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Asked: 2026-05-26T10:47:29+00:00

I’m looking for a function in C++ that for swap the contents of a

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I’m looking for a function in C++ that for swap the contents of a map …
that is:
those that were the keys now become the items and those that the items were now the keys.
Can you tell me if there is something about this?

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1 Answer

  1. Editorial Team

    As Geoffroy said, std::map doesn’t allow this behaviour. However, you might want to use a STL-like container Boost.Bimap – bidirectorial map.

    A Bimap is a data structure that represents bidirectional relations between elements of two collections. The container is designed to work as two opposed STL maps. A bimap between a collection X and a collection Y can be viewed as a map from X to Y (this view will be called the left map view) or as a map from Y to X (known as the right map view).

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