Struct sudoku_backend::ops::constraints::Positive

pub struct Positive<T: FromStr + From<i32> + PartialOrd>(pub T);

Weakly validate the int to be positive.

The error type can be deconstructed as:

• Some(err) ⇒ number parsing failed due to the specified error
• None ⇒ number nonpositive

Examples

assert_eq!(Positive::<i32>::from_str("12"), Ok(Positive(12)));
assert_eq!(Positive::<f64>::from_str("0.8113"), Ok(Positive(0.8113)));

assert!(Positive::<i32>::from_str("hi").is_err());
assert!(Positive::<i32>::from_str("0").is_err());
assert!(Positive::<f64>::from_str("-123").is_err());

Trait Implementations

impl<T: PartialEq + FromStr + From<i32> + PartialOrd> PartialEq<Positive<T>> for Positive<T>

fn eq(&self, other: &Positive<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Positive<T>) -> bool

This method tests for !=.

impl<T: Clone + FromStr + From<i32> + PartialOrd> Clone for Positive<T>

fn clone(&self) -> Positive<T>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Copy + FromStr + From<i32> + PartialOrd> Copy for Positive<T>

impl<T: Ord + FromStr + From<i32> + PartialOrd> Ord for Positive<T>

fn cmp(&self, other: &Positive<T>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

impl<T: Eq + FromStr + From<i32> + PartialOrd> Eq for Positive<T>

impl<T: PartialOrd + FromStr + From<i32> + PartialOrd> PartialOrd<Positive<T>> for Positive<T>

fn partial_cmp(&self, other: &Positive<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Positive<T>) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Positive<T>) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Positive<T>) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Positive<T>) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T: Debug + FromStr + From<i32> + PartialOrd> Debug for Positive<T>

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<T: FromStr + From<i32> + PartialOrd> FromStr for Positive<T> where     <T as FromStr>::Err: ToString,

type Err = Self::Error

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl<T: Hash + FromStr + From<i32> + PartialOrd> Hash for Positive<T>

fn hash<__HT: Hasher>(&self, state: &mut __HT)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where     H: Hasher,

Feeds a slice of this type into the given [Hasher].

impl<T: FromStr + From<i32> + PartialOrd> Serialize for Positive<T> where     T: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where     __S: Serializer,

Serialize this value into the given Serde serializer.

impl<'de, T: FromStr + From<i32> + PartialOrd> Deserialize<'de> for Positive<T> where     T: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where     __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'v, T: FromStr + From<i32> + PartialOrd> FromFormValue<'v> for Positive<T> where     <T as FromStr>::Err: ToString,

type Error = Option<String>

The associated error which can be returned from parsing. It is a good idea to have the return type be or contain an &'v str so that the unparseable string can be examined after a bad parse.

fn from_form_value(form_value: &'v RawStr) -> Result<Self, Self::Error>

Parses an instance of Self from an HTTP form field value or returns an Error if one cannot be parsed.

fn default() -> Option<Self>

Returns a default value to be used when the form field does not exist. If this returns None, then the field is required. Otherwise, this should return Some(default_value). The default implementation simply returns None.