Struct neon::handle::Handle[][src]

#[repr(C)]
pub struct Handle<'a, T: Managed + 'a> { /* fields omitted */ }
Expand description

A handle to a JavaScript value that is owned by the JavaScript engine.

Implementations

Safely upcast a handle to a supertype.

This method does not require an execution context because it only copies a handle.

Tests whether this value is an instance of the given type.

Example:
let v: Handle<JsValue> = cx.number(17).upcast();
v.is_a::<JsString, _>(&mut cx); // false
v.is_a::<JsNumber, _>(&mut cx); // true
v.is_a::<JsValue, _>(&mut cx);  // true

Attempts to downcast a handle to another type, which may fail. A failure to downcast does not throw a JavaScript exception, so it’s OK to continue interacting with the JS engine if this method produces an Err result.

Attempts to downcast a handle to another type, raising a JavaScript TypeError exception on failure. This method is a convenient shorthand, equivalent to self.downcast::<U>().or_throw::<C>(cx).

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

The resulting type after dereferencing.

Dereferences the value.

Mutably dereferences the value.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.