Enum Value

#[non_exhaustive]
pub enum Value {
    None,
    RcBinary(Rc<Vec<u8>>),
    ArcBinary(Arc<Vec<u8>>),
    String(Rc<String>),
    Int(i64),
    Float(f64),
    Bool(bool),
    For(Rc<RefCell<ForState>>),
    ForSort(Rc<RefCell<ForSortState>>),
}

Simple value ( Binary, String, Int, Float, Bool ).

When stored in a database record, binary(n) and string(n) values are allocated (n+1) bytes (8<=n<=249). If the value is more than n bytes, the first (n-8) bytes are stored inline, and the rest are coded.

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.

None

No value.

RcBinary(Rc<Vec<u8>>)

Binary.

ArcBinary(Arc<Vec<u8>>)

Arc Binary.

String(Rc<String>)

String.

Int(i64)

Integer.

Float(f64)

Float.

Bool(bool)

Bool.

For(Rc<RefCell<ForState>>)

For expression.

ForSort(Rc<RefCell<ForSortState>>)

For expression ( sorted case ).

Implementations

impl Value

pub fn default(t: DataType) -> Value

Get the default Value for a DataType.

pub fn load(db: &DB, typ: DataType, data: &[u8], off: usize) -> (Value, Code)

Get a Value from byte data.

pub fn save(&self, typ: DataType, data: &mut [u8], off: usize, code: Code)

Save a Value to byte data.

pub fn str(&self) -> Rc<String>

Convert a Value to a String.

pub fn int(&self) -> i64

Get integer value.

pub fn float(&self) -> f64

Get float value.

pub fn append(&mut self, val: &Value)

Append to a String.

pub fn inc(&mut self, val: &Value)

Inc an integer or float.

pub fn dec(&mut self, val: &Value)

Dec an integer or float.

pub fn bin(&self) -> Rc<Vec<u8>>

Convert a Value to a Binary.

pub fn bina(&self) -> &[u8]

Borrow address of Binary value.

Trait Implementations

impl Clone for Value

fn clone(&self) -> Value

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Ord for Value

Value comparison.

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Value

fn eq(&self, other: &Self) -> 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 PartialOrd for Value

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.

impl Eq for Value