Trait nom::lib::std::iter::Sum

[+] Show declaration

pub trait Sum<A = Self> {
    fn sum<I>(iter: I) -> Self
    where
        I: Iterator<Item = A>;
}

[−] Expand description

Trait to represent types that can be created by summing up an iterator.

This trait is used to implement the sum() method on iterators. Types which implement the trait can be generated by the sum() method. Like FromIterator this trait should rarely be called directly and instead interacted with through Iterator::sum().

Required methods

fn sum<I>(iter: I) -> Self where
    I: Iterator<Item = A>, [−]

Method which takes an iterator and generates Self from the elements by "summing up" the items.

Implementations on Foreign Types

impl Sum<Wrapping<u64>> for Wrapping<u64>[−]

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fn sum<I>(iter: I) -> Wrapping<u64> where
    I: Iterator<Item = Wrapping<u64>>, 

impl Sum<u32> for u32[−]

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fn sum<I>(iter: I) -> u32 where
    I: Iterator<Item = u32>, 

impl<'a> Sum<&'a u32> for u32[−]

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fn sum<I>(iter: I) -> u32 where
    I: Iterator<Item = &'a u32>, 

impl Sum<f32> for f32[−]

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fn sum<I>(iter: I) -> f32 where
    I: Iterator<Item = f32>, 

impl Sum<i16> for i16[−]

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fn sum<I>(iter: I) -> i16 where
    I: Iterator<Item = i16>, 

impl<'a> Sum<&'a Wrapping<i64>> for Wrapping<i64>[−]

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fn sum<I>(iter: I) -> Wrapping<i64> where
    I: Iterator<Item = &'a Wrapping<i64>>, 

impl Sum<Wrapping<usize>> for Wrapping<usize>[−]

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fn sum<I>(iter: I) -> Wrapping<usize> where
    I: Iterator<Item = Wrapping<usize>>, 

impl<'a> Sum<&'a Wrapping<isize>> for Wrapping<isize>[−]

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fn sum<I>(iter: I) -> Wrapping<isize> where
    I: Iterator<Item = &'a Wrapping<isize>>, 

impl Sum<i32> for i32[−]

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fn sum<I>(iter: I) -> i32 where
    I: Iterator<Item = i32>, 

impl<'a> Sum<&'a i32> for i32[−]

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fn sum<I>(iter: I) -> i32 where
    I: Iterator<Item = &'a i32>, 

impl Sum<i128> for i128[−]

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fn sum<I>(iter: I) -> i128 where
    I: Iterator<Item = i128>, 

impl<'a> Sum<&'a f64> for f64[−]

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fn sum<I>(iter: I) -> f64 where
    I: Iterator<Item = &'a f64>, 

impl Sum<Wrapping<u32>> for Wrapping<u32>[−]

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fn sum<I>(iter: I) -> Wrapping<u32> where
    I: Iterator<Item = Wrapping<u32>>, 

impl Sum<u128> for u128[−]

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fn sum<I>(iter: I) -> u128 where
    I: Iterator<Item = u128>, 

impl Sum<Wrapping<u16>> for Wrapping<u16>[−]

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fn sum<I>(iter: I) -> Wrapping<u16> where
    I: Iterator<Item = Wrapping<u16>>, 

impl<'a> Sum<&'a i16> for i16[−]

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fn sum<I>(iter: I) -> i16 where
    I: Iterator<Item = &'a i16>, 

impl<'a> Sum<&'a u64> for u64[−]

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fn sum<I>(iter: I) -> u64 where
    I: Iterator<Item = &'a u64>, 

impl<'a> Sum<&'a usize> for usize[−]

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fn sum<I>(iter: I) -> usize where
    I: Iterator<Item = &'a usize>, 

impl<'a> Sum<&'a u16> for u16[−]

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fn sum<I>(iter: I) -> u16 where
    I: Iterator<Item = &'a u16>, 

impl Sum<Wrapping<isize>> for Wrapping<isize>[−]

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fn sum<I>(iter: I) -> Wrapping<isize> where
    I: Iterator<Item = Wrapping<isize>>, 

impl<'a> Sum<&'a Wrapping<i16>> for Wrapping<i16>[−]

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fn sum<I>(iter: I) -> Wrapping<i16> where
    I: Iterator<Item = &'a Wrapping<i16>>, 

impl Sum<Wrapping<u128>> for Wrapping<u128>[−]

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fn sum<I>(iter: I) -> Wrapping<u128> where
    I: Iterator<Item = Wrapping<u128>>, 

impl<'a> Sum<&'a isize> for isize[−]

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fn sum<I>(iter: I) -> isize where
    I: Iterator<Item = &'a isize>, 

impl Sum<u8> for u8[−]

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fn sum<I>(iter: I) -> u8 where
    I: Iterator<Item = u8>, 

impl<'a> Sum<&'a i128> for i128[−]

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fn sum<I>(iter: I) -> i128 where
    I: Iterator<Item = &'a i128>, 

impl<'a> Sum<&'a Wrapping<i8>> for Wrapping<i8>[−]

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fn sum<I>(iter: I) -> Wrapping<i8> where
    I: Iterator<Item = &'a Wrapping<i8>>, 

impl<'a> Sum<&'a Wrapping<u32>> for Wrapping<u32>[−]

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fn sum<I>(iter: I) -> Wrapping<u32> where
    I: Iterator<Item = &'a Wrapping<u32>>, 

impl Sum<isize> for isize[−]

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fn sum<I>(iter: I) -> isize where
    I: Iterator<Item = isize>, 

impl<'a> Sum<&'a i64> for i64[−]

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fn sum<I>(iter: I) -> i64 where
    I: Iterator<Item = &'a i64>, 

impl Sum<Wrapping<i8>> for Wrapping<i8>[−]

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fn sum<I>(iter: I) -> Wrapping<i8> where
    I: Iterator<Item = Wrapping<i8>>, 

impl Sum<Wrapping<i32>> for Wrapping<i32>[−]

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fn sum<I>(iter: I) -> Wrapping<i32> where
    I: Iterator<Item = Wrapping<i32>>, 

impl<'a> Sum<&'a u8> for u8[−]

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fn sum<I>(iter: I) -> u8 where
    I: Iterator<Item = &'a u8>, 

impl Sum<Wrapping<u8>> for Wrapping<u8>[−]

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fn sum<I>(iter: I) -> Wrapping<u8> where
    I: Iterator<Item = Wrapping<u8>>, 

impl<'a> Sum<&'a Wrapping<i128>> for Wrapping<i128>[−]

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fn sum<I>(iter: I) -> Wrapping<i128> where
    I: Iterator<Item = &'a Wrapping<i128>>, 

impl Sum<Duration> for Duration[−]

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fn sum<I>(iter: I) -> Duration where
    I: Iterator<Item = Duration>, 

impl Sum<Wrapping<i128>> for Wrapping<i128>[−]

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fn sum<I>(iter: I) -> Wrapping<i128> where
    I: Iterator<Item = Wrapping<i128>>, 

impl Sum<u16> for u16[−]

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fn sum<I>(iter: I) -> u16 where
    I: Iterator<Item = u16>, 

impl Sum<usize> for usize[−]

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fn sum<I>(iter: I) -> usize where
    I: Iterator<Item = usize>, 

impl<'a> Sum<&'a f32> for f32[−]

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fn sum<I>(iter: I) -> f32 where
    I: Iterator<Item = &'a f32>, 

impl Sum<u64> for u64[−]

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fn sum<I>(iter: I) -> u64 where
    I: Iterator<Item = u64>, 

impl<'a> Sum<&'a u128> for u128[−]

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fn sum<I>(iter: I) -> u128 where
    I: Iterator<Item = &'a u128>, 

impl Sum<f64> for f64[−]

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fn sum<I>(iter: I) -> f64 where
    I: Iterator<Item = f64>, 

impl Sum<i8> for i8[−]

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fn sum<I>(iter: I) -> i8 where
    I: Iterator<Item = i8>, 

impl Sum<Wrapping<i64>> for Wrapping<i64>[−]

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fn sum<I>(iter: I) -> Wrapping<i64> where
    I: Iterator<Item = Wrapping<i64>>, 

impl Sum<i64> for i64[−]

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fn sum<I>(iter: I) -> i64 where
    I: Iterator<Item = i64>, 

impl<'a> Sum<&'a Wrapping<usize>> for Wrapping<usize>[−]

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fn sum<I>(iter: I) -> Wrapping<usize> where
    I: Iterator<Item = &'a Wrapping<usize>>, 

impl<'a> Sum<&'a Wrapping<u8>> for Wrapping<u8>[−]

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fn sum<I>(iter: I) -> Wrapping<u8> where
    I: Iterator<Item = &'a Wrapping<u8>>, 

impl<'a> Sum<&'a Wrapping<u64>> for Wrapping<u64>[−]

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fn sum<I>(iter: I) -> Wrapping<u64> where
    I: Iterator<Item = &'a Wrapping<u64>>, 

impl<'a> Sum<&'a Duration> for Duration[−]

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fn sum<I>(iter: I) -> Duration where
    I: Iterator<Item = &'a Duration>, 

impl<'a> Sum<&'a Wrapping<u16>> for Wrapping<u16>[−]

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fn sum<I>(iter: I) -> Wrapping<u16> where
    I: Iterator<Item = &'a Wrapping<u16>>, 

impl<'a> Sum<&'a Wrapping<u128>> for Wrapping<u128>[−]

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fn sum<I>(iter: I) -> Wrapping<u128> where
    I: Iterator<Item = &'a Wrapping<u128>>, 

impl<'a> Sum<&'a Wrapping<i32>> for Wrapping<i32>[−]

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fn sum<I>(iter: I) -> Wrapping<i32> where
    I: Iterator<Item = &'a Wrapping<i32>>, 

impl<'a> Sum<&'a i8> for i8[−]

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fn sum<I>(iter: I) -> i8 where
    I: Iterator<Item = &'a i8>, 

impl Sum<Wrapping<i16>> for Wrapping<i16>[−]

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fn sum<I>(iter: I) -> Wrapping<i16> where
    I: Iterator<Item = Wrapping<i16>>, 

Implementors

impl<T, U> Sum<Option<U>> for Option<T> where
    T: Sum<U>, [+]

fn sum<I>(iter: I) -> Option<T> where
    I: Iterator<Item = Option<U>>, [−]

Takes each element in the Iterator: if it is a None, no further elements are taken, and the None is returned. Should no None occur, the sum of all elements is returned.

Examples

This sums up the position of the character 'a' in a vector of strings, if a word did not have the character 'a' the operation returns None:

let words = vec!["have", "a", "great", "day"];
let total: Option<usize> = words.iter().map(|w| w.find('a')).sum();
assert_eq!(total, Some(5));

impl<T, U, E> Sum<Result<U, E>> for Result<T, E> where
    T: Sum<U>, [+]

fn sum<I>(iter: I) -> Result<T, E> where
    I: Iterator<Item = Result<U, E>>, [−]

Takes each element in the Iterator: if it is an Err, no further elements are taken, and the Err is returned. Should no Err occur, the sum of all elements is returned.

Examples

This sums up every integer in a vector, rejecting the sum if a negative element is encountered:

let v = vec![1, 2];
let res: Result<i32, &'static str> = v.iter().map(|&x: &i32|
    if x < 0 { Err("Negative element found") }
    else { Ok(x) }
).sum();
assert_eq!(res, Ok(3));

impl<T> Sum<T> for BigInt where     BigInt: Add<T, Output = BigInt>,

impl<T> Sum<T> for BigUint where     BigUint: Add<T, Output = BigUint>,

impl<T: Num + Clone> Sum<Complex<T>> for Complex<T>

impl<'a, T: 'a + Num + Clone> Sum<&'a Complex<T>> for Complex<T>

impl<T: Integer + Clone> Sum<Ratio<T>> for Ratio<T>

impl<'a, T: Integer + Clone> Sum<&'a Ratio<T>> for Ratio<T>

impl<T: Float + Sum> Sum<NotNan<T>> for NotNan<T>

impl<'a, T: Float + Sum> Sum<&'a NotNan<T>> for NotNan<T>