Sentinel type for a specializable variable‐template customization point with no usable default.
Synopsis
Declared in <mp‐units/utility/unspecified.h>
struct unspecified_t;Description
A variable template cannot be `= delete`d the way a function can, so a customization point that must be specialized before use defaults to an object of this type, and a specialization replaces it with a real value. #specified reports whether that has happened.
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