Trait CastFromJs

pub trait CastFromJs:
    Sized
    + RefFromWasmAbi<Abi = u32>
    + LongRefFromWasmAbi<Abi = u32> {
    // Required methods
    fn try_ref_from_js_value<'a, R>(
        js_value: &'a R,
    ) -> Result<Self::Anchor, Error>
       where R: AsRef<JsValue> + 'a;
    fn try_long_ref_from_js_value<'a, R>(
        js: &'a R,
    ) -> Result<Self::Anchor, Error>
       where R: AsRef<JsValue> + 'a;

    // Provided methods
    fn try_ref_from_js_value_as_cast<'a, R>(
        js_value: &'a R,
    ) -> Result<Cast<'a, Self>, Error>
       where R: AsRef<JsValue> + 'a { ... }
    fn try_long_ref_from_js_value_as_cast<'a, R>(
        js: &'a R,
    ) -> Result<Cast<'a, Self>, Error>
       where R: AsRef<JsValue> + 'a { ... }
}

CastFromJs trait is automatically implemented by deriving the CastFromJs derive macro. This trait provides functions for accessing Rust references from the WASM ABI.

Required Methods

fn try_ref_from_js_value<'a, R>(js_value: &'a R) -> Result<Self::Anchor, Error>

where R: AsRef<JsValue> + 'a,

Obtain safe reference from JsValue

fn try_long_ref_from_js_value<'a, R>(js: &'a R) -> Result<Self::Anchor, Error>

where R: AsRef<JsValue> + 'a,

Obtain safe long reference from JsValue

Provided Methods

fn try_ref_from_js_value_as_cast<'a, R>( js_value: &'a R, ) -> Result<Cast<'a, Self>, Error>

where R: AsRef<JsValue> + 'a,

fn try_long_ref_from_js_value_as_cast<'a, R>( js: &'a R, ) -> Result<Cast<'a, Self>, Error>

where R: AsRef<JsValue> + 'a,

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.

Implementors