### Method

# JavaScriptCore Value object_define_property_accessor

#### Declaration [src]

    void
    jsc_value_object_define_property_accessor (
      JSCValue* value,
      const char* property_name,
      JSCValuePropertyFlags flags,
      GType property_type,
      GCallback getter,
      GCallback setter,
      gpointer user_data,
      GDestroyNotify destroy_notify
    )

#### Description [src]

Define or modify a property with `property_name` in object referenced by `value`. When the property value needs to be getted or set, `getter` and `setter` callbacks will be called. When the property is cleared in the `JSCClass` context, `destroy_notify` is called with `user_data` as parameter. This is equivalent to JavaScript Object.defineProperty() when used with an accessor descriptor.

Note that the value returned by `getter` must be fully transferred. In case of boxed types, you could use `G_TYPE_POINTER` instead of the actual boxed `GType` to ensure that the instance owned by `JSCClass` is used. If you really want to return a new copy of the boxed type, use #JSC_TYPE_VALUE and return a `JSCValue` created with `jsc_value_new_object()` that receives the copy as instance parameter.

Note that `getter` and `setter` are called as functions and not methods, so they don’t receive an instance as first parameter. Use `jsc_class_add_property()` if you want to add property accessor invoked as a method.

#### Parameters

`property_name` | `const char*`
| The name of the property to define.
| The data is owned by the caller of the function.
| The value is a NUL terminated UTF-8 string.
`flags` | `JSCValuePropertyFlags`
| `JSCValuePropertyFlags`.
`property_type` | `GType`
| The `GType` of the property.
`getter` | `GCallback`
| A `GCallback` to be called to get the property value.
| The argument can be `NULL`.
`setter` | `GCallback`
| A `GCallback` to be called to set the property value.
| The argument can be `NULL`.
`user_data` | `gpointer`
| User data to pass to `getter` and `setter`.
| The argument can be `NULL`.
| The data is owned by the caller of the function.
`destroy_notify` | `GDestroyNotify`
| Destroy notifier for `user_data`.
| The argument can be `NULL`.