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value_type &&assume_value() && noexcept

Narrow contract rvalue reference observer of any value present. NoValuePolicy::narrow_value_check() is first invoked, then the reference to the value is returned. The convention is that hard undefined behaviour occurs if no value is actually present, however NoValuePolicy::narrow_value_check() can do something to avoid that.

Note that if value_type is void, only a const overload returning void is present.

Requires: Always available.

Complexity: Depends on NoValuePolicy::narrow_value_check().

Guarantees: An exception is never thrown.

Last revised: February 12, 2019 at 16:36:24 UTC

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