C++ named requirements: TransformationTrait (since C++11)
A TransformationTrait is a class template that provides a transformation of its template type parameter.
Requirements
- Takes one template type parameter (additional template parameters are optional and allowed)
- The transformed type is a publicly accessible nested type named
type
Standard library
The type modifications and transformations all satisfy TransformationTrait.
The following standard library class templates also satisfy TransformationTrait.
| pub | std::tuple_size<std::tuple>(C++11) | obtains the size of tuple at compile time |
| pub | std::tuple_size<std::array>(C++11) | obtains the size of an array |
| pub | std::tuple_size<std::pair>(C++11) | obtains the size of a pair |
| pub | variant_size variant_size_v(C++17) | obtains the size of the variant's list of alternatives at compile time |