wrapT

WrapT is a generic term used in programming to denote a wrapper type that encapsulates a value of some type T and optionally carries additional metadata or behavior. The exact form of wrapT varies by language and project, but the common idea is to lift a raw value into a container that can participate in higher‑level abstractions, pipelines, or effectful computations.

A wrapT typically provides a minimal set of core capabilities. These may include:

- A constructor or factory to create a wrapped value

- An unwrap or value accessor to retrieve the inner value

- Functional operators such as map (to apply a function to the inner value) and, in more advanced variants, flatMap or bind (to chain computations)

- Optional metadata or tagging that accompanies the value, used for provenance, permissions, or other context

In practice, wrapT can be used to implement a variety of patterns. It can enable safe composition by enforcing invariants at the wrapper level, tag values for runtime distinctions, or prepare values for serialization, logging, or effect systems. Some codebases employ wrapT to simulate monadic or applicative behavior, while others use it as a lightweight carrier for values with extra annotations.

Example (pseudo-code):

wrapT<T> w = wrapT(5)

wrapT<int> w2 = w.map(x -> x + 1)

int y = w2.unwrap()

Because wrapT is not a standardized library term, its API and semantics are highly context-dependent. See also wrapper, box, newtype, Functor, Monad.