Gio.AsyncResult.legacy_propagate_error

### Method

# Gio AsyncResultlegacy_propagate_error

since: 2.34

#### Declaration [src]

    gboolean
    g_async_result_legacy_propagate_error (
      GAsyncResult* res
      GError** error
    )

#### Description [src]

If `res` is a `GSimpleAsyncResult`, this is equivalent to `g_simple_async_result_propagate_error()`. Otherwise it returns `FALSE`.

This can be used for legacy error handling in async `*_finish()` wrapper functions that traditionally handled `GSimpleAsyncResult` error returns themselves rather than calling into the virtual method. This should not be used in new code; `GAsyncResult` errors that are set by virtual methods should also be extracted by virtual methods, to enable subclasses to chain up correctly.

Available since: 2.34

#### Return value

Type: `gboolean`

`TRUE` if `error` is has been filled in with an error from `res`, `FALSE` if not.