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error_type &assume_error() & noexcept

Narrow contract lvalue reference observer of the stored error. NoValuePolicy::narrow_error_check() is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs unless NoValuePolicy::narrow_error_check() does that.

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

Requires: Always available.

Complexity: Depends on NoValuePolicy::narrow_error_check().

Guarantees: An exception is never thrown.

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

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