Traits class

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In computer programming, a traits class is a class template template used to associate information or behaviour to a compile-time entity, typically a data type or a constant, without modifying the existing entity. In the C++ programming language, this is normally achieved by defining a primary class template, and creating explicit or partial specializations for the relevant types.

Usage

It is used in Standard Template Library and the C++ standard library to support generic container classes. The technique is used extensively in the Boost TypeTraits library.

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