Trait nom::lib::std::iter::Sum 1.12.0[−][src]
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
pub fn sum<I>(iter: I) -> Self where
I: Iterator<Item = A>,
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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<'a> Sum<&'a u64> for u64
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impl<'a> Sum<&'a i16> for i16
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impl Sum<u32> for u32
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impl Sum<i64> for i64
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impl<'a> Sum<&'a Wrapping<u32>> for Wrapping<u32>
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impl Sum<Wrapping<i8>> for Wrapping<i8>
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impl<'a> Sum<&'a i64> for i64
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impl<'a> Sum<&'a Wrapping<u16>> for Wrapping<u16>
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impl Sum<Wrapping<u8>> for Wrapping<u8>
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impl<'a> Sum<&'a Wrapping<u128>> for Wrapping<u128>
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impl<'a> Sum<&'a Wrapping<u64>> for Wrapping<u64>
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impl<'a> Sum<&'a Wrapping<i64>> for Wrapping<i64>
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impl<'a> Sum<&'a i8> for i8
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impl Sum<Wrapping<isize>> for Wrapping<isize>
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impl Sum<u16> for u16
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impl Sum<usize> for usize
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impl<'a> Sum<&'a Wrapping<i16>> for Wrapping<i16>
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impl Sum<i32> for i32
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impl Sum<Wrapping<usize>> for Wrapping<usize>
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impl Sum<i16> for i16
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impl<'a> Sum<&'a isize> for isize
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impl Sum<Duration> for Duration
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impl<'a> Sum<&'a Wrapping<u8>> for Wrapping<u8>
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impl Sum<Wrapping<u16>> for Wrapping<u16>
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impl Sum<i128> for i128
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impl Sum<u8> for u8
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impl<'a> Sum<&'a i32> for i32
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impl<'a> Sum<&'a u32> for u32
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impl<'a> Sum<&'a Wrapping<usize>> for Wrapping<usize>
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impl<'a> Sum<&'a Wrapping<i128>> for Wrapping<i128>
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impl<'a> Sum<&'a u8> for u8
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impl<'a> Sum<&'a u16> for u16
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impl Sum<Wrapping<i32>> for Wrapping<i32>
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impl<'a> Sum<&'a i128> for i128
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impl<'a> Sum<&'a usize> for usize
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impl Sum<isize> for isize
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impl Sum<Wrapping<i128>> for Wrapping<i128>
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impl Sum<f64> for f64
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impl Sum<u64> for u64
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impl<'a> Sum<&'a Wrapping<i32>> for Wrapping<i32>
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impl<'a> Sum<&'a u128> for u128
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impl<'a> Sum<&'a f64> for f64
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impl Sum<f32> for f32
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impl<'a> Sum<&'a Wrapping<isize>> for Wrapping<isize>
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impl<'a> Sum<&'a f32> for f32
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impl<'a> Sum<&'a Duration> for Duration
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impl<'a> Sum<&'a Wrapping<i8>> for Wrapping<i8>
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impl Sum<Wrapping<u32>> for Wrapping<u32>
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impl Sum<Wrapping<i64>> for Wrapping<i64>
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impl Sum<Wrapping<u128>> for Wrapping<u128>
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impl Sum<i8> for i8
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impl Sum<Wrapping<u64>> for Wrapping<u64>
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impl Sum<Wrapping<i16>> for Wrapping<i16>
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impl Sum<u128> for u128
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impl<R> Sum<BitSel<R>> for BitMask<R> where
R: BitRegister,
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Loading content...R: BitRegister,
Implementors
impl<T, U> Sum<Option<U>> for Option<T> where
T: Sum<U>,
1.37.0[src]
T: Sum<U>,
pub fn sum<I>(iter: I) -> Option<T> where
I: Iterator<Item = Option<U>>,
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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>,
1.16.0[src]
T: Sum<U>,
pub fn sum<I>(iter: I) -> Result<T, E> where
I: Iterator<Item = Result<U, E>>,
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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));