Enum programinduction::lambda::Expression [−][src]
pub enum Expression { Primitive(usize), Application(Box<Expression>, Box<Expression>), Abstraction(Box<Expression>), Index(usize), Invented(usize), }
Expressions of lambda calculus, which only make sense with an accompanying Language
.
Variants
Primitive(usize)
The number associated with a primitive is used by the Language to identify the primitive.
Application(Box<Expression>, Box<Expression>)
Abstraction(Box<Expression>)
Index(usize)
De Bruijn index referring to the nth-nearest abstraction (0-indexed).
For example, the identify function is (λ $0)
or Abstraction(Index(0))
.
Invented(usize)
The number associated with an invented expression is used by the Language to identify the invention.
Trait Implementations
impl Debug for Expression
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impl Debug for Expression
fn fmt(&self, f: &mut Formatter) -> Result
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fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl Clone for Expression
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impl Clone for Expression
fn clone(&self) -> Expression
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fn clone(&self) -> Expression
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Hash for Expression
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impl Hash for Expression
fn hash<__H: Hasher>(&self, state: &mut __H)
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fn hash<__H: Hasher>(&self, state: &mut __H)
Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
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fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more
impl PartialEq for Expression
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impl PartialEq for Expression
fn eq(&self, other: &Expression) -> bool
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fn eq(&self, other: &Expression) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, other: &Expression) -> bool
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fn ne(&self, other: &Expression) -> bool
This method tests for !=
.
impl Eq for Expression
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impl Eq for Expression
Auto Trait Implementations
impl Send for Expression
impl Send for Expression
impl Sync for Expression
impl Sync for Expression