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Implement FromIterator for String

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VersBinarii 2022-03-15 15:36:10 +01:00
parent 9fb9cd7045
commit c7bc3c8166
1 changed files with 45 additions and 1 deletions
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46
src/string.rs
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@ -1,4 +1,4 @@
use core::{cmp::Ordering, fmt, fmt::Write, hash, ops, str};
use core::{cmp::Ordering, fmt, fmt::Write, hash, iter, ops, str};
use hash32;
@ -307,6 +307,36 @@ impl<const N: usize> str::FromStr for String<N> {
}
}
impl<const N: usize> iter::FromIterator<char> for String<N> {
fn from_iter<T: IntoIterator<Item = char>>(iter: T) -> Self {
let mut new = String::new();
for c in iter {
new.push(c).unwrap();
}
new
}
}
impl<'a, const N: usize> iter::FromIterator<&'a char> for String<N> {
fn from_iter<T: IntoIterator<Item = &'a char>>(iter: T) -> Self {
let mut new = String::new();
for c in iter {
new.push(*c).unwrap();
}
new
}
}
impl<'a, const N: usize> iter::FromIterator<&'a str> for String<N> {
fn from_iter<T: IntoIterator<Item = &'a str>>(iter: T) -> Self {
let mut new = String::new();
for c in iter {
new.push_str(c).unwrap();
}
new
}
}
impl<const N: usize> Clone for String<N> {
fn clone(&self) -> Self {
Self {
@ -558,6 +588,20 @@ mod tests {
assert_eq!(e, ());
}
#[test]
fn from_iter() {
let mut v: Vec<char, 5> = Vec::new();
v.push('h').unwrap();
v.push('e').unwrap();
v.push('l').unwrap();
v.push('l').unwrap();
v.push('o').unwrap();
let string1: String<5> = v.iter().collect(); //&char
let string2: String<5> = "hello".chars().collect(); //char
assert_eq!(string1, "hello");
assert_eq!(string2, "hello");
}
#[test]
#[should_panic]
fn from_panic() {