating<u64> ​

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impl Add<&Saturating<u64>> for Saturating<u64>

&Saturating<u128> ​

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impl Add<&Saturating<u128>> for &Saturating<u128>

Saturating<u128> ​

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impl Add<&Saturating<u128>> for Saturating<u128>

&Saturating<usize> ​

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impl Add<&Saturating<usize>> for &Saturating<usize>

Saturating<usize> ​

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impl Add<&Saturating<usize>> for Saturating<usize>

&Wrapping<i8> ​

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

Wrapping<i8> ​

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

&Wrapping<i16> ​

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

Wrapping<i16> ​

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

&Wrapping<i32> ​

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

Wrapping<i32> ​

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

&Wrapping<i64> ​

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

Wrapping<i64> ​

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

&Wrapping<i128> ​

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

Wrapping<i128> ​

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

&Wrapping<isize> ​

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

Wrapping<isize> ​

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

&Wrapping<u8> ​

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

Wrapping<u8> ​

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

&Wrapping<u16> ​

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

Wrapping<u16> ​

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

&Wrapping<u32> ​

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

Wrapping<u32> ​

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

&Wrapping<u64> ​

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

Wrapping<u64> ​

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

&Wrapping<u128> ​

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

Wrapping<u128> ​

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

&Wrapping<usize> ​

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

Wrapping<usize> ​

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

f32 ​

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impl Add<f32> for f32

f64

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impl Add<f64> for f64

i8 ​

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impl Add<i8> for i8

i16 ​

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impl Add<i16> for i16

i32 ​

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impl Add<i32> for i32

i64 ​

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impl Add<i64> for i64

i128 ​

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impl Add<i128> for i128

isize ​

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impl Add<isize> for isize

u8 ​

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impl Add<u8> for u8

u16 ​

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impl Add<u16> for u16

u32 ​

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impl Add<u32> for u32

u64 ​

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impl Add<u64> for u64

u128 ​

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impl Add<u128> for u128

usize ​

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impl Add<usize> for usize

Assume ​

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impl Add<Assume> for Assume

Saturating<i8> ​

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impl Add<Saturating<i8>> for Saturating<i8>

Saturating<i16> ​

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impl Add<Saturating<i16>> for Saturating<i16>

Saturating<i32> ​

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impl Add<Saturating<i32>> for Saturating<i32>

Saturating<i64> ​

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impl Add<Saturating<i64>> for Saturating<i64>

Saturating<i128> ​

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impl Add<Saturating<i128>> for Saturating<i128>

Saturating<isize> ​

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impl Add<Saturating<isize>> for Saturating<isize>

Saturating<u8> ​

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impl Add<Saturating<u8>> for Saturating<u8>

Saturating<u16> ​

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impl Add<Saturating<u16>> for Saturating<u16>

Saturating<u32> ​

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impl Add<Saturating<u32>> for Saturating<u32>

Saturating<u64> ​

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impl Add<Saturating<u64>> for Saturating<u64>

Saturating<u128> ​

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impl Add<Saturating<u128>> for Saturating<u128>

Saturating<usize> ​

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impl Add<Saturating<usize>> for Saturating<usize>

Wrapping<i8> ​

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

Wrapping<i16> ​

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

Wrapping<i32> ​

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

Wrapping<i64> ​

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

Wrapping<i128> ​

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

Wrapping<isize> ​

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

Wrapping<u8> ​

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

Wrapping<u16> ​

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

Wrapping<u32> ​

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

Wrapping<u64> ​

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

Wrapping<u128> ​

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

Wrapping<usize> ​

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

Duration ​

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impl Add<Duration> for Duration

Instant ​

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impl Add<Duration> for Instant

SystemTime ​

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impl Add<Duration> for SystemTime

Cow<'a, str> ​

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

Cow<'a, str> ​

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

&'a f32 ​

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

&'a f64 ​

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

&'a i8 ​

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

&'a i16 ​

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

&'a i32 ​

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

&'a i64 ​

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

&'a i128 ​

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

&'a isize ​

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

&'a u8 ​

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

&'a u16 ​

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

&'a u32 ​

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

&'a u64 ​

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

&'a u128 ​

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

&'a usize ​

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

&'a Saturating<i8> ​

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

&'a Saturating<i16> ​

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

&'a Saturating<i32> ​

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

Output ​

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

&'a Saturating<i64> ​

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

&'a Saturating<i128> ​

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

&'a Saturating<isize> ​

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

&'a Saturating<u8> ​

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

&'a Saturating<u16> ​

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

&'a Saturating<u32> ​

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

&'a Saturating<u64> ​

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

&'a Saturating<u128> ​

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

&'a Saturating<usize> ​

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

&'a Wrapping<i8> ​

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

&'a Wrapping<i16> ​

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

&'a Wrapping<i32> ​

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

&'a Wrapping<i64> ​

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

&'a Wrapping<i128> ​

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

&'a Wrapping<isize> ​

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

&'a Wrapping<u8> ​

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

&'a Wrapping<u16> ​

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

&'a Wrapping<u32> ​

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

&'a Wrapping<u64> ​

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

&'a Wrapping<u128> ​

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

&'a Wrapping<usize> ​

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

&'lhs Simd<T, LANES> ​

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impl<'lhs, 'rhs, T, const LANES: usize> Add<&'rhs Simd<T, LANES>> for &'lhs Simd<T, LANES>
where
  T: SimdElement,
  Simd<T, LANES>: Add<Simd<T, LANES>, Output = Simd<T, LANES>>,
  LaneCount<LANES>: SupportedLaneCount,

Simd<T, LANES> ​

rust
impl<T, const LANES: usize> Add<&Simd<T, LANES>> for Simd<T, LANES>
where
  T: SimdElement,
  Simd<T, LANES>: Add<Simd<T, LANES>, Output = Simd<T, LANES>>,
  LaneCount<LANES>: SupportedLaneCount,

&Simd<T, LANES> ​

rust
impl<T, const LANES: usize> Add<Simd<T, LANES>> for &Simd<T, LANES>
where
  T: SimdElement,
  Simd<T, LANES>: Add<Simd<T, LANES>, Output = Simd<T, LANES>>,
  LaneCount<LANES>: SupportedLaneCount,

Simd<f32, N> ​

rust
impl<const N: usize> Add<Simd<f32, N>> for Simd<f32, N>
where
  f32: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<f64, N> ​

rust
impl<const N: usize> Add<Simd<f64, N>> for Simd<f64, N>
where
  f64: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<i8, N> ​

rust
impl<const N: usize> Add<Simd<i8, N>> for Simd<i8, N>
where
  i8: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<i16, N> ​

rust
impl<const N: usize> Add<Simd<i16, N>> for Simd<i16, N>
where
  i16: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<i32, N> ​

rust
impl<const N: usize> Add<Simd<i32, N>> for Simd<i32, N>
where
  i32: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<i64, N> ​

rust
impl<const N: usize> Add<Simd<i64, N>> for Simd<i64, N>
where
  i64: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<isize, N> ​

rust
impl<const N: usize> Add<Simd<isize, N>> for Simd<isize, N>
where
  isize: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<u8, N> ​

rust
impl<const N: usize> Add<Simd<u8, N>> for Simd<u8, N>
where
  u8: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<u16, N> ​

rust
impl<const N: usize> Add<Simd<u16, N>> for Simd<u16, N>
where
  u16: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<u32, N> ​

rust
impl<const N: usize> Add<Simd<u32, N>> for Simd<u32, N>
where
  u32: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<u64, N> ​

rust
impl<const N: usize> Add<Simd<u64, N>> for Simd<u64, N>
where
  u64: SimdElement,
  LaneCount<N>: SupportedLaneCount,

Simd<usize, N> ​

rust
impl<const N: usize> Add<Simd<usize, N>> for Simd<usize, N>
where
  usize: SimdElement,
  LaneCount<N>: SupportedLaneCount,

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