Gtk.BoolFilter.get_expression

### Method

# Gtk BoolFilterget_expression

#### Declaration [src]

    GtkExpression*
    gtk_bool_filter_get_expression (
      GtkBoolFilter* self
    )

#### Description [src]

Gets the expression that the filter uses to evaluate if an item should be filtered.

Gets property | `Gtk.BoolFilter:expression`

#### Return value

Returns: | `GtkExpression`
| A `GtkExpression`
| The data is owned by the instance.
| The return value can be `NULL`.