Enum Tier 

pub enum Tier {
    Any,
    Client,
    Server,
    Data,
}

Where code runs. §3.3’s table of what each tier can discharge.

Variants

Any

Pure and therefore unplaced: legal on every tier, compiled to each tier that needs it. “That duplication is the payoff, not waste” (§3.3).

Client

Server

Data

The fold/view engine — pure computation over streams and signals, plus durable.

Implementations

impl Tier

pub fn name(self) -> &'static str

pub fn parse(s: &str) -> Option<Tier>

pub fn discharges(self, e: &Effect) -> bool

Can this tier discharge that effect? §3.3’s table.

Tier::Any is the intersection: unplaced means legal everywhere, so any discharges exactly what all three concrete tiers discharge. That is why an ambient effect never forces a placement and durable always does, without either being a special case.

pub fn candidates(row: &Row) -> Vec<Tier>

Every tier that can discharge this whole row, in report order. An open row is treated as its known atoms: a row variable stands for a caller’s effects, which the caller must place.

Trait Implementations

impl Clone for Tier

fn clone(&self) -> Tier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Tier

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

Formats the value using the given formatter.

impl Hash for Tier

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 Tier

fn cmp(&self, other: &Tier) -> 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.

impl PartialEq for Tier

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Tier

fn partial_cmp(&self, other: &Tier) -> 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 Copy for Tier

impl Eq for Tier

impl StructuralPartialEq for Tier