Struct OutTarget 

pub struct OutTarget {
    pub field_type: Option<DbFieldType>,
    pub element_count: i64,
    pub is_ca_link: bool,
    pub puts_as_string: bool,
}

Resolved metadata of an OUT-link TARGET, as C’s soft device support obtains it before choosing its write buffer.

C’s two sources, both mirrored by PvDatabase::resolve_out_target:

• DB_LINK — dbNameToAddr gives field_type and no_elements (devsCalcoutSoft.c:127-131, devaCalcoutSoft.c:78-79); an unresolvable name leaves the caller’s initializers untouched.
• CA_LINK — dbCaGetLinkDBFtype / dbCaGetNelements (dbCa.c:662-704), which both return -1 on a disconnected link and likewise leave the initializers untouched.

A record reproduces its C device support’s buffer switch on this in Record::multi_output_buffer.

Fields

field_type: Option<DbFieldType>

Target field’s DBF type. None = unresolved (disconnected CA link, or a name this IOC cannot resolve) — C’s field_type initializer.

element_count: i64

Target field’s element capacity — C no_elements / dbCaGetNelements. 1 when unresolved, matching C’s n_elements = 1 initializer.

is_ca_link: bool

True when C would classify this link as a CA_LINK: an explicit ca:///pva:// link, or a DB-style name that is not a record of this IOC (dbInitLink locality). Device support that splits its buffer choice on sync-vs-async (devsCalcoutSoft.c:76, gated on plink->type == CA_LINK && pscalcout->wait) reads this.

puts_as_string: bool

True when the target field is one of the seven DBF classes C’s soft device support puts as DBR_STRING — DBF_STRING, DBF_ENUM, DBF_MENU, DBF_DEVICE, DBF_INLINK, DBF_OUTLINK, DBF_FWDLINK (devsCalcoutSoft.c:83-85, :128-130).

Carried here rather than re-derived from Self::field_type because DbFieldType is the DBR wire type: it has no Menu or Device variant, so a menu target (PRIO, STAT, SEVR, DISS, ACKT, …) or DTYP is indistinguishable from a plain numeric/string field by type alone. The classification is made once, at resolution, by the side that holds the target’s field metadata (RecordInstance::field_puts_as_string); a record’s Record::multi_output_buffer just reads the answer.

Implementations

impl OutTarget

pub const UNRESOLVED: Self

C’s initializer state: field_type = 0 is never used as a type by the port (a None type routes to the device support’s default: arm), and n_elements = 1. An unresolved target is not in the string class — C’s field_type = 0 matches no case and falls to default:.

Trait Implementations

impl Clone for OutTarget

fn clone(&self) -> OutTarget

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for OutTarget

impl Debug for OutTarget

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

Formats the value using the given formatter.

impl Eq for OutTarget

impl PartialEq for OutTarget

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for OutTarget