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void unique()
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<p>Remove consecutive duplicate values from this list. </p>
<p>This function supports auto-commit. </p>
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void unique(BinaryPredicate binary_pred)
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<p>Remove consecutive duplicate values from this list. </p>
<p>This function supports auto-commit. </p>
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<p>The compare predicate to dertermine uniqueness. </p>
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