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 identifer 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 CoordType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Layer

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for RelationType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Role

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for StateType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for TextAttribute

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for TextBoundary

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for TextClipType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for TextGranularity

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for ValueType

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

Trait ToValue