Type Alias JSObjectConvertToTypeCallback

pub type JSObjectConvertToTypeCallback = Option<unsafe extern "C" fn(ctx: JSContextRef, object: JSObjectRef, type_: JSType, exception: *mut JSValueRef) -> *const OpaqueJSValue>;

The callback invoked when converting an object to a particular JavaScript type.

• ctx: The execution context to use.
• object: The JSObjectRef to convert.
• type: A JSType specifying the JavaScript type to convert to.
• exception: A pointer to a JSValueRef in which to return an exception, if any.

Returns the objects’ converted value, or NULL if the object was not converted.

If you named your function ConvertToType, you would declare it like this:

JSValueRef
ConvertToType(JSContextRef ctx, JSObjectRef object, JSType type,
              JSValueRef* exception);

If this function returns false, the conversion request forwards to object’s parent class chain (which includes the default object class).

This function is only invoked when converting an object to number or string. An object converted to boolean is true. An object converted to object is itself.

Aliased Type

pub enum JSObjectConvertToTypeCallback {
    None,
    Some(unsafe extern "C" fn(*const OpaqueJSContext, *mut OpaqueJSValue, JSType, *mut *const OpaqueJSValue) -> *const OpaqueJSValue),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*const OpaqueJSContext, *mut OpaqueJSValue, JSType, *mut *const OpaqueJSValue) -> *const OpaqueJSValue)

Some value of type T.