Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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const error_type &error() const &

Wide contract const lvalue reference observer of the stored error. NoValuePolicy::wide_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 if NoValuePolicy::wide_error_check() returns.

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

Requires: Always available.

Complexity: Depends on NoValuePolicy::wide_error_check().

Guarantees: None.

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

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