C multiset return key at position

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According to the documentation, the multiset data object contains property ordering.

As a result, for a multiset named, say, ms, it should be clear how to get the set element at a given location I such that 0 = I ms.size ().

I attempted to access these items as ms[i].

The language, however, argues that multiset does not accept subscripts.

How can I access element I in a multiset using syntax?
Jun 27 in C++ by Nicholas
• 5,020 points
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1 answer to this question.

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A set (or multiset) is typically represented as a tree.

As a result, key access is fairly efficient.

It is not possible to gain access using an index.

(Unlike an array, a tree does not provide random access to nodes.)

Of course, there are ingenious combinations (trees with all nodes saved in an array), but not for std::.

set vs std::multiset
answered Jun 27 by Damon
• 4,960 points

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