Trait ToValue

Source

pub trait ToValue {
    // Required methods
    fn to_value(&self) -> Value;
    fn value_type(&self) -> Type;
}

Expand description

Trait to convert a value to a Value.

Similar to other common conversion traits, the following invariants are guaranteed:

Invertibility: x.to_value().get().unwrap() == x. In words, FromValue is the inverse of ToValue.
Idempotence: x.to_value() == x.to_value().to_value(). In words, applying ToValue multiple times yields the same result as applying it once. Idempotence also applies the other way around: value.get::<Value>() is a no-op.

There is also the possibility to wrap values within values, see BoxedValue. All (un-)boxing needs to be done manually, and will be preserved under the conversion methods.

The conversion methods may cause values to be cloned, which may result in reference counter changes or heap allocations depending on the source and target type.

Required Methods§

Source

fn to_value(&self) -> Value

Convert a value to a Value.

Source

fn value_type(&self) -> Type

Returns the type identifier of self.

This is the type of the value to be returned by to_value.

Trait ToValueCopy item path

Required Methods§

fn to_value(&self) -> Value

fn value_type(&self) -> Type

Implementations on Foreign Types§

impl ToValue for &str

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for &Path

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for &[&str]

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Antialias

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Content

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for DeviceType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Extend

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for FillRule

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Filter

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for FontSlant

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for FontType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for FontWeight

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Format

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for HintMetrics

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for HintStyle

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for LineCap

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for LineJoin

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Operator

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for PathDataType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for PatternType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for RegionOverlap

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for SubpixelOrder

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for SurfaceType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for TextClusterFlags

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for AxisUse

fn to_value(&self) -> Value

fn value_type(&self) -> Type

Trait ToValue