No, the function (https://github.com/stevengj/nlopt/blob/496be736b8b249273838b891f4c8ca3669551127/src/algs/auglag/auglag.c#L25 <https://github.com/stevengj/nlopt/blob/496be736b8b249273838b891f4c8ca3669551127/src/algs/auglag/auglag.c#L25>) is not exported.
However, the augmented Lagrangian function is pretty simple to implement yourself if you need it.
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