# `compound_data_type` Interface

A data-policy indicating that an associative container has multiple mapping levels.

1. `data_type.hpp`
2. Template parameters.
3. Public Types and Constants:
   1. General definitions.

## Template parameters.

Parameter | Description | Default Value

    Cntnr

(Associative) container type to which every key in the container maps.

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## General definitions.

Type | Definition | Description

    cntnr

    Cntnr

The type of container which is the actual data type.