Struct LinkMetadata 

pub struct LinkMetadata {
    pub dbf_type: Option<LinkDbfType>,
    pub element_count: Option<i64>,
    pub graphic_limits: Option<(f64, f64)>,
    pub control_limits: Option<(f64, f64)>,
    pub alarm_limits: Option<(f64, f64, f64, f64)>,
    pub precision: Option<i16>,
    pub units: Option<String>,
    pub description: Option<String>,
}

Remote display / control / valueAlarm metadata snapshot for a link, as exposed by pvxs’s pvalink lset metadata getters.

Mirrors the pvxs pvalink_lset.cpp metadata getter set installed at pvxs/ioc/pvalink_lset.cpp:700: pvaGetDBFtype, pvaGetElements, pvaGetControlLimits, pvaGetGraphicLimits, pvaGetAlarmLimits, pvaGetPrecision, pvaGetUnits.

Every field is optional: pvxs’s getters read the cached NT structure with Value::as, which leaves the caller’s buffer unchanged when the sub-field is absent. None here means the remote NT value carried no such metadata — the record support then keeps its local/default metadata, exactly as the C path does.

Fields

dbf_type: Option<LinkDbfType>

DBF type the remote value maps to (pvaGetDBFtype). A connected link always reports a type — an unmappable value shape falls back to Long, the default: arm of pvxs pvaGetDBFtype (pvalink_lset.cpp:199-236). None therefore means “not connected” (no cached value), never “connected but unmappable”.

element_count: Option<i64>

Element count: array length, or 1 for a scalar / any connected non-array shape (pvaGetElements, pvalink_lset.cpp:242-254). As with dbf_type, None means “not connected”.

graphic_limits: Option<(f64, f64)>

display.limitLow / display.limitHigh (pvaGetGraphicLimits).

control_limits: Option<(f64, f64)>

control.limitLow / control.limitHigh (pvaGetControlLimits).

alarm_limits: Option<(f64, f64, f64, f64)>

valueAlarm.{lowAlarmLimit,lowWarningLimit,highWarningLimit, highAlarmLimit} as (lolo, lo, hi, hihi) (pvaGetAlarmLimits).

precision: Option<i16>

display.precision (pvaGetPrecision).

units: Option<String>

display.units (pvaGetUnits).

description: Option<String>

display.description — carried so a link snapshot is complete; pvxs exposes it through the same fld_meta cache.

Trait Implementations

impl Clone for LinkMetadata

fn clone(&self) -> LinkMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LinkMetadata

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

Formats the value using the given formatter.

impl Default for LinkMetadata

fn default() -> LinkMetadata

Returns the “default value” for a type.

impl PartialEq for LinkMetadata

fn eq(&self, other: &LinkMetadata) -> 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 StructuralPartialEq for LinkMetadata