Dex.StateTransitionFunc
Description: Reference for Dex.StateTransitionFunc

### Function

# DexStateTransitionFunc

#### Declaration

    gboolean
    (* DexStateTransitionFunc) (
      guint from,
      guint* to,
      gpointer user_data,
      GError** error
    )

#### Description [src]

Callback used to execute a transition edge.

On entry, `to` contains the declared target for the edge being executed. If the callback succeeds and leaves `to` unchanged, the transition completes at that state. If the callback changes `to`, `DexStateMachine` commits the changed state instead. The changed state must be a valid value in the state enum.

#### Parameters

`from`

  Type: `guint`

  The current state.

`to`

  Type: `guint*`

  The target state for the current edge.

  The argument will be modified by the function.

`user_data`

  Type: `gpointer`

  User data provided to `dex_state_machine_new()`.

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

`error`

  Type: `GError **`

  The return location for a recoverable error.

  The argument can be `NULL`.
  If the return location is not `NULL`, then you must initialize it to a `NULL` `GError*`.
  The argument will be left initialized to `NULL` by the function if there are no errors.
  In case of error, the argument will be set to a newly allocated `GError`; the caller will take ownership of the data, and be responsible for freeing it.

#### Return value

Type: `gboolean`

`TRUE` if the transition succeeded; otherwise `FALSE` and `error` is set.