Enum MultiValuesRef 

#[non_exhaustive]
pub enum MultiValuesRef<'a> {
    Unset(DataType),
    Bool(&'a [bool]),
    Char(&'a [char]),
    Int8(&'a [i8]),
    Int16(&'a [i16]),
    Int32(&'a [i32]),
    Int64(&'a [i64]),
    Int128(&'a [i128]),
    UInt8(&'a [u8]),
    UInt16(&'a [u16]),
    UInt32(&'a [u32]),
    UInt64(&'a [u64]),
    UInt128(&'a [u128]),
    Float32(&'a [f32]),
    Float64(&'a [f64]),
    BigInteger(&'a [BigInt]),
    BigDecimal(&'a [BigDecimal]),
    String(&'a [String]),
    Date(&'a [NaiveDate]),
    Time(&'a [NaiveTime]),
    DateTime(&'a [NaiveDateTime]),
    Instant(&'a [DateTime<Utc>]),
    Duration(&'a [Duration]),
    Url(&'a [Url]),
    StringMap(&'a [HashMap<String, String>]),
    Json(&'a [Value]),
}

Borrowed semantic view preserving source types without owning payloads.

The lifetime is that of the source storage; copying this view does not clone strings, maps, JSON, or other rich payloads.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Unset(DataType)

Unset storage retaining its declared type.

Tuple Fields

0: DataType

Declared source type.

Bool(&'a [bool])

Boolean value list

Tuple Fields

0: &'a [bool]

Borrowed or copied source payload.

Char(&'a [char])

Character value list

Tuple Fields

0: &'a [char]

Borrowed or copied source payload.

Int8(&'a [i8])

8-bit signed integer list

Tuple Fields

0: &'a [i8]

Borrowed or copied source payload.

Int16(&'a [i16])

16-bit signed integer list

Tuple Fields

0: &'a [i16]

Borrowed or copied source payload.

Int32(&'a [i32])

32-bit signed integer list

Tuple Fields

0: &'a [i32]

Borrowed or copied source payload.

Int64(&'a [i64])

64-bit signed integer list

Tuple Fields

0: &'a [i64]

Borrowed or copied source payload.

Int128(&'a [i128])

128-bit signed integer list

Tuple Fields

0: &'a [i128]

Borrowed or copied source payload.

UInt8(&'a [u8])

8-bit unsigned integer list

Tuple Fields

0: &'a [u8]

Borrowed or copied source payload.

UInt16(&'a [u16])

16-bit unsigned integer list

Tuple Fields

0: &'a [u16]

Borrowed or copied source payload.

UInt32(&'a [u32])

32-bit unsigned integer list

Tuple Fields

0: &'a [u32]

Borrowed or copied source payload.

UInt64(&'a [u64])

64-bit unsigned integer list

Tuple Fields

0: &'a [u64]

Borrowed or copied source payload.

UInt128(&'a [u128])

128-bit unsigned integer list

Tuple Fields

0: &'a [u128]

Borrowed or copied source payload.

Float32(&'a [f32])

32-bit floating-point number list

Tuple Fields

0: &'a [f32]

Borrowed or copied source payload.

Float64(&'a [f64])

64-bit floating-point number list

Tuple Fields

0: &'a [f64]

Borrowed or copied source payload.

BigInteger(&'a [BigInt])

Arbitrary-precision integer list

Tuple Fields

0: &'a [BigInt]

Borrowed or copied source payload.

BigDecimal(&'a [BigDecimal])

Arbitrary-precision decimal list

Tuple Fields

0: &'a [BigDecimal]

Borrowed or copied source payload.

String(&'a [String])

String value list

Tuple Fields

0: &'a [String]

Borrowed or copied source payload.

Date(&'a [NaiveDate])

Calendar date list

Tuple Fields

0: &'a [NaiveDate]

Borrowed or copied source payload.

Time(&'a [NaiveTime])

Time-of-day list

Tuple Fields

0: &'a [NaiveTime]

Borrowed or copied source payload.

DateTime(&'a [NaiveDateTime])

Date-and-time list

Tuple Fields

0: &'a [NaiveDateTime]

Borrowed or copied source payload.

Instant(&'a [DateTime<Utc>])

UTC instant list

Tuple Fields

0: &'a [DateTime<Utc>]

Borrowed or copied source payload.

Duration(&'a [Duration])

Duration list

Tuple Fields

0: &'a [Duration]

Borrowed or copied source payload.

Url(&'a [Url])

URL list

Tuple Fields

0: &'a [Url]

Borrowed or copied source payload.

StringMap(&'a [HashMap<String, String>])

String-map list

Tuple Fields

0: &'a [HashMap<String, String>]

Borrowed or copied source payload.

Json(&'a [Value])

JSON value list

Tuple Fields

0: &'a [Value]

Borrowed or copied source payload.

Implementations

impl<'a> MultiValuesRef<'a>

pub fn data_type(self) -> DataType

Returns the element type, including for unset or empty storage.

Returns

The declared runtime element type.

pub fn len(self) -> usize

Returns the number of stored elements; unset storage has length zero.

Returns

The number of concrete elements, or zero for unset storage.

pub fn is_empty(self) -> bool

Reports whether no concrete elements are available.

Returns

true for unset or empty storage; otherwise false.

pub fn get(self, index: usize) -> Option<ValueRef<'a>>

Borrows the indexed element, returning None for unset or out-of-range reads.

Numeric and boolean payloads are copied. Text and rich payloads retain the original storage lifetime and are never cloned.

Parameters

• index - Zero-based element position to borrow.

Returns

Some with the indexed element, or None when storage is unset or index is out of bounds.

Trait Implementations

impl<'a> Clone for MultiValuesRef<'a>

fn clone(&self) -> MultiValuesRef<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for MultiValuesRef<'a>

impl<'a> Debug for MultiValuesRef<'a>

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

Formats the value using the given formatter.