Struct LoadRatio 

pub struct LoadRatio(/* private fields */);

Load ratio (pending requests / max connections)

Lower ratios indicate less loaded backends. Range: 0.0 (empty) to f64::MAX (no capacity).

Implementations

impl LoadRatio

pub const MAX: Self

Maximum load ratio when no capacity available

pub const MIN: Self

Minimum load ratio for empty backend

pub const fn new(ratio: f64) -> Self

Create a new load ratio

pub const fn get(&self) -> f64

Get the inner f64 value

Methods from Deref<Target = f64>

pub const RADIX: u32 = 2

pub const BITS: u32 = 64

pub const MANTISSA_DIGITS: u32 = 53

pub const DIGITS: u32 = 15

pub const EPSILON: f64 = 2.220446049250313e-16_f64

pub const MIN: f64 = -1.7976931348623157e+308_f64

pub const MIN_POSITIVE: f64 = 2.2250738585072014e-308_f64

pub const MAX: f64 = 1.7976931348623157e+308_f64

pub const MIN_EXP: i32 = -1021

pub const MAX_EXP: i32 = 1024

pub const MIN_10_EXP: i32 = -307

pub const MAX_10_EXP: i32 = 308

pub const NAN: f64

pub const INFINITY: f64

pub const NEG_INFINITY: f64

pub const MAX_EXACT_INTEGER: i64

pub const MIN_EXACT_INTEGER: i64

pub const SIGN_MASK: u64 = 0x8000_0000_0000_0000

pub const EXPONENT_MASK: u64 = 0x7ff0_0000_0000_0000

pub const MANTISSA_MASK: u64 = 0x000f_ffff_ffff_ffff

pub fn total_cmp(&self, other: &f64) -> Ordering

Returns the ordering between self and other.

Unlike the standard partial comparison between floating point numbers, this comparison always produces an ordering in accordance to the totalOrder predicate as defined in the IEEE 754 (2008 revision) floating point standard. The values are ordered in the following sequence:

• negative quiet NaN
• negative signaling NaN
• negative infinity
• negative numbers
• negative subnormal numbers
• negative zero
• positive zero
• positive subnormal numbers
• positive numbers
• positive infinity
• positive signaling NaN
• positive quiet NaN.

The ordering established by this function does not always agree with the PartialOrd and PartialEq implementations of f64. For example, they consider negative and positive zero equal, while total_cmp doesn’t.

The interpretation of the signaling NaN bit follows the definition in the IEEE 754 standard, which may not match the interpretation by some of the older, non-conformant (e.g. MIPS) hardware implementations.

Example

struct GoodBoy {
    name: String,
    weight: f64,
}

let mut bois = vec![
    GoodBoy { name: "Pucci".to_owned(), weight: 0.1 },
    GoodBoy { name: "Woofer".to_owned(), weight: 99.0 },
    GoodBoy { name: "Yapper".to_owned(), weight: 10.0 },
    GoodBoy { name: "Chonk".to_owned(), weight: f64::INFINITY },
    GoodBoy { name: "Abs. Unit".to_owned(), weight: f64::NAN },
    GoodBoy { name: "Floaty".to_owned(), weight: -5.0 },
];

bois.sort_by(|a, b| a.weight.total_cmp(&b.weight));

// `f64::NAN` could be positive or negative, which will affect the sort order.
if f64::NAN.is_sign_negative() {
    assert!(bois.into_iter().map(|b| b.weight)
        .zip([f64::NAN, -5.0, 0.1, 10.0, 99.0, f64::INFINITY].iter())
        .all(|(a, b)| a.to_bits() == b.to_bits()))
} else {
    assert!(bois.into_iter().map(|b| b.weight)
        .zip([-5.0, 0.1, 10.0, 99.0, f64::INFINITY, f64::NAN].iter())
        .all(|(a, b)| a.to_bits() == b.to_bits()))
}

Trait Implementations

impl AsRef<f64> for LoadRatio

fn as_ref(&self) -> &f64

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for LoadRatio

fn clone(&self) -> LoadRatio

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LoadRatio

impl Debug for LoadRatio

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

Formats the value using the given formatter.

impl Deref for LoadRatio

type Target = f64

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl Display for LoadRatio

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

Formats the value using the given formatter.

impl From<f64> for LoadRatio

fn from(value: f64) -> Self

Converts to this type from the input type.

impl PartialEq for LoadRatio

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for LoadRatio

fn partial_cmp(&self, other: &Self) -> Option<CmpOrdering>

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 StructuralPartialEq for LoadRatio