Trait FromJSValConvertible 

pub trait FromJSValConvertible: Sized {
    type Config;

    // Required method
    unsafe fn from_jsval(
        cx: *mut JSContext,
        val: HandleValue<'_>,
        option: Self::Config,
    ) -> Result<ConversionResult<Self>, ()>;

    // Provided method
    fn safe_from_jsval(
        cx: &mut JSContext,
        val: HandleValue<'_>,
        option: Self::Config,
    ) -> Result<ConversionResult<Self>, ()> { ... }
}

A trait to convert JSVals to Rust types.

Required Associated Types

type Config

Optional configurable behaviour switch; use () for no configuration.

Required Methods

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, option: Self::Config, ) -> Result<ConversionResult<Self>, ()>

Convert val to type Self. Optional configuration of type T can be passed as the option argument. If it returns Err(()), a JSAPI exception is pending. If it returns Ok(Failure(reason)), there is no pending JSAPI exception.

Provided Methods

fn safe_from_jsval( cx: &mut JSContext, val: HandleValue<'_>, option: Self::Config, ) -> Result<ConversionResult<Self>, ()>

Convert val to type Self. Optional configuration of type T can be passed as the option argument. If it returns Err(()), a JSAPI exception is pending. If it returns Ok(Failure(reason)), there is no pending JSAPI exception.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl FromJSValConvertible for bool

type Config = ()

unsafe fn from_jsval( _cx: *mut JSContext, val: HandleValue<'_>, _option: (), ) -> Result<ConversionResult<bool>, ()>

impl FromJSValConvertible for f32

type Config = ()

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, _option: (), ) -> Result<ConversionResult<f32>, ()>

impl FromJSValConvertible for f64

type Config = ()

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, _option: (), ) -> Result<ConversionResult<f64>, ()>

impl FromJSValConvertible for i8

type Config = ConversionBehavior

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, option: ConversionBehavior, ) -> Result<ConversionResult<i8>, ()>

impl FromJSValConvertible for i16

type Config = ConversionBehavior

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, option: ConversionBehavior, ) -> Result<ConversionResult<i16>, ()>

impl FromJSValConvertible for i32

type Config = ConversionBehavior

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, option: ConversionBehavior, ) -> Result<ConversionResult<i32>, ()>

impl FromJSValConvertible for i64

type Config = ConversionBehavior

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, option: ConversionBehavior, ) -> Result<ConversionResult<i64>, ()>

impl FromJSValConvertible for *mut JSObject

type Config = ()

unsafe fn from_jsval( cx: *mut JSContext, value: HandleValue<'_>, _option: (), ) -> Result<ConversionResult<*mut JSObject>, ()>

impl FromJSValConvertible for *mut Symbol

type Config = ()

unsafe fn from_jsval( cx: *mut JSContext, value: HandleValue<'_>, _option: (), ) -> Result<ConversionResult<*mut Symbol>, ()>

impl FromJSValConvertible for u8

type Config = ConversionBehavior

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, option: ConversionBehavior, ) -> Result<ConversionResult<u8>, ()>

impl FromJSValConvertible for u16

type Config = ConversionBehavior

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, option: ConversionBehavior, ) -> Result<ConversionResult<u16>, ()>

impl FromJSValConvertible for u32

type Config = ConversionBehavior

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, option: ConversionBehavior, ) -> Result<ConversionResult<u32>, ()>

impl FromJSValConvertible for u64

type Config = ConversionBehavior

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, option: ConversionBehavior, ) -> Result<ConversionResult<u64>, ()>

impl FromJSValConvertible for String

type Config = ()

unsafe fn from_jsval( cx: *mut JSContext, value: HandleValue<'_>, _: (), ) -> Result<ConversionResult<String>, ()>

impl<C: Clone, T: FromJSValConvertible<Config = C>> FromJSValConvertible for Vec<T>

type Config = C

unsafe fn from_jsval( cx: *mut JSContext, value: HandleValue<'_>, option: C, ) -> Result<ConversionResult<Vec<T>>, ()>

impl<T: FromJSValConvertible> FromJSValConvertible for Option<T>

type Config = <T as FromJSValConvertible>::Config

unsafe fn from_jsval( cx: *mut JSContext, value: HandleValue<'_>, option: T::Config, ) -> Result<ConversionResult<Option<T>>, ()>

impl<T: FromJSValConvertibleRc> FromJSValConvertible for Rc<T>

type Config = ()

unsafe fn from_jsval( cx: *mut JSContext, val: HandleValue<'_>, _option: (), ) -> Result<ConversionResult<Rc<T>>, ()>

fn safe_from_jsval( cx: &mut JSContext, val: HandleValue<'_>, _option: (), ) -> Result<ConversionResult<Rc<T>>, ()>

Implementors

impl FromJSValConvertible for JSVal

type Config = ()

impl<T: TypedArrayElement, S: JSObjectStorage> FromJSValConvertible for TypedArray<T, S>

type Config = ()