mp_units::utility::unspecified_t

Declared in <mp‐units/utility/unspecified.h>

A variable template cannot be = delete`d the way a function can, so a customization point that must be specialized before use defaults to `unspecified, and a specialization replaces it with a real value. specified reports whether that has happened. This is public authoring vocabulary shared by the library's own customization points and by higher‐level tools, hence it lives in the mp_units::utility namespace.

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