Struct DecFloat 

pub struct DecFloat { /* private fields */ }

Um valor DECFLOAT decodificado.

Implementations

impl DecFloat

pub fn from_decimal64(bytes: [u8; 8]) -> DecFloat

Decodifica um DECFLOAT(16) (decimal64, 8 bytes) na ordem em que o Firebird o transmite (big-endian, como o INT128).

pub fn from_decimal128(bytes: [u8; 16]) -> DecFloat

Decodifica um DECFLOAT(34) (decimal128, 16 bytes), big-endian.

pub fn is_negative(&self) -> bool

Se é negativo (inclui -0 e -Infinity).

pub fn is_finite(&self) -> bool

Se é um valor finito (não Infinity nem NaN).

pub fn is_nan(&self) -> bool

Se é NaN (not a number).

pub fn is_infinite(&self) -> bool

Se é Infinity ou -Infinity.

pub fn to_parts(&self) -> Option<(bool, u128, i32)>

O coeficiente e o expoente de base 10 (valor = ±coefficient·10^exponent), para valores finitos.

pub fn from_parts(negative: bool, coefficient: u128, exponent: i32) -> DecFloat

Constrói um valor finito (-1)^negative · coefficient · 10^exponent.

pub fn infinity(negative: bool) -> DecFloat

±Infinity.

pub fn nan() -> DecFloat

NaN (quiet).

pub fn to_decimal64(&self) -> Option<[u8; 8]>

Codifica como DECFLOAT(16) (decimal64, 8 bytes big-endian, como o Firebird espera). None se o valor não couber em decimal64 (mais de 16 dígitos significativos ou expoente fora de faixa).

pub fn to_decimal128(&self) -> Option<[u8; 16]>

Codifica como DECFLOAT(34) (decimal128, 16 bytes big-endian).

Trait Implementations

impl Clone for DecFloat

fn clone(&self) -> DecFloat

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DecFloat

impl Debug for DecFloat

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

Formats the value using the given formatter.

impl Display for DecFloat

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

Formats the value using the given formatter.

impl Eq for DecFloat

impl FromStr for DecFloat

fn from_str(s: &str) -> Result<DecFloat, ParseDecFloatError>

Analisa um decimal como -123.45, 1.5E-3, Infinity/-Inf/NaN. Preserva os dígitos exatos (os zeros à direita são significativos).

type Err = ParseDecFloatError

The associated error which can be returned from parsing.

impl PartialEq for DecFloat

fn eq(&self, other: &DecFloat) -> 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 DecFloat