Enum AttrNumber 

pub enum AttrNumber {
    Double(f64),
    Long(i64),
    ULong(u64),
}

A limit of an attribute: one of the bounds of one of its ranges, or the delta of its read-different-from-set alarm.

Tango carries these as strings, the type to read them as being the one of the attribute they belong to, and they are numbers by the time they get here: a limit is something to compare a value against, which is not something a string does.

They are not all the same number, though. A limit is a value of the attribute itself, so an attribute of the widest integer kinds has limits a double cannot hold without rounding them, and the three ways a Tango value is a number are kept apart rather than all being flattened into one:

• a floating attribute, DevFloat or DevDouble, has Self::Double limits;
• a signed one, up to DevLong64, has Self::Long limits;
• an unsigned one, up to DevULong64, has Self::ULong limits.

A device that writes a limit its own type cannot hold — half a unit on an integer attribute — still has a limit, and it is read as a Self::Double rather than lost.

Two limits compare as the quantities they stand for, whatever variant each is, so that Long(2) and Double(2.0) are equal: two integers are compared exactly, the widest ones included, and anything else as doubles, a not-a-number being equal to nothing and ordered with nothing.

Variants

Double(f64)

Long(i64)

ULong(u64)

Implementations

impl AttrNumber

pub fn as_f64(self) -> f64

This limit as a double, which is what comparing it against a value of any other kind goes through, the widest integers losing their last digits the way they do in any other conversion to a double.

Trait Implementations

impl Clone for AttrNumber

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for AttrNumber

impl Debug for AttrNumber

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

Formats the value using the given formatter.

impl Display for AttrNumber

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

Written the way a device writes it, which is what it goes back on the wire as.

impl From<f32> for AttrNumber

fn from(value: f32) -> Self

Converts to this type from the input type.

impl From<f64> for AttrNumber

fn from(value: f64) -> Self

Converts to this type from the input type.

impl From<i8> for AttrNumber

fn from(value: i8) -> Self

Converts to this type from the input type.

impl From<i16> for AttrNumber

fn from(value: i16) -> Self

Converts to this type from the input type.

impl From<i32> for AttrNumber

fn from(value: i32) -> Self

Converts to this type from the input type.

impl From<i64> for AttrNumber

fn from(value: i64) -> Self

Converts to this type from the input type.

impl From<u8> for AttrNumber

fn from(value: u8) -> Self

Converts to this type from the input type.

impl From<u16> for AttrNumber

fn from(value: u16) -> Self

Converts to this type from the input type.

impl From<u32> for AttrNumber

fn from(value: u32) -> Self

Converts to this type from the input type.

impl From<u64> for AttrNumber

fn from(value: u64) -> Self

Converts to this type from the input type.

impl PartialEq for AttrNumber

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for AttrNumber

fn partial_cmp(&self, other: &Self) -> 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.