Enum tuber::Expr

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pub enum Expr {
    Variable(Identifier),
    Symbol(Identifier),
    Apply {
        lhs: Box<Expr>,
        rhs: Box<Expr>,
    },
    Lambda {
        param: Identifier,
        body: Box<Expr>,
    },
}

Variants§

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Variable(Identifier)

変数

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Symbol(Identifier)

シンボル

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Apply

Fields

§lhs: Box<Expr>
§rhs: Box<Expr>

適用

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Lambda

Fields

§body: Box<Expr>

ラムダ抽象

Implementations§

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impl Expr

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pub fn substitute(&mut self, param: &Identifier, arg: &Expr)

指定した識別子を別の式で置き換えた新しい式を得る

ラムダ抽象の中で束縛されている束縛変数と自由変数の衝突を避けるため 束縛変数のリネームを行うことがある (α変換)

Trait Implementations§

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impl Clone for Expr

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fn clone(&self) -> Expr

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Expr

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

Formats the value using the given formatter. Read more
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impl Display for Expr

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

Formats the value using the given formatter. Read more
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impl Format for &Expr

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fn format(&self, style: &DisplayStyle) -> String

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impl Format for Expr

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fn format(&self, style: &DisplayStyle) -> String

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impl From<&str> for Expr

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fn from(s: &str) -> Self

Converts to this type from the input type.
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impl From<Func> for Expr

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fn from(f: Func) -> Expr

Converts to this type from the input type.
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impl From<String> for Expr

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fn from(s: String) -> Self

Converts to this type from the input type.
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impl PartialEq<Expr> for Expr

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fn eq(&self, other: &Expr) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl StructuralPartialEq for Expr

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impl RefUnwindSafe for Expr

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impl Send for Expr

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impl Sync for Expr

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impl Unpin for Expr

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impl UnwindSafe for Expr

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.