leetcode::valid_number

Struct Solution

pub struct Solution;

Expand description

DFA

enum + Pattern Matching 实现状态机，再加上 Iterator/Result 的高阶函数组合工具，代码可读性比写个表找下标不知道高哪里去了。

另外，开始不需要 trim()，一是因为这个操作结合起来整个实现并没有这里的实现高效，二是内部调用了 char:is_whitespace() 不止判断了空格，还有其它空白字符，不一定符合题目的测试用例。

Implementations§

impl Solution

pub fn is_number(s: String) -> bool

Auto Trait Implementations§

impl Freeze for Solution

impl RefUnwindSafe for Solution

impl Send for Solution

impl Sync for Solution

impl Unpin for Solution

impl UnwindSafe for Solution

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.