typedef void (*CBFunc)(GisPlugin *, const gchar *, gpointer);
CBFunc callback = (CBFunc)_callback;
for (int i = 0; i < self->plugins->len; i++) {
typedef void (*CBFunc)(GisPlugin *, const gchar *, gpointer);
CBFunc callback = (CBFunc)_callback;
for (int i = 0; i < self->plugins->len; i++) {