### Method

# JavaScriptCore Class add_constructor

#### Declaration [src]

    JSCValue*
    jsc_class_add_constructor (
      JSCClass* jsc_class,
      const char* name,
      GCallback callback,
      gpointer user_data,
      GDestroyNotify destroy_notify,
      GType return_type,
      guint n_params,
      ...
    )

#### Description [src]

Add a constructor to `jsc_class`. If `name` is `NULL`, the class name will be used. When <function>new</function> is used with the constructor or `jsc_value_constructor_call()` is called, `callback` is invoked receiving the parameters and `user_data` as the last parameter. When the constructor object is cleared in the `JSCClass` context, `destroy_notify` is called with `user_data` as parameter.

This function creates the constructor, which needs to be added to an object as a property to be able to use it. Use `jsc_context_set_value()` to make the constructor available in the global object.

Note that the value returned by `callback` is adopted by `jsc_class`, and the `GDestroyNotify` passed to `jsc_context_register_class()` is responsible for disposing of it.

This method is not directly available to language bindings.

The implementation of this method is provided by `jsc_class_add_constructorv()` in language bindings

#### Parameters

`name`

  Type: `const char*`

  The constructor name or `NULL`.

  The argument can be `NULL`.
  The data is owned by the caller of the method.
  The value is a NUL terminated UTF-8 string.

`callback`

  Type: `GCallback`

  A `GCallback` to be called to create an instance of `jsc_class`.

`user_data`

  Type: `gpointer`

  User data to pass to `callback`.

  The argument can be `NULL`.
  The data is owned by the caller of the method.

`destroy_notify`

  Type: `GDestroyNotify`

  Destroy notifier for `user_data`.

  The argument can be `NULL`.

`return_type`

  Type: `GType`

  The `GType` of the constructor return value.

`n_params`

  Type: `guint`

  The number of parameter types to follow or 0 if constructor doesn’t receive parameters.

`...`

  Type: ``

  A list of `GType`s, one for each parameter.

#### Return value

Type: `JSCValue`

A `JSCValue` representing the class constructor.

The caller of the method takes ownership of the data, and is responsible for freeing it.