Enum MemoryRelationKind 

pub enum MemoryRelationKind {
    Answers,
    Authorizes,
    ChosenBecause,
    AchievedBy,
    FollowsFrom,
    SatisfiesConstraint,
    ViolatesConstraint,
    Supersedes,
    Contradicts,
}

How one remembered thing explains another.

Named in this engine’s terms and not a memory backend’s. What a particular kernel calls these, and how it classes them, is a mapping an adapter owns — an engine that spoke one backend’s taxonomy would have to change when that backend did.

Each kind says who is in a position to assert it, because that is the difference between a reason and a guess. The engine asserts only what it can see in its own aggregate; everything else is asserted by whoever did the reasoning.

Variants

Answers

This is the reply to what that one asked.

The engine asserts this: a contribution and the agenda item it was made against are both in the session, and which answers which is not a judgement.

Authorizes

This was decided because of that.

Asserted by whoever decided. The engine cannot infer it — something being written down before a decision is not what made the decision, and recording it as though it were is how a coincidence becomes a precedent. That decision is what permitted this action.

The kernel’s authorizes, which its parser learned in #146. Causal rather than motivational: a decision that permits an action is part of why the action was possible, not part of why anybody wanted it.

ChosenBecause

AchievedBy

This was brought about by doing that — the how.

Not a weaker form of cause. A reason says what made something necessary; this says what was actually done, and it is what makes a memory repeatable rather than only understandable. A session that recorded why it resolved and not how leaves a precedent nobody can turn into a procedure.

FollowsFrom

This came about because of that.

Asserted by whoever can vouch for it. The strongest claim available and the easiest to make carelessly: a session ending well after an action is not the action having worked.

SatisfiesConstraint

This honours a limit that one set.

ViolatesConstraint

This breaks a limit that one set, knowingly.

Supersedes

This replaces that as what is believed now.

What was superseded is not deleted: a later session asking what was thought at the time needs the belief that was replaced, and a session that quietly overwrote it would answer with today’s knowledge about yesterday’s decision.

Contradicts

These cannot both be true.

Kept rather than resolved. Two sessions that reached opposite conclusions are a fact about the problem, and flattening them into one would lose the only warning a third session gets.

Implementations

impl MemoryRelationKind

pub const fn as_label(self) -> &'static str

pub const fn is_observable_by_the_engine(self) -> bool

Whether this engine can assert the relation on its own.

Everything else needs someone who did the reasoning to say so. Kept as a property rather than as a comment so a caller that generates relations automatically can be stopped from generating the ones nobody is entitled to.

pub const fn is_method(self) -> bool

Whether this says how something was done rather than why.

Worth telling apart: a memory kernel measuring how explanatory a memory is counts causes, motives and evidence, and does not count method. A session with method and no cause scores zero on that measure and is not thereby worthless — it is repeatable and unexplained, which is a different thing from explained and unrepeatable.

Trait Implementations

impl Clone for MemoryRelationKind

fn clone(&self) -> MemoryRelationKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MemoryRelationKind

impl Debug for MemoryRelationKind

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MemoryRelationKind

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for MemoryRelationKind

impl Hash for MemoryRelationKind

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for MemoryRelationKind

fn cmp(&self, other: &MemoryRelationKind) -> Ordering

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for MemoryRelationKind

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

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for MemoryRelationKind

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

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

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

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

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

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

impl Serialize for MemoryRelationKind

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for MemoryRelationKind