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bool operator==(const self &m2) const
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<p>Container content equality compare operator. </p>
<p>This function does not rely on key order. Two sets A and B are equal if and only if for each and every key K having n occurrences in A, K has n occurrences in B, and for each and every key K` having N occurrences in B, K` has n occurrences in A. </p>
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<p>The container to compare against. </p>
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<p>Returns true if the two containers are equal, false otherwise. </p>
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